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Publisher: Elsevier   (Total: 3042 journals)

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Showing 1 - 200 of 3042 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 19, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 16, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 81, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 23, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 27, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 4)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 5, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 328, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 25, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription  
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 205, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 9, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (Followers: 1)
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 22, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 5, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 4)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 3)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 4, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 2)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 5, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 4, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 3)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 5)
Additive Manufacturing     Hybrid Journal   (Followers: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 124, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 9, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 25, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 6, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 21, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 16, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 3, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 25, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24, SJR: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 8, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 16, SJR: 0.223, h-index: 22)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 4)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Ecological Research     Full-text available via subscription   (Followers: 39, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 25, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 40, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 45, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 12)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 20, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 24)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 34, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 3, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 4)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 5, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 22)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 4)
Advances in Oncobiology     Full-text available via subscription   (Followers: 3)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 7, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 21, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 13)
Advances in Pharmacology     Full-text available via subscription   (Followers: 15, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 7, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 8)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 58)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 2, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 339, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 8)
Advances in Surgery     Full-text available via subscription   (Followers: 6, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 29, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 15)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 43, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 5, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 308, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 5, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 7, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 422, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 30, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 38, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 1)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 50, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 5, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 10, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 6)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access  
Algal Research     Partially Free   (Followers: 8, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 5, SJR: 0.776, h-index: 35)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 6, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 46, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 5)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 3)
American Heart J.     Hybrid Journal   (Followers: 47, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 44, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 34, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 6, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 15, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 30, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 24, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 32, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 44, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 179, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 54, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 2)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 23, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 23, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 21, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 33, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 5)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 53, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 5)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 2, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 160, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 8, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Anesthésie & Réanimation     Full-text available via subscription  
Anesthesiology Clinics     Full-text available via subscription   (Followers: 21, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 153, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)
Animal Reproduction Science     Hybrid Journal   (Followers: 5, SJR: 0.711, h-index: 78)
Annales d'Endocrinologie     Full-text available via subscription   (SJR: 0.394, h-index: 30)
Annales d'Urologie     Full-text available via subscription  
Annales de Cardiologie et d'Angéiologie     Full-text available via subscription   (SJR: 0.177, h-index: 13)
Annales de Chirurgie de la Main et du Membre Supérieur     Full-text available via subscription  
Annales de Chirurgie Plastique Esthétique     Full-text available via subscription   (Followers: 2, SJR: 0.354, h-index: 22)
Annales de Chirurgie Vasculaire     Full-text available via subscription   (Followers: 1)

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Journal Cover Acta Ecologica Sinica
  [SJR: 0.172]   [H-I: 29]   [8 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1872-2032
   Published by Elsevier Homepage  [3042 journals]
  • Morphological variability and allometric relationships of the herb Panax
           notoginseng in Yunnan, China

    • Authors: Ji Zhang; Yan-Li Zhao; Hang Jin; Jin-Yu Zhang; Yuan-Zhong Wang
      Pages: 65 - 69
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Ji Zhang, Yan-Li Zhao, Hang Jin, Jin-Yu Zhang, Yuan-Zhong Wang
      A plant's morphology changes throughout its ontogeny. Investigating the allometric relationships between different morphological traits could provide useful information for cultivation of medicinal plants. Here we collected 698 individuals of Panax notoginseng for allometric analysis from seven populations cultivated in Yunnan, Southwest China. The slopes and intercepts of the allometric relationships were estimated by Standardized Major Axis regression. Significant differences (p<0.05) were found in each morphological variable considered among populations. Allometric analysis showed that all of the log-log relationships had different slopes or shared a common slope but differed in intercept (p<0.001). The morphological traits showed flexible allometric relationships. However, the root biomass that considered as a target trait showed the least allometric variability (slope=1.068–1.378) when compared to other variables. This could be because of the hundreds of years of cultivation and artificial selection.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.008
       
  • Aspects and altitudes modify the requirement of disturbance in oak
           (Quercus leucotrichophora A. Camus) belt of Garhwal Himalaya

    • Authors: Sunil Prasad; Vikaspal Singh; DS Chauhan
      Pages: 70 - 74
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Sunil Prasad, Vikaspal Singh, DS Chauhan
      Present study measures the impact of forest disturbance on population structure and regeneration status of a Himalayan banj oak (Qsuercus leucotrichophora A. Camus) forest at different aspects and altitudes. The whole study was carried out by placing 300 systematically selected sample plots in banj oak forest. The study revealed that moderately disturbed forest patches were present in all elevation ranges and both north and south facing aspects whereas most of the highly disturbed patches were situated near middle and lower stretches of forests or close to habitations. Density of primary diameter class (5–15cm) was recorded highest in moderately disturbed zone in upper elevation ranges and north facing aspect and ‘fair’ category of regeneration was most frequent in all elevation ranges and aspects. The paper concludes a positive effect of mid-level disturbance on plant community for better regeneration and study recommends a minimum resource extraction and silvicultural practices in banj-oak belt of Himalaya for a minimum canopy opening which not only be able to provide biomass to local communities for their daily needs but also would be able to maintain and improve forest health.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.009
       
