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Publisher: Oxford University Press   (Total: 370 journals)

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Showing 1 - 200 of 370 Journals sorted alphabetically
Acta Biochimica et Biophysica Sinica     Hybrid Journal   (Followers: 6, SJR: 0.881, h-index: 38)
Adaptation     Hybrid Journal   (Followers: 8, SJR: 0.111, h-index: 4)
Aesthetic Surgery J.     Hybrid Journal   (Followers: 6, SJR: 1.538, h-index: 35)
African Affairs     Hybrid Journal   (Followers: 57, SJR: 1.512, h-index: 46)
Age and Ageing     Hybrid Journal   (Followers: 81, SJR: 1.611, h-index: 107)
Alcohol and Alcoholism     Hybrid Journal   (Followers: 14, SJR: 0.935, h-index: 80)
American Entomologist     Full-text available via subscription   (Followers: 6)
American Historical Review     Hybrid Journal   (Followers: 125, SJR: 0.652, h-index: 43)
American J. of Agricultural Economics     Hybrid Journal   (Followers: 41, SJR: 1.441, h-index: 77)
American J. of Epidemiology     Hybrid Journal   (Followers: 151, SJR: 3.047, h-index: 201)
American J. of Hypertension     Hybrid Journal   (Followers: 18, SJR: 1.397, h-index: 111)
American J. of Jurisprudence     Hybrid Journal   (Followers: 15)
American journal of legal history     Full-text available via subscription   (Followers: 4, SJR: 0.151, h-index: 7)
American Law and Economics Review     Hybrid Journal   (Followers: 26, SJR: 0.824, h-index: 23)
American Literary History     Hybrid Journal   (Followers: 12, SJR: 0.185, h-index: 22)
Analysis     Hybrid Journal   (Followers: 24)
Annals of Botany     Hybrid Journal   (Followers: 35, SJR: 1.912, h-index: 124)
Annals of Occupational Hygiene     Hybrid Journal   (Followers: 26, SJR: 0.837, h-index: 57)
Annals of Oncology     Hybrid Journal   (Followers: 48, SJR: 4.362, h-index: 173)
Annals of the Entomological Society of America     Full-text available via subscription   (Followers: 8, SJR: 0.642, h-index: 53)
Annals of Work Exposures and Health     Hybrid Journal  
AoB Plants     Open Access   (Followers: 4, SJR: 0.78, h-index: 10)
Applied Economic Perspectives and Policy     Hybrid Journal   (Followers: 19, SJR: 0.884, h-index: 31)
Applied Linguistics     Hybrid Journal   (Followers: 51, SJR: 1.749, h-index: 63)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1, SJR: 0.779, h-index: 11)
Arbitration Intl.     Full-text available via subscription   (Followers: 19)
Arbitration Law Reports and Review     Hybrid Journal   (Followers: 12)
Archives of Clinical Neuropsychology     Hybrid Journal   (Followers: 26, SJR: 0.96, h-index: 71)
Aristotelian Society Supplementary Volume     Hybrid Journal   (Followers: 2, SJR: 0.102, h-index: 20)
Arthropod Management Tests     Hybrid Journal   (Followers: 2)
Astronomy & Geophysics     Hybrid Journal   (Followers: 47, SJR: 0.144, h-index: 15)
Behavioral Ecology     Hybrid Journal   (Followers: 46, SJR: 1.698, h-index: 92)
Bioinformatics     Hybrid Journal   (Followers: 231, SJR: 4.643, h-index: 271)
Biology Methods and Protocols     Hybrid Journal  
Biology of Reproduction     Full-text available via subscription   (Followers: 9, SJR: 1.646, h-index: 149)
Biometrika     Hybrid Journal   (Followers: 19, SJR: 2.801, h-index: 90)
BioScience     Hybrid Journal   (Followers: 28, SJR: 2.374, h-index: 154)
Bioscience Horizons : The National Undergraduate Research J.     Open Access   (Followers: 1, SJR: 0.213, h-index: 9)
Biostatistics     Hybrid Journal   (Followers: 16, SJR: 1.955, h-index: 55)
BJA : British J. of Anaesthesia     Hybrid Journal   (Followers: 134, SJR: 2.314, h-index: 133)
BJA Education     Hybrid Journal   (Followers: 65, SJR: 0.272, h-index: 20)
Brain     Hybrid Journal   (Followers: 61, SJR: 6.097, h-index: 264)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 45, SJR: 4.086, h-index: 73)
Briefings in Functional Genomics     Hybrid Journal   (Followers: 4, SJR: 1.771, h-index: 50)
British J. for the Philosophy of Science     Hybrid Journal   (Followers: 33, SJR: 1.267, h-index: 38)
British J. of Aesthetics     Hybrid Journal   (Followers: 25, SJR: 0.217, h-index: 18)
British J. of Criminology     Hybrid Journal   (Followers: 502, SJR: 1.373, h-index: 62)
British J. of Social Work     Hybrid Journal   (Followers: 80, SJR: 0.771, h-index: 53)
British Medical Bulletin     Hybrid Journal   (Followers: 7, SJR: 1.391, h-index: 84)
British Yearbook of Intl. Law     Hybrid Journal   (Followers: 26)
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3, SJR: 1.474, h-index: 31)
Cambridge J. of Economics     Hybrid Journal   (Followers: 54, SJR: 0.957, h-index: 59)