  • Effects of shell morphological traits on the weight trait of the orange
           strain of the Manila clam

    • Authors: Zhong-ming Huo; Yu-an Wu; Zhi-ying Gao; Guan-nan Chu; Xi-wu Yan; Feng Yang; Guo-fan Zhang
      Pages: 75 - 78
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Zhong-ming Huo, Yu-an Wu, Zhi-ying Gao, Guan-nan Chu, Xi-wu Yan, Feng Yang, Guo-fan Zhang
      A new strain of Manila clam with orange shell color was produced after selection within a full-sib family for two generations. In the present study, the shell length, height, and width, and the live body weight of the orange strain were measured, and their correlation coefficients were calculated. The shell morphological traits were used as independent variables, and the live body weight was used as the dependent variable for calculating the path coefficients, correlation index, and determination coefficients. The results showed that the correlation coefficients between each shell morphological trait and the live body weight were all highly significant (P <0.01). The correlation indices (R 2) of morphological traits against the live body weight of clams were larger than 0.85, indicating that the morphology traits were the main factors affecting the body weight. Multiple regression equations were obtained to estimate shell length X 1 (cm), shell height X 2 (cm), and shell width X 3 (cm) against live body weight Y (g): Y =−2.62+0.34 X 1 +0.145 X 2, (X 1 <0.05, X 2 <0.05). The results suggest that the shell length could be used as the main trait for selective breeding and could indirectly make a large improvement in the weight trait.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.007
       
  • Dynamic assessment of the value of vegetation carbon fixation and oxygen
           release services in Qinghai Lake basin

    • Authors: Tao Zhang; Guangchao Cao; Shengkui Cao; Xiaoge Zhang; Jing Zhang; Guangzhao Han
      Pages: 79 - 84
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Tao Zhang, Guangchao Cao, Shengkui Cao, Xiaoge Zhang, Jing Zhang, Guangzhao Han
      Studies on ecosystem service function have an important significance for analyzing and understanding global warming. With the introduction of geographic information system (GIS) and remote sensing (RS) technologies for the evaluation of ecosystem service function, the scope for analysis has been widening. Increasing number of researchers use these technologies to quantify the value of ecosystem service functions and reveal their spatial-temporal variability. By using the data for the interpretation of five RS images and net primary productivity (NPP) in Qinghai Lake basin, we assessed the value of vegetation carbon fixation and oxygen release services and revealed their dynamic variation in this basin. The result suggested that the average values of vegetation carbon fixation and oxygen release services in Qinghai Lake basin between 1987 and 2010 were spatially distributed in a ring shape around the Qinghai Lake and decreased from southeastern to the north and northwestern regions; the northwestern areas had the lowest value. The vegetation carbon fixation value between 1987 and 2010 was on an average 28.87×108 yuan/a in Qinghai Lake basin, whereas the oxygen release value was 64.41×108 yuan/a. Alpine meadow ecosystem showed the highest value of vegetation carbon fixation and oxygen release services function in Qinghai Lake basin, with average values of 18.28×108 yuan/a and 40.79×108 yuan/a, respectively, followed by those of temperate steppe and sparse vegetation. The vegetation carbon fixation and oxygen release values in Qinghai Lake basin gradually increased from 1987 to 2010, with the maximum value in 2010. By the end of 2010, the values increased by 7.19×108 yuan and 16.04×108 yuan, respectively. The values slightly decreased in barren land, lakeside marsh, river valley swamp, and sandy areas, but increased to different degrees in other ecosystems. Among them, the largest increase was noted in alpine meadow (4.38×108 yuan and 9.78×108 yuan, respectively), followed by those in temperate steppe with increased values of 1.12×108 yuan and 2.49×108 yuan, respectively.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.005
       
  • Effects of simulated warming on soil ammonia-oxidizing bacteria and
           archaea communities in an alpine forest of western Sichuan, China