Cambridge J. of Regions, Economy and Society     Hybrid Journal   (Followers: 9, SJR: 1.067, h-index: 22)
Cambridge Quarterly     Hybrid Journal   (Followers: 10, SJR: 0.1, h-index: 7)
Capital Markets Law J.     Hybrid Journal  
Carcinogenesis     Hybrid Journal   (Followers: 2, SJR: 2.439, h-index: 167)
Cardiovascular Research     Hybrid Journal   (Followers: 11, SJR: 2.897, h-index: 175)
Cerebral Cortex     Hybrid Journal   (Followers: 39, SJR: 4.827, h-index: 192)
CESifo Economic Studies     Hybrid Journal   (Followers: 16, SJR: 0.501, h-index: 19)
Chemical Senses     Hybrid Journal   (Followers: 1, SJR: 1.436, h-index: 76)
Children and Schools     Hybrid Journal   (Followers: 6, SJR: 0.211, h-index: 18)
Chinese J. of Comparative Law     Hybrid Journal   (Followers: 3)
Chinese J. of Intl. Law     Hybrid Journal   (Followers: 19, SJR: 0.737, h-index: 11)
Chinese J. of Intl. Politics     Hybrid Journal   (Followers: 8, SJR: 1.238, h-index: 15)
Christian Bioethics: Non-Ecumenical Studies in Medical Morality     Hybrid Journal   (Followers: 11, SJR: 0.191, h-index: 8)
Classical Receptions J.     Hybrid Journal   (Followers: 17, SJR: 0.1, h-index: 3)
Clinical Infectious Diseases     Hybrid Journal   (Followers: 59, SJR: 4.742, h-index: 261)
Clinical Kidney J.     Open Access   (Followers: 4, SJR: 0.338, h-index: 19)
Community Development J.     Hybrid Journal   (Followers: 24, SJR: 0.47, h-index: 28)
Computer J.     Hybrid Journal   (Followers: 8, SJR: 0.371, h-index: 47)
Conservation Physiology     Open Access   (Followers: 2)
Contemporary Women's Writing     Hybrid Journal   (Followers: 11, SJR: 0.111, h-index: 3)
Contributions to Political Economy     Hybrid Journal   (Followers: 6, SJR: 0.313, h-index: 10)
Critical Values     Full-text available via subscription  
Current Legal Problems     Hybrid Journal   (Followers: 25)
Current Zoology     Full-text available via subscription   (SJR: 0.999, h-index: 20)
Database : The J. of Biological Databases and Curation     Open Access   (Followers: 11, SJR: 1.068, h-index: 24)
Digital Scholarship in the Humanities     Hybrid Journal   (Followers: 12)
Diplomatic History     Hybrid Journal   (Followers: 18, SJR: 0.296, h-index: 22)
DNA Research     Open Access   (Followers: 4, SJR: 2.42, h-index: 77)
Dynamics and Statistics of the Climate System     Open Access   (Followers: 3)
Early Music     Hybrid Journal   (Followers: 13, SJR: 0.124, h-index: 11)
Economic Policy     Hybrid Journal   (Followers: 52, SJR: 2.052, h-index: 52)
ELT J.     Hybrid Journal   (Followers: 25, SJR: 1.26, h-index: 23)
English Historical Review     Hybrid Journal   (Followers: 46, SJR: 0.311, h-index: 10)
English: J. of the English Association     Hybrid Journal   (Followers: 12, SJR: 0.144, h-index: 3)
Environmental Entomology     Full-text available via subscription   (Followers: 11, SJR: 0.791, h-index: 66)
Environmental Epigenetics     Open Access   (Followers: 1)
Environmental History     Hybrid Journal   (Followers: 25, SJR: 0.197, h-index: 25)
EP-Europace     Hybrid Journal   (Followers: 2, SJR: 2.201, h-index: 71)
Epidemiologic Reviews     Hybrid Journal   (Followers: 9, SJR: 3.917, h-index: 81)
ESHRE Monographs     Hybrid Journal  
Essays in Criticism     Hybrid Journal   (Followers: 15, SJR: 0.1, h-index: 6)
European Heart J.     Hybrid Journal   (Followers: 47, SJR: 6.997, h-index: 227)
European Heart J. - Cardiovascular Imaging     Hybrid Journal   (Followers: 9, SJR: 2.044, h-index: 58)
European Heart J. - Cardiovascular Pharmacotherapy     Full-text available via subscription   (Followers: 1)
European Heart J. - Quality of Care and Clinical Outcomes     Hybrid Journal  
European Heart J. Supplements     Hybrid Journal   (Followers: 8, SJR: 0.152, h-index: 31)
European J. of Cardio-Thoracic Surgery     Hybrid Journal   (Followers: 7, SJR: 1.568, h-index: 104)
European J. of Intl. Law     Hybrid Journal   (Followers: 147, SJR: 0.722, h-index: 38)
European J. of Orthodontics     Hybrid Journal   (Followers: 4, SJR: 1.09, h-index: 60)
European J. of Public Health     Hybrid Journal   (Followers: 22, SJR: 1.284, h-index: 64)
European Review of Agricultural Economics     Hybrid Journal   (Followers: 12, SJR: 1.549, h-index: 42)
European Review of Economic History     Hybrid Journal   (Followers: 26, SJR: 0.628, h-index: 24)
European Sociological Review     Hybrid Journal   (Followers: 37, SJR: 2.061, h-index: 53)
Evolution, Medicine, and Public Health     Open Access   (Followers: 11)
Family Practice     Hybrid Journal   (Followers: 13, SJR: 1.048, h-index: 77)
Fems Microbiology Ecology     Hybrid Journal   (Followers: 8, SJR: 1.687, h-index: 115)