    • Authors: Li Zhang; Fuzhong Wu; Zhenfeng Xu; Bo Tan; Ao Wang; Wanqin Yang
      Pages: 85 - 90
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Li Zhang, Fuzhong Wu, Zhenfeng Xu, Bo Tan, Ao Wang, Wanqin Yang
      Ongoing climate change, characterized by winter warming, snow cover decline and extreme weather events, is changing terrestrial ecosystem processes in high altitude and latitude regions. Winter soil processes could be particularly sensitive to climate change. In fact, winter warming and snow cover decline are interdependent in cold biomes, and have a synergistic effect on soil processes. Soil microorganisms not only play crucial roles in material cycling and energy flow, but also act as sensitive bio-indicators of climate change. However, little information is available on the effect of winter warming on forest soil ammonia-oxidizing bacteria (AOB) and archaea (AOA). The alpine and subalpine forest ecosystems on the eastern Tibet Plateau have important roles in conserving soil, holding water, and maintaining biodiversity. To understand the changes in AOB and AOA communities under climate change scenarios, an altitudinal gradient experiment in combination with soil column transplanting was conducted at the Long-term Research Station of Alpine Forest Ecosystems, which is situated in the Bipeng Valley of Lixian County, Sichuan, China. Thirty intact soil columns under an alpine forest at an altitude of 3582m were transplanted and incubated at 3298m and 3023m forest sites, respectively. Compared with the 3582m, we expected air temperature increases of 2°C and 4°C at the 3298m and 3023m, respectively. However, the temperatures in the soil organic layer (OL) and mineral soil layer (ML) increased by 0.27°C and 0.13°C, respectively, at 3023m and −0.36°C and −0.35°C at 3298m. Based on a previous study and with simultaneous monitoring of soil temperature, the abundances of AOB and AOA communities in both the OL and ML were measured by qPCR in December 2010 (i.e., the onset of the frozen soil period) and March 2011 (i.e., the late frozen soil period). The soil columns incubated at 3023m had relatively higher AOB abundances and lower AOA/AOB ratios than those at 3298m, while higher AOA abundances and AOA/AOB ratios were observed at 3298m. The abundance of the microbial community at the late frozen period was higher than that at the onset of frozen soil, and the changes in microbial community abundance at the late frozen period were more substantial. Furthermore, the nitrate nitrogen (N) concentrations in both the OL and ML were significantly higher than ammonia N concentrations, implying that soil nitrate N is the primary component of the inorganic N pool in the alpine forest ecosystem. Additionally, the responses of AOA and AOB in the soil OL to soil column transplanting were more sensitive than the responses of those in ML. In conclusion, climate warming alters the abundance of the ammonia-oxidizing microbial community in the alpine forest ecosystem, which, in turn, might affect N cycling.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.004
       
  • Floral traits and mating system of Hibiscus trionum (Malvaceae)

    • Authors: Qun Li; Cheng-Jiang Ruan; Jaime A. Teixeira da Silva
      Pages: 91 - 96
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Qun Li, Cheng-Jiang Ruan, Jaime A. Teixeira da Silva
      Variations in floral traits and floral structures influence plant mating systems. Hibiscus trionum produces large, showy flowers typical of an outcrossing species, yet flowers are autonomously self-pollinated. In this study, we measured floral morphology, breeding system and outcrossing rate estimated by ISSR markers. Results indicate that two types of flowers were observed in H. trionum, and the type I with bigger petals appears to be much more visible to pollinators, demonstrated by than type II flowers with smaller petals. The flowers with hand pollination were closed 1h earlier than intact flowers, whether they were type I or II. The relationship between the amount of pollen deposited on the stigma and the number of seeds per capsule was highly significant, and 80 or more pollens per flower can make the mean number of seeds (mean=37) in H. trionum. Delayed selfing in H. trionum did not provide a large contribution to seed production, since reproductive assurance were only 0.025. However, successful reproduction of 72.5% flowers in the absence of pollinators suggested that selfing provides reproductive assurance during seasons, in which pollinators were limiting. The multilocus outcrossing rates in different populations varied from 0.982 to 1.200, with a mean of 1.116. Our data provide an empirical demonstration of a predominantly outcrossing species with potential delayed selfing when pollinators are absent or scarce.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.011
       
  • Determination of food sources and trophic position in Malaysian tropical
           highland streams using carbon and nitrogen stable isotopes

    • Authors: Dhiya Shafiqah Ridzuan; Che Salmah Md. Rawi; Suhaila Abdul Hamid; Salman Abdo Al-Shami
      Pages: 97 - 104
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Dhiya Shafiqah Ridzuan, Che Salmah Md. Rawi, Suhaila Abdul Hamid, Salman Abdo Al-Shami
      Stable isotope analysis has been extensively used as an effective tool in determination of trophic relationship in ecosystems. In freshwater ecosystem, aquatic invertebrates represent main component of a river food web. This study was carried out to determine potential food sources of freshwater organism together with pattern of trophic position along the river food web. In this study, rivers of Belum-Temengor Forest Complex (BTFC) has been selected as sampling site as it is a pristine area that contains high diversity and abundance of organisms and can be a benchmark for other rivers in Malaysia. Stable isotope ratios of carbon (δ 13C) and nitrogen (δ 15N) were applied to estimate trophic position and food web paradigm. Analysis of stable isotopes based on organic material collected from the study area revealed that the highest δ 13C value was reported from filamentous algae (−22.68±0.1260/00) and the lowest δ 13C was in allocthonous leaf packs (−31.58±0.1870/00). Meanwhile the highest δ 15N value was in fish (8.45±0.1770/00) and the lowest value of δ 15N was in autochthonous aquatic macrophyte (2.00±1.2340/00). Based on the δ 15N results, there are three trophic levels in the study river and it is suggested that the trophic chain begins with organic matter followed by group of insects and ends with fish (organic matter<insects<fish).