Fems Microbiology Letters     Hybrid Journal   (Followers: 20, SJR: 1.126, h-index: 118)
Fems Microbiology Reviews     Hybrid Journal   (Followers: 25, SJR: 7.587, h-index: 150)
Fems Yeast Research     Hybrid Journal   (Followers: 13, SJR: 1.213, h-index: 66)
Foreign Policy Analysis     Hybrid Journal   (Followers: 21, SJR: 0.859, h-index: 10)
Forestry: An Intl. J. of Forest Research     Hybrid Journal   (Followers: 16, SJR: 0.903, h-index: 44)
Forum for Modern Language Studies     Hybrid Journal   (Followers: 6, SJR: 0.108, h-index: 6)
French History     Hybrid Journal   (Followers: 30, SJR: 0.123, h-index: 10)
French Studies     Hybrid Journal   (Followers: 19, SJR: 0.119, h-index: 7)
French Studies Bulletin     Hybrid Journal   (Followers: 10, SJR: 0.102, h-index: 3)
Gastroenterology Report     Open Access   (Followers: 2)
Genome Biology and Evolution     Open Access   (Followers: 10, SJR: 3.22, h-index: 39)
Geophysical J. Intl.     Hybrid Journal   (Followers: 31, SJR: 1.839, h-index: 119)
German History     Hybrid Journal   (Followers: 25, SJR: 0.437, h-index: 13)
GigaScience     Open Access   (Followers: 3)
Global Summitry     Hybrid Journal  
Glycobiology     Hybrid Journal   (Followers: 14, SJR: 1.692, h-index: 101)
Health and Social Work     Hybrid Journal   (Followers: 45, SJR: 0.505, h-index: 40)
Health Education Research     Hybrid Journal   (Followers: 12, SJR: 0.814, h-index: 80)
Health Policy and Planning     Hybrid Journal   (Followers: 21, SJR: 1.628, h-index: 66)
Health Promotion Intl.     Hybrid Journal   (Followers: 20, SJR: 0.664, h-index: 60)
History Workshop J.     Hybrid Journal   (Followers: 27, SJR: 0.313, h-index: 20)
Holocaust and Genocide Studies     Hybrid Journal   (Followers: 23, SJR: 0.115, h-index: 13)
Human Molecular Genetics     Hybrid Journal   (Followers: 9, SJR: 4.288, h-index: 233)
Human Reproduction     Hybrid Journal   (Followers: 76, SJR: 2.271, h-index: 179)
Human Reproduction Update     Hybrid Journal   (Followers: 16, SJR: 4.678, h-index: 128)
Human Rights Law Review     Hybrid Journal   (Followers: 58, SJR: 0.7, h-index: 21)
ICES J. of Marine Science: J. du Conseil     Hybrid Journal   (Followers: 54, SJR: 1.233, h-index: 88)
ICSID Review     Hybrid Journal   (Followers: 9)
ILAR J.     Hybrid Journal   (Followers: 1, SJR: 1.099, h-index: 51)
IMA J. of Applied Mathematics     Hybrid Journal   (SJR: 0.329, h-index: 26)
IMA J. of Management Mathematics     Hybrid Journal   (Followers: 2, SJR: 0.351, h-index: 20)
IMA J. of Mathematical Control and Information     Hybrid Journal   (Followers: 2, SJR: 0.661, h-index: 28)
IMA J. of Numerical Analysis - advance access     Hybrid Journal   (SJR: 2.032, h-index: 44)
Industrial and Corporate Change     Hybrid Journal   (Followers: 8, SJR: 1.37, h-index: 81)
Industrial Law J.     Hybrid Journal   (Followers: 29, SJR: 0.184, h-index: 15)
Information and Inference     Free  
Integrative and Comparative Biology     Hybrid Journal   (Followers: 8, SJR: 1.911, h-index: 90)
Interacting with Computers     Hybrid Journal   (Followers: 10, SJR: 0.529, h-index: 59)
Interactive CardioVascular and Thoracic Surgery     Hybrid Journal   (Followers: 4, SJR: 0.743, h-index: 35)
Intl. Affairs     Hybrid Journal   (Followers: 51, SJR: 1.264, h-index: 53)
Intl. Data Privacy Law     Hybrid Journal   (Followers: 26)
Intl. Health     Hybrid Journal   (Followers: 4, SJR: 0.835, h-index: 15)
Intl. Immunology     Hybrid Journal   (Followers: 3, SJR: 1.613, h-index: 111)
Intl. J. for Quality in Health Care     Hybrid Journal   (Followers: 32, SJR: 1.593, h-index: 69)
Intl. J. of Constitutional Law     Hybrid Journal   (Followers: 59, SJR: 0.613, h-index: 19)
Intl. J. of Epidemiology     Hybrid Journal   (Followers: 122, SJR: 4.381, h-index: 145)
Intl. J. of Law and Information Technology     Hybrid Journal   (Followers: 3, SJR: 0.247, h-index: 8)
Intl. J. of Law, Policy and the Family     Hybrid Journal   (Followers: 28, SJR: 0.307, h-index: 15)
Intl. J. of Lexicography     Hybrid Journal   (Followers: 8, SJR: 0.404, h-index: 18)
Intl. J. of Low-Carbon Technologies     Open Access   (Followers: 1, SJR: 0.457, h-index: 12)
Intl. J. of Neuropsychopharmacology     Open Access   (Followers: 3, SJR: 1.69, h-index: 79)
Intl. J. of Public Opinion Research     Hybrid Journal   (Followers: 8, SJR: 0.906, h-index: 33)
Intl. J. of Refugee Law     Hybrid Journal   (Followers: 32, SJR: 0.231, h-index: 21)
Intl. J. of Transitional Justice     Hybrid Journal   (Followers: 13, SJR: 0.833, h-index: 12)
Intl. Mathematics Research Notices     Hybrid Journal   (Followers: 1, SJR: 2.052, h-index: 42)
Intl. Political Sociology     Hybrid Journal   (Followers: 26, SJR: 1.339, h-index: 19)
Intl. Relations of the Asia-Pacific     Hybrid Journal   (Followers: 17, SJR: 0.539, h-index: 17)
Intl. Studies Perspectives     Hybrid Journal   (Followers: 7, SJR: 0.998, h-index: 28)
Intl. Studies Quarterly     Hybrid Journal   (Followers: 36, SJR: 2.184, h-index: 68)
Intl. Studies Review     Hybrid Journal   (Followers: 17, SJR: 0.783, h-index: 38)
ISLE: Interdisciplinary Studies in Literature and Environment     Hybrid Journal   (Followers: 1, SJR: 0.155, h-index: 4)
ITNOW     Hybrid Journal   (Followers: 2, SJR: 0.102, h-index: 4)
J. of African Economies     Hybrid Journal   (Followers: 15, SJR: 0.647, h-index: 30)
J. of American History     Hybrid Journal   (Followers: 39, SJR: 0.286, h-index: 34)
J. of Analytical Toxicology     Hybrid Journal   (Followers: 13, SJR: 1.038, h-index: 60)
J. of Antimicrobial Chemotherapy     Hybrid Journal   (Followers: 19, SJR: 2.157, h-index: 149)
J. of Antitrust Enforcement     Hybrid Journal   (Followers: 1)
J. of Applied Poultry Research     Hybrid Journal   (Followers: 3, SJR: 0.563, h-index: 43)
J. of Biochemistry     Hybrid Journal   (Followers: 44, SJR: 1.341, h-index: 96)
J. of Chromatographic Science     Hybrid Journal   (Followers: 16, SJR: 0.448, h-index: 42)
J. of Church and State     Hybrid Journal   (Followers: 11, SJR: 0.167, h-index: 11)
J. of Competition Law and Economics     Hybrid Journal   (Followers: 34, SJR: 0.442, h-index: 16)
J. of Complex Networks     Hybrid Journal   (Followers: 1, SJR: 1.165, h-index: 5)
J. of Conflict and Security Law     Hybrid Journal   (Followers: 11, SJR: 0.196, h-index: 15)
J. of Consumer Research     Full-text available via subscription   (Followers: 40, SJR: 4.896, h-index: 121)
J. of Crohn's and Colitis     Hybrid Journal   (Followers: 9, SJR: 1.543, h-index: 37)
J. of Cybersecurity     Hybrid Journal   (Followers: 3)
J. of Deaf Studies and Deaf Education     Hybrid Journal   (Followers: 8, SJR: 0.69, h-index: 36)
J. of Design History     Hybrid Journal   (Followers: 15, SJR: 0.166, h-index: 14)
J. of Economic Entomology     Full-text available via subscription   (Followers: 6, SJR: 0.894, h-index: 76)
J. of Economic Geography     Hybrid Journal   (Followers: 34, SJR: 2.909, h-index: 69)
J. of Environmental Law     Hybrid Journal   (Followers: 23, SJR: 0.457, h-index: 20)
J. of European Competition Law & Practice     Hybrid Journal   (Followers: 19)
J. of Experimental Botany     Hybrid Journal   (Followers: 14, SJR: 2.798, h-index: 163)
J. of Financial Econometrics     Hybrid Journal   (Followers: 21, SJR: 1.314, h-index: 27)
J. of Global Security Studies     Hybrid Journal   (Followers: 2)
J. of Heredity     Hybrid Journal   (Followers: 3, SJR: 1.024, h-index: 76)
J. of Hindu Studies     Hybrid Journal   (Followers: 7, SJR: 0.186, h-index: 3)
J. of Hip Preservation Surgery     Open Access  
J. of Human Rights Practice     Hybrid Journal   (Followers: 20, SJR: 0.399, h-index: 10)
J. of Infectious Diseases     Hybrid Journal   (Followers: 40, SJR: 4, h-index: 209)
J. of Insect Science     Open Access   (Followers: 9, SJR: 0.388, h-index: 31)

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Journal Cover Forestry: An International Journal of Forest Research
  [SJR: 0.903]   [H-I: 44]   [16 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0015-752X - ISSN (Online) 1464-3626
   Published by Oxford University Press Homepage  [370 journals]
  • The development of uneven-aged southern pine silviculture before the
           Crossett Experimental Forest (Arkansas, USA)
    • Authors: Bragg DC.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Although the Crossett Experimental Forest (CEF) played a well-publicized role in the development of uneven-aged southern pine silviculture, work on a selection method in Arkansas (USA) did not originate there. In 1925, Leslie Pomeroy and Eugene Connor acquired the Ozark Badger Lumber Company and initiated an expert-driven selection management system compatible with small parcels, with few absolute rules but requiring familiarity with local conditions. Deceptively simple in its application, the uneven-aged silviculture practised by Pomeroy and Connor removed mature shortleaf (<span style="font-style:italic;">Pinus echinata</span> Mill.) and loblolly (<span style="font-style:italic;">Pinus taeda</span> L.) pines to improve growth of the residual trees and encourage the establishment and release of pine seedlings. For their approach to work, Pomeroy and Connor needed