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.10.002
       
  • Ecological survey of two Calomyscidae species; Goodwin's brush-tailed
           mouse and Hotson's brush-tailed mouse (Rodentia) in the eastern parts of
           Iran

    • Authors: Kordiyeh Hamidi; Jamshid Darvish; Maryam M. Matin
      Pages: 105 - 114
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Kordiyeh Hamidi, Jamshid Darvish, Maryam M. Matin
      Calomyscus elburzensis and C. hotsoni are two species of the rodents family Calomyscidae which are distributed mainly in Iran. Herein, we evaluated the habitat and ecological differences of these two brush-tailed mice in order to test the credibility of a hypothesis stating that species from habitats with different climates and vegetation show greater intraspecific differentiation than those from areas with more similar climates and vegetation. This study was carried out in four rocky regions in Iran between 2013 and 2015. Totally 52 brush-tailed mice were captured from Kopet-Dag, Khaje-Morad, Ark, and Shadan and Olang during the field studies. Maximum parsimony analysis inferred from mitochondrial DNA sequences (Cytb) was used for species identification, and also comparison of mean Kimura 2-paramater distances was performed. According to the molecular studies, specimens from the first two regions were assigned to C. elburzensis and samples from Ark, and Shadan and Olang belonged to C. hotsoni. The mean distances within all examined Iranian samples of both C. elburzensis and C. hotsoni were 2.3% and 0.9%, respectively. Based on our field studies, C. elburzensis were captured either from “cold mountainous” climate zone with Juniperus excelsa as main vegetation cover or from “Mediterranean” in which Pistacia atlantica is predominant vegetation. C. hotsoni were found in “hot dry desert” and “cold semi-desert” regions both characterized by Ephedra sp. and Avena sativa vegetation cover. Dog rose seeds were the main food of C. elburzensis in Kopet-Dag, whereas brush-tailed mice in the other three regions fed mainly on Mount Atlas pistache fruits. C. elburzensis inhabited concealed rock crevices, but C. hotsoni were found living in burrows which were digged in the soft soils. Individuals of C. hotsoni showed more calm behavior as compared with C. elburzensis. Meriones persicus and Cricetulus migratorius (Rodentia) as well as Ochotona rufescence (Lagomorpha) were the most abundant small mammals encountered with C. elburzensis, while M. persicus was the most successful rodent with sympatric colonies with C. hotsoni. In conclusion, in accordance with the greater genetic distances observed in C. elburzensis populations as compared with C. hotsoni, more significant differences in the habitat structure were also found for the first species in different parts of its distribution range.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.010
       
  • Soil microorganisms nitrogen transformation test for abamectin 3.6g/L EC
           (w/v) in loamy sand soil

    • Authors: Nageswara Rao Tentu; Parvatamma Botsa; Manohara Naidu Tentu; Karri Apparao
      Pages: 115 - 119
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Nageswara Rao Tentu, Parvatamma Botsa, Manohara Naidu Tentu, Karri Apparao
      The present study was conducted to determine the nitrogen transformation test of abamectin 3.6g/L EC. This study was conducted as per OECD Guidelines for the Testing of Chemicals OECD 216. The test item abamectin 3.6g/L emulsifiable concentrate (EC) was applied in a loamy sand soil and incubated over a period of 28days for nitrogen transformation test at concentrations of 3.2μL/kg soil dry weight and 16μL/kg soil dry weight. The concentrations tested were based on one and five times the maximum recommended field application rates of 1200mL/ha and 6000mL/ha of abamectin 3.6g/L EC, respectively. The deviation in soil nitrate content determined at 28days after application of the test item to soil compared to the control was 0.14% and −9.25% for the single and five times test concentrations, respectively. There is no significant variation between the treatment groups and control sample. The rate of nitrate formation between 14 and 28days after application of the test item to soil deviate from control by 10.41% and 13.74% for 3.2 and 16μL/kg soil dry weight, respectively. Deviations in nitrate levels and nitrate formation rates in soil treated with up to and including 16μL/kg of test item/kg soil dry weight were <25%, compared to control indicating no significant effect occurred in nitrogen transformation.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2017.02.001
       
  • Histopathological changes and transcriptional alterations of three
           coagulation factors in zebrafish (Danio rerio) following short-term
           exposure to MC-LR

    • Authors: Lili Wei; Yi Liu; Zirui Wang; Jiming Ruan; Huadong Wu; Qiwang Zhong
      Pages: 120 - 124
      Abstract: Publication date: April 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 2
      Author(s): Lili Wei, Yi Liu, Zirui Wang, Jiming Ruan, Huadong Wu, Qiwang Zhong
      Microcystin-LR (MC-LR) is the most common hepatotoxic cyanotoxin produced primarily by Microcystis aeruginosa. Although deaths from microcystin toxication have widely been attributed to hypovolemic shock due to hepatic interstitial hemorrhage, so far, information on coagulation factors of MC-LR has been rare. In our present study, the effects of MC-LR on the coagulation factors expression and pathological changes in zebrafish were investigated. Adult zebrafish were injected intraperitoneally with 200μg/kg MC-LR and newly hatched larvae were placed in glass wares containing 200μg MC-LR/L, liver and whole larvae were collected after exposure for 12h, 24h, 48h and 96h, respectively. mRNA levels of coagulation factor IX (FIX), coagulation factor VII (FVII) and coagulation factor VIIi (FVIIi) in liver of adult fish and total zebrafish larvae were analyzed using quantitative real-time PCR. Significant depression of FIX and FVII were observed in adult zebrafish at different time point, and FVIIi were also significantly decreased except for 12h post-injection. In addition, the histopathological changes in adult zebrafish liver were observed, and the severe hepatic injuries were found at 96h. The pathological changes further explained the transcriptional results. The transcriptions of FVII were significantly depressed throughout the entire experiment in zebrafish larvae, and the FIX only significantly depressed after exposure for 48 and 96h, however, FVIIi just was significantly reduced after 12h and 24h stimulation. Whatever the mechanism, the effects of MC-LR on the transcription of these coagulation factors might explain the intrahepatic hemorrhage in liver after exposure to MC-LR, and which would provide new information to elucidate the hepatotoxicity of MC-LR.

      PubDate: 2017-03-13T03:46:09Z
      DOI: 10.1016/j.chnaes.2016.12.006
       
  • Study on the effects of arsenic pollution on the communities of
           macro-invertebrate in Xieshui River

    • Authors: Shiyun Chi; Juxiang Hu; Jinxiu Zheng; Fangyong Dong
      Pages: 1 - 9
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Shiyun Chi, Juxiang Hu, Jinxiu Zheng, Fangyong Dong
      In 2006 and 2007, five sampling stations were set up in Xieshui River and its tributaries to study the macro-invertebrate communities, and measure physicochemical parameters and contents of different forms of arsenic. A comparative analysis and multivariate statistical methods were used to explore the effects of arsenic pollution on the macro-invertebrate communities. In this study, sixty species were identified, including 39 aquatic insects, 10 mollusks, 5 oligochaetes, 1 crustacean, and 5 others. Results of the comparative analysis indicated that the macro-invertebrate communities at the station with serious arsenic pollution tended to be simple and showed a significant decreasing in density, biomass, and biodiversity in comparison with the other stations. Arsenic pollution also had a major effect on the dominant species and groups. For instance, EPT taxa disappeared at the station with serious arsenic pollution, and chironomids that belong to the genus Cardiocladius were very tolerant to high concentrations of arsenic. Results of the functional feeding groups (FFGs) analysis indicated that the predators were more tolerant to arsenic pollution, while the scrapers, filterers, and collectors were relatively sensitive to arsenic pollution. Results of a non-metric multidimensional scaling (nMDS) analysis showed that when the concentration of inorganic arsenic decreased to the range between the criteria continuous concentration (CCC) and the criteria maximum concentration (CMC), the effects of inorganic arsenic on the macro-invertebrate communities seemed to be insignificant. Results of a BVSTEP (Bio-Env Step-Wise Procedure) analysis showed that water temperature, rotifer density, trivalent arsenic, pentavalent arsenic, and total inorganic arsenic greatly influenced species appearance, while rotifer density and various forms of arsenic had a considerable impact on the species composition.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.09.003
       
  • Effect of stand age on soil microbial community structure in wolfberry
           (Lycium barbarum L.) fields

    • Authors: Junhua Zhang; Ming Li; Guoqi Zheng
      Pages: 10 - 17
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Junhua Zhang, Ming Li, Guoqi Zheng
      Soil physicochemical properties and microbes are essential in terrestrial ecosystems through their role in cycling mineral compounds and decomposing organic matter. This study examined the effect of stand age on soil physicochemical properties and microbial community structure in wolfberry (Lycium barbarum L.) fields, in order to reveal the mechanism of soil degradation due to long-term stand of L. barbarum. The objective of the study was achieved by phospholipid fatty acid (PLFA) biomarker analysis of soil samples from L. barbarum fields in Zhongning County, Ningxia Province—the origin of L. barbarum. Five stand ages of L. barbarum were selected, <1, 3, 6, 9, and 12years (three plots each). The results showed that soil bulk density increased slightly with increasing stand age, while no clear trend was observed in soil pH or total salinity. As the stand age increased, soil organic matter and nutrients first increased before decreasing, with the highest levels being found in year 9. There was an amazing variety of PLFA biomarkers in soil samples at different stand ages. The average concentrations of total, bacterial, fungal, and actinomycete PLFAs in the surface soil initially decreased and then increased, before decreasing with the stand age in summer. The PLFA concentrations of major microbial groups were highest in year 9, with the total PLFA concentrations being 32.97% and 10.67% higher than those in years <1 and 12, respectively. Higher microbial PLFA concentrations were detected in summer relative to autumn and in the surface relative to the subsurface soil. The highest ratios of Gram-positive to Gram-negative bacterial (G−/G+) and fungal to bacterial (F/B) PLFAs were obtained in year 6, on average 76.09% higher than those at the other four stand ages. The soil environment was most stable in year 6, with no differences between other stand ages. Therefore, soil microbial community structure was strongly influenced by the stand age in year 6 only. The effect of stand age on soil G−/G+ and microbial community structure varied with season and depth; there was little effect for F/B in the 20–40cm soil layer. Principal component analysis revealed no correlations between microbial PLFA concentrations and total salinity in the soil; negative correlations were noted between soil pH and F/B in summer (P <0.01), as well as between soil pH and fungal PLFA in autumn (P <0.05). Moreover, microbial PLFA concentrations were correlated with soil organic matter (mean R =0.7725), total nitrogen (mean R =0.8296), total phosphorus (mean R =0.8175), available nitrogen (mean R =0.7458), and available phosphorus (mean R =0.7795) (P< 0.01). On the whole, the soil ecosystem was most stable in year 6, while soil organic matter, nutrients, and microbial PLFA concentrations were maximal in year 9; thereafter, soil fertility indices and microbial concentrations decreased and soil quality declined gradually as the stand age increased. Therefore, farmers should reduce the application rate of fertilizers, especially compound or mixed fertilizers, in L. barbarum fields; organic or bacterial manure can be applied increasingly to improve the soil environment and prolong the economic life of L. barbarum.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.12.003
       