self-sustaining, fast-growing, accessible stands, and the privately owned, pine-dominated forests of southern Arkansas proved amenable. By the mid-1930s, Pomeroy and Connor had engaged many local farmers and small forest owners in an arrangement coined ‘pine-tree banking’. In pine-tree banking, they tended thousands of hectares of other landowners’ forests with their brand of uneven-aged silviculture, providing landowners with a dependable income and helping to assure a steady supply of sawtimber for Ozark Badger. The success of Ozark Badger no doubt helped inspire later work at the CEF and helped draw many visitors, including foresters, government officials, visiting academics, university students, and other landowners. While the better-documented uneven-aged southern pine silviculture on the CEF soon outshone the efforts of Pomeroy, Connor, and Ozark Badger, they were the operational pioneers of this system in Arkansas and deserve to be recognized as such.</span>
      PubDate: 2017-03-28
       
  • Allometric equations for biomass and carbon stocks of forests along an
           altitudinal gradient in the eastern Himalayas
    • Authors: Tashi S; Keitel C, Singh B, et al.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Allometric equations remain essential to the estimation of forest biomass and carbon (C) stocks. However, such equations have mainly been developed for American and European forests, and transferring them to other species or eco-regions is problematic. There are large forested areas in the eastern Himalayas, but we lack all but the most rudimentary biomass equations and this hinders reliable estimates of C stocks. We destructively harvested 144 trees with diameters ranging from 10 to 77 cm, from five different forest types along an altitudinal gradient from 317 to 3300 m a.s.l. and used these to construct allometric equations. Out of six models, we identified two that could predict AGB across a range of trees, including those at the upper and the lower ends of the scale. The models were mainly a function of diameter at breast height (DBH) with height (H) as an additional factor for lower altitude forest types. Inclusion of specific gravity (SG) of wood improved models for three of the five forest types. We provide both types of models and argue that wood SG should be collected during forest inventories as it is an important predictive variable especially for mixed species forests. The average deviation of the measured and estimated AGB ranged between 15.9 and 38.5 per cent for the various models for the different forest types. With the best-fit models, estimated aboveground C stocks increased with altitude from 57 to 207 Mg C ha<sup>−1</sup>. The use of measured C concentration rather than an assumption of 50 per cent of biomass reduced estimated AGB C stocks between 6.8 and 8.6 per cent.</span>
      PubDate: 2017-02-15
       
  • Intensive forestry filters understory plant traits over time and space in
           boreal forests
    • Authors: Patry C; Kneeshaw D, Aubin I, et al.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Because of their scarcity, protected areas alone cannot maintain biodiversity. Therefore, it is necessary to create conditions appropriate for plants and wildlife in managed landscapes. We compared the effects of different intensities of forest management on functional responses of vascular understory plants using the fourth-corner method. We analysed functional community composition along a management gradient that spanned semi-natural forests to extensively managed forests (naturally regenerated cuts) to intensively managed forests (planted forests) in Canada. Results showed trait filtering along the gradient of forest management intensity. In natural and extensively managed forests, where forest retention was high in time and space, persistence traits (e.g. perennial geophytes or chamaephytes, non-leafy stem foliage structure) were maintained. At the opposite end of the gradient, in intensively managed plantations where forest retention elements (e.g. amount of dead wood) were reduced, trait filtering led to species associated with colonization, such as tall species with limited lateral extension. These results suggest that intensive forestry conducted over a large extent may change the functional composition of understory plants.</span>
      PubDate: 2017-02-14
       
  • Identifying factors that influence the success of forestry research
           projects implemented in developing countries: case study results from
           Vietnam