  • Resistance characteristics of Cedrus deodara and Sabina chinensis to heavy
           metal accumulation under different atmospheric conditions

    • Authors: Ruirui Zhao; Cong Shi; Meili Zhou; Guoping Chen; Zhangying Gao; Fuchen Shi
      Pages: 18 - 22
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Ruirui Zhao, Cong Shi, Meili Zhou, Guoping Chen, Zhangying Gao, Fuchen Shi
      Cedrus deodara and Sabina chinensis are widely planted in North China. The needles of C. deodara and S. chinensis were sampled in the urban, suburban, and rural districts of Tianjin where the atmospheric conditions are significantly different according to the environmental monitoring results. The Cu, Mn, Zn, and Pb concentrations in the samples were examined via ICP. The resistance indexes, and the malonic aldehyde (MDA), soluble sugar, and free proline levels were also determined. The Pearson coefficients between the resistance indexes and the heavy metal contents were analyzed to compare the two plants abilities to accumulate heavy metal and their resistance characteristics. The results indicated that the heavy metal concentrations had the following significant trend: urban areas>suburban areas>rural areas. In urban areas, the Mn, Zn, and Pb concentrations in C. deodara were as high as 2024.77mg·kg−1, 2397.07mg·kg−1, and 130.07mg·kg−1, significantly higher than in S. chinensis. The Mn, Zn, and Pb concentrations in C. deodara were extremely significantly positively correlated (P <0.01), but no significant correlations were noted in S. chinensis. The MDA, soluble sugar, and free proline concentrations in C. deodara increased as the heavy metal contents rose along the urban–rural gradient, and were positively correlated with the plant heavy metal contents. They were much higher than the contents in S. chinensis where no differences were noted among the sampling sites. In conclusion, the heavy metal resistance methods used by C. deodara and S. chinensis are different. C. deodara could absorb and accumulate many heavy metals, mainly through increased physiological resistance to stress. In contrast, S. chinensis resistance relied on avoiding contact with the metals and by reducing absorption. These differences are associated with the biological characteristics of C. deodara and S. chinensis, and are closely connected with their coniferous and morphological differences.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.12.001
       
  • Urban ecological corridors construction: A review

    • Authors: Jian Peng; Huijuan Zhao; Yanxu Liu
      Pages: 23 - 30
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Jian Peng, Huijuan Zhao, Yanxu Liu
      An ecological corridor, with both ecological and cultural functions, is a symbol of urban ecological or green civilization, and has therefore become one of the major topics in the fields of landscape ecology, urban ecology, and ecological planning. On the one hand, along with the prominent contradiction between regional ecological protection and economic development, as well as between the growing ecological demands of urban residents and the destruction of natural ecosystems, the construction of urban ecological corridors is very challenging. On the other hand, with contemporary urbanization and ecological civilization development, the standards and requirements for the construction of urban ecological corridors are set higher and higher. Constructing an urban ecological corridor is therefore particularly important, and must adopt a spatial approach that balances the relationship between ecological protection and economic development. In this study, the classification of urban ecological corridors was firstly conducted according to the structural or functional differences. Secondly, research progress on the construction of urban ecological corridors was systematically summarized and the main inadequacies were indicated. Following the analysis of the main methods employed in the construction of urban ecological corridors, existing methods were classified into three kinds, i.e. qualitative analysis, quantitative analysis, and spatial analysis. In addition, the advantages and disadvantages of the methods of subjective judgment, suitability and sensitivity analysis, network analysis, and minimum cost path analysis were compared. To provide theoretical support for the construction and management of urban ecological corridors, four key research directions were also pointed out, i.e. the identification of key nodes of urban ecological corridor, the determination of the width of urban ecological corridor, the measurement of integrated effect of urban ecological corridor, and the multi-scale integration of urban ecological corridor. The present study will aid in accelerating and improving the process of ecological corridors construction in China's new-type urbanization.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.12.002
       