    • Authors: Bartlett AG; Kanowski PJ, van Kerkhoff LL, et al.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>This paper reports a qualitative investigation of factors contributing to success in 10 collaborative international forestry research projects funded by the Australian Centre for International Agricultural Research (ACIAR) in Vietnam. Success factors were identified, and the relative success of projects was evaluated in terms of research achievements and impacts, through analysis of ACIAR's project records and interviews with key project participants. This process identified 22 factors considered to either enhance or diminish project success, with the most frequently identified being: collaborative scoping and design; skills mix and time allocations; funding and equipment; scientists’ commitment and collaboration; and capacity building. Three projects, representing different categories of assessed research achievement and impact, were examined for evidence of relationships between these success factors and the relative success of the projects. This assessment suggested that most of the identified success factors were evident in the project with high research achievements and high impacts; and, conversely, that there was evidence of factors that diminish project success in a project that had low achievements and low impacts. The results reported here can help improve the design and implementation of future collaborative forestry research projects.</span>
      PubDate: 2017-02-03
       
  • An assessment of uncertainty in volume estimates for stands reconstructed
           from tree stump information
    • Authors: Westfall JA; McRoberts RE.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Assessment of pre-harvest stand conditions after unplanned tree removals often requires reconstruction of the stand based on stump information. Prediction of diameter at breast height (d.b.h.) from stump measurements is a common practice because d.b.h. is usually a necessary precursor for estimating diameter distributions and predicting tree volume. Although not a widespread exercise, tree volumes are sometimes predicted directly from stump dimensions. Regardless of the approach taken, statistical models are invariably used in some manner and the model predictions are erroneously assumed to be without error. In this study, several methods for tree volume prediction arising from stump information were evaluated for the contribution of model-related uncertainty to the error in population estimates of total volume. When the entire population was enumerated, the model-related uncertainty was 1–2 per cent of the estimate depending on the volume estimation method. Sampling approaches based on individual stumps and 0.042 ha plots were evaluated, where the total uncertainty due to both model and sampling error was considerably larger when using the plot-based method. Generally, the smallest amount of error was present when predicting d.b.h. and then estimating tree volume from d.b.h. The uncertainty was largest for estimation of tree volume directly from stump dimensions when sampling proportions were ~0.35 or smaller; otherwise, the largest uncertainty resulted from prediction of d.b.h. and merchantable height which were both used as predictor variables in the volume model.</span>
      PubDate: 2017-01-29
       
  • Individual tree basal area increment models for broadleaved forests in
           Bhutan
    • Authors: Tenzin J; Tenzin K, Hasenauer H.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>The correct and accurate assessments of growing stock (stem volume) in combination with forest growth predictions from models are essential for sustainable forest management. Currently, no such information exists for the broadleaved forests of Bhutan. This study evaluates the important factors of individual tree growth for broadleaved species in Dagana, Bhutan. Data were collected from 96 inventory plots covering forest stand information, tree and stand parameters along with 5-year tree growth increment information from tree cores. Due to the large number of tree species (87), four species groups were created using principal component and cluster analysis to simplify the calibration of individual tree basal area increment (BAI) models. The main determinants of tree growth were shown to be tree size variables and competition within a forest stand. Distance dependent competition indices showed higher correlation to growth than distance independent competition indices. The resulting increment models provided consistent and unbiased estimates of individual tree BAI predictions. Increasing competition levels reduce the productivity of the individual trees. This emphasises the need for crown release to obtain higher individual tree growth. We demonstrate that the BAI models developed in this study can be used to predict tree growth by species group according to different stand density conditions and, if they are verified on a wider scale, could form the basis of sustainable forest management in Bhutan.</span>
      PubDate: 2017-01-27
       
  • A new approach to assessing the risk to woodland from pest and diseases
    • Authors: Davies S; Patenaude G, Snowdon P.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Pests and diseases pose a growing threat to woodlands from both endemic sources, and increasingly, from interregional transmission. Strong comparative analyses of this threat are needed in order to develop preventative measures. Such analyses should include estimates of the potential worst-case loss from all relevant pest and disease (P&D) threats to key tree species. Existing approaches tend to focus on individual assessments of the risk from a single pest or disease, or assessments of overall trends. Effective risk management requires more comprehensive quantified assessments of the overall threat to woodland that includes comparisons of the threat to individual tree species and identification of the potentially most damaging P&Ds. Such assessments support important policy and management decisions including species selection; preventative action; and the size of buffers against losses from forest carbon projects. Here we present a new approach that supports a systematic, risk-based assessment of the future threat to a given woodland from all known individual P&Ds, and to constituent individual tree species, based on a risk management approach taken from the finance sector, but hitherto not applied in an ecological context. Unknown or unidentified pests and diseases can systematically be added in future as identified. We demonstrate the method through a case study evaluating the threat to projects certified under the UK's Woodland Carbon Code. The approach can be adapted to any woodland resource worldwide. Its novelty lies in the simplification of complex threats, from numerous pests and diseases, to measures that can be used by a range of forest stakeholders.</span>
      PubDate: 2017-01-27
       
  • An assessment of mangrove diseases and pests in South Africa
    • Authors: Osorio J; Crous CJ, Wingfield MJ, et al.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Mangroves are critically important components of coastal ecosystems. However, their survival is globally threatened, mostly due to impacts resulting from human activities. Reports of mangrove deaths associated with pathogens and insect pests have emerged during the past few years. In South Africa, mangrove species are under pressure from both environmental and anthropogenic disturbances, potentially making them more susceptible to diseases. We present the most detailed evaluation of possible biotic causes of mangrove decline in South Africa to date. Surveys covering the entire distribution range of mangroves in the country were conducted. Qualitative and quantitative data from siltation of pneumatophores, stand density, diameter at breast height and the presence of wood-boring beetles were correlated with disease incidence and severity to elucidate the possible relationships with mangrove health. Phylogenetic analyses were performed to determine the taxonomic placement of fungi isolated from symptomatic trees. Of five true mangrove species and two mangrove associates examined, only <span style="font-style:italic;">Avicennia marina</span> showed signs and symptoms of branch and stem cankers, die-back, wood-boring insects and leaf galls. <span style="font-style:italic;">Barringtonia racemosa</span> showed symptoms of fruit and leaf disease and <span style="font-style:italic;">Hibiscus tiliaceus</span> was observed with herbivory by leaf-feeding beetles. Using a multivariate approach, the presence of beetles and high pneumatophore siltation appeared to be associated with the observed die-back and canker levels of <span style="font-style:italic;">A</span>.<span style="font-style:italic;"> marina</span>. Four main fungal groups were recovered from symptomatic trees. The results suggest that natural and anthropogenic stressors exerted on the mangrove trees lead to the colonization of an array of opportunistic pests and diseases.</span>
      PubDate: 2017-01-19
       
  • The effects of gap size in a group selection silvicultural system on the