  • Effects of elevated atmospheric O3 concentrations on early and late leaf
           growth and elemental contents of Acer truncatum Bung under mild drought

    • Authors: Li Li; Xiaoke Wang; Junfeng Niu; Jian Cui; Qianqian Zhang; Wuxing Wan; Bojie Liu
      Pages: 31 - 34
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Li Li, Xiaoke Wang, Junfeng Niu, Jian Cui, Qianqian Zhang, Wuxing Wan, Bojie Liu
      To investigate the possible interactive effects of elevated atmospheric ozone (O3) concentrations and periodic drought stress on physiology of Shantung maple (Acer truncatum Bung), an experiment was conducted from the growth season of 2012 to 2013 with open-top chambers (OTCs) in Changping district, a suburb of Beijing, China. Four treatments were administered with three replications in twelve OTCs which were NN (well watered+ambient air), NO (well watered+add 100nll−1 O3 above ambient air), DN (drought stress+ambient air) and DO (drought stress+add 100nll−1 O3 above ambient air). Leaf area (LA), leaf mass per area (LMA), individual leaf weight (ILW), carbon(C), nitrogen (N) and sulfur (S) contents in early and late leaves were measured at the end of the second year. The results showed: (1) Both elevated O3 concentration and drought treatments significantly reduced early leaf LMA, LA, ILW, leaf N and S contents, with a reduction of 28.7, 45.7, 61.3, 39.6, 16.1% by O3 stress and 12.5, 46.8, 53.5, 15.45 and 22% by drought stress, respectively, while only LMA of late leaf was reduced 12.1% by O3 treatments and LA and ILW were significantly reduced 23.3% and 30% by drought treatments. (2) Significant interactions of elevated atmospheric O3 concentration and mild drought were detected on LMA, LA, ILW, N and C contents in early leaves and LMA in late leaves. Except for LA, the decreases under interactive treatments were all less than independent O3 effects. In conclusion, late leaf had less responses to elevated O3 and drought stresses than early leaves which need to be considered separately. The interactive effects suggested drought had antagonistic effects with O3 on growth indicators except for LA, indicating drought could mitigate the adverse efforts from O3 effects.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.10.006
       
  • Studying the ability to absorb heavy metal of cadmium on the amount of
           sugar and chlorophyll using seedlings of berry specie (Morus alba) in
           pollution area

    • Authors: Abdolhosein Nahvi; Seyed Armin Hashemi; Mir Mozaffar Fallahchai
      Pages: 35 - 37
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Abdolhosein Nahvi, Seyed Armin Hashemi, Mir Mozaffar Fallahchai
      Heavy metals are from the group of problematic factors in the ecosystem that due to being non-absorbable and having physiological effects on the activity of living organisms at low concentrations are of particular importance. In this study, the ability of berry specie to absorb heavy metal of cadmium was studied. One year old seedlings of berry specie were prepared from the nursery, concentrations of zero and 100mg per liter of cadmium chloride solution were added to the seedlings pots soil after calculation, and after a three-month period of seedling growth, shoots and roots were separated, then the concentration amount of cadmium in the samples was determined and data were examined. The results of data analysis showed that the highest rate of cadmium accumulation in stems, roots and soil in treatment concentration is 54.76, 107.75 and 8.825mg per kg, respectively, and the rate of cadmium accumulation in total chlorophyll and sugar in treatment concentration is 3.16 and 0.6693mg per g, respectively, and based on the results of this research berry specie is relatively suitable for remediation of soils contaminated with cadmium.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.08.006
       
  • The effects of gap disturbance on the seedling emergence, survival and
           growth of two different native species in Inner Mongolia

    • Authors: Haiming Kan; Juying Wu; Yingjun Zhang; Guixia Liu
      Pages: 38 - 47
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Haiming Kan, Juying Wu, Yingjun Zhang, Guixia Liu
      A field study was conducted to investigate the effects of gap disturbance on the seedling establishment process of two native species. Seeds of Agropyron cristatum and Stipa krylovii were reseeded to artificially created gaps in a degraded steppe in North China. There were seven treatments: shoot gaps and root gaps (10cm, 20cm and 40cm in diameters), no gaps (control). Shoot gaps were formed by removing above ground vegetation and below ground biomass without restricting the re-growth of neighbor roots back into the gap. The root gaps were accomplished by using polyvinyl chloride pipes sunk in the soil of shoot gaps to exclude neighboring roots. Seedling emergence, survival and growth performance after 90days of growing were recorded for both species. Gap significantly increased soil moisture, especially for root gaps. Emergence increased significantly for both species as gap size increased. Seedling emergence and survivorship of both species were greater in gaps than in controls. However, the gap size showed a significantly negative effect on Agropyron cristatum's survivorship. Growth performance of Agropyron cristatum and Stipa krylovii differ in their response to gap disturbance. Gap had positive effects on seedling growth (including seedling height, dry weight, and numbers of tillers and leaves) of Stipa krylovii, but had negative effects on seedling growth of Agropyron cristatum. The two species have significantly different responses to gap disturbance. All results suggest that Stipa krylovii is a gap-enhanced species, and Agropyron cristatum is not. Predation by insects may be one of the key reasons to explain the stand dominance in this grassland.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.09.002
       
  • Sunflower germination and growth behavior under various gamma radiation
           absorbed doses

    • Authors: Fida Hussain; Munawar Iqbal; Syed Zahir Shah; M. Afzal Qamar; Tanveer H. Bokhari; Mazhar Abbas; Muhammad Younus
      Pages: 48 - 52
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Fida Hussain, Munawar Iqbal, Syed Zahir Shah, M. Afzal Qamar, Tanveer H. Bokhari, Mazhar Abbas, Muhammad Younus
      Gamma radiation, various absorbed doses (0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 krad) effects were evaluated on sunflower (Helianthus annus. L.) germination and growth characteristics. Sunflower healthy seeds were exposed to gamma radiation source Co60 at nuclear institute for food and agriculture and exposed seeds were grown under controlled laboratory conditions. In comparison to control, gamma radiation absorbed doses affected the measured response positively i.e., radical length, plumule length, number of roots, seedling fresh weight, seedling dry weight, germination percentage, time of germination and diameter of hypocotyl of sunflower enhanced up to 83.15%, 70.32%, 73.03%, 4.80%, 3.26%, 72.0%, −18.88% and 12.58%, respectively. The time of germination, fresh weight and percent moisture contents enhanced insignificantly, however, the response was higher than control. All gamma radiation absorbed doses showed a stimulatory effect on sunflower germination and seedling growth characteristics. The low gamma radiation absorbed doses were found to be more effective versus higher doses for enhancing the germination and growth characteristics of sunflower. In view of positive effect of gamma radiation of sunflower germination and growth characteristics, it is concluded that this techniques could possibly be used for the enhancement of germination, growth and ultimately yield in sunflower in areas where germination is low due to unfavorable conditions.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.09.009
       
  • Measurement and analysis of the yearly characteristics of deep-buried
           phreatic evaporation in a hyper-arid area

    • Authors: Hongshou Li; Wanfu Wang; Hongtao Zhan; Fei Qiu; Fasi Wu; Guobing Zhang
      Pages: 53 - 59
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Hongshou Li, Wanfu Wang, Hongtao Zhan, Fei Qiu, Fasi Wu, Guobing Zhang
      Water scarcity is the primary cause of land deterioration, so finding new available water resources is crucial to ecological restoration. We investigated a hyper-arid Gobi location in the Dunhuang Mogao Grottoes in this work wherein the burial depth of phreatic water is over 200m. An air-conditioner was used in a closed greenhouse to condense and measure the yearly amount of phreatic evaporation (PE) from 2010 to 2015. The results shown that the annual quantity of PE is 4.52mm, and that the PE has sinusoidal characteristics. The average PE is 0.0183mmd−1 from March to November. Accordingly, by monitoring the annual changes in soil-air temperature and humidity to a depth of 5.0m, we analyzed the water migration mechanism in the heterothermozone (subsurface zone of variable temperature). The results show that, from March to November, the temperature and absolute humidity (AH) increase. This is due to the flow of solar heat entering the soil — the soil subsequently releases moisture and the soil is in a state of increasing AH so that evaporation occurs. From November to March, the temperature decreases. Now, the soil absorbs water vapor and AH is in a state of decline. Thus, it is temperature alternation in the heterothermozone — due to solar heat transfer — that provides the main driving power for PE. When it drives water vapor to move downwards in the heterothermozone, a small part is reversed upwards and evaporates. Solar radiation intensity dominates the annual sinusoidal PE characteristics.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.10.001
       
  • Mineralization of amino acids and its signs in nitrogen cycling of forest
           soil

    • Authors: Hongliang Ma; Guangting Pei; Ren Gao; Yunfeng Yin
      Pages: 60 - 63
      Abstract: Publication date: February 2017
      Source:Acta Ecologica Sinica, Volume 37, Issue 1
      Author(s): Hongliang Ma, Guangting Pei, Ren Gao, Yunfeng Yin
      Amino acid mineralization and its fate in soil have effects on soil nitrogen cycling. Here we used 15N-labeled alanine and methionine to study differences in their mineralization from soil organic nitrogen under 60% WHC (water holding capacity) and 90% WHC soil conditions. We found that the maximum mineralization rates were at the 24th hours for alanine and at the 5th hours for methionine, and about two times greater rates at 60% WHC than at 90% WHC. The half-live was 24–72h for alanine and >72h for methionine. Half-lives of amino acids occurred sooner under 90% WHC than under 60% WHC. The results suggested that some kind of amino acids do lead the nitrogen cycling in a specific ecosystem or as a sign to trigger soil nitrogen cycling when land utilization was altered or disturbed severely by humans.

      PubDate: 2017-01-15T12:00:16Z
      DOI: 10.1016/j.chnaes.2016.09.001
       
 
 
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