           growth response of young, planted Douglas-fir: a sector plot analysis
    • Authors: de Montigny LE; Smith NJ.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>The growth response of planted 7- and 11-year-old Douglas-fir was measured in a series of 11 group selection harvest gaps ranging in size from 0.05 to 1.1 ha repeated on two study sites. The sites are part of the Silviculture Treatments for Ecosystem Management in the Sayward experiment on central-eastern Vancouver Island, British Columbia, Canada. In each gap, trees were measured in four 9° sector plots oriented in orthogonal cardinal directions from a central vertex. A non-linear two-parameter model was used to examine relationships between per tree and unit area measures and gap size. Despite high levels of growth variability, there was a general, consistent asymptotic growth response to increasing gap size. The minimum gap size required for adequate Douglas-fir sapling height growth was between 0.24 and 0.33 ha and the gap diameter divided by surrounding residual tree dominant height (Dgap/Hgap) at the two sites was 1.5 and 2.2. The site with the smaller minimum gap size had taller surrounding residual trees and thus lower light levels, but had higher relative soil moisture and nutrients and was a younger age at the time of sampling. The largest gap size sampled in this study was relatively small (1.1 ha) and greater growth responses are likely in gaps larger than this. The results of this study suggest that gap sizes below a minimum will not create conditions to ensure adequate growth of Douglas-fir regeneration in group selection systems. In addition, only one group selection pass is examined here: under full implementation several group selection passes are envisaged leading to further changes in the gap-level environment throughout. Further work is needed to confirm the localized relationships found here including: greater replication across a range of site quality, sampling of larger gap sizes and examination of older ages of both regeneration and surround trees.</span>
      PubDate: 2017-01-19
       
  • Pinus strobiformis seedling growth in southwestern US mixed conifer
           forests in managed and non-managed stands
    • Authors: Goodrich BA; Waring KM.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Resources available for tree regeneration growth vary within and between stands. Understanding variation can help land managers choose appropriate sites and management strategies for desired regeneration. We measured southwestern white pine (<span style="font-style:italic;">Pinus strobiformis,</span> SWWP) age, annual height growth, stem diameter, crown widths and lengths, needle lengths and branch morphology to determine geographic variation and effects of different silvicultural treatments on seedling height growth in southwestern US mixed conifer stands. We hypothesized both between- and within-stand variables would be related to mean and recent height growth. Thirty-seven per cent of the variance in mean annual growth (cm yr<sup>−1</sup>) was explained; growth increased with Douglas-fir site index and on north-facing slopes, and decreased with increasing ponderosa pine densities and per cent ground cover of litter. Recent 3-year height growth increased with site index and decreased with per cent ground cover of litter, increasing canopy closure and in the presence of a nearby microsite object. Height growth was less near downed-woody debris and next to the base of overstory trees. Land managers can use results by regenerating SWWP (natural or planted) on higher productivity sites and north-facing slopes, and avoiding areas with thick layers of litter/duff or planting in areas with high ponderosa pine seedling densities. Stimulating natural regeneration or outplanting seedlings may be necessary to sustain SWWP with the dual threats of climate change and an invasive pathogen.</span>
      PubDate: 2016-11-16
       
  • Mixing effects on growth efficiency in mixed pine forests
    • Authors: Riofrío J; del Río M, Bravo F.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Increased interest in mixed forests is due to evidence of them being more resource-use efficient and stable forest systems. However, intrinsic and extrinsic factors moderate interspecific species interactions generating different effects in productivity. Here, we explore a method to detect mixing effects in a specific mixture combination (<span style="font-style:italic;">Pinus sylvestris</span> L. and <span style="font-style:italic;">Pinus pinaster</span> Ait.), comparing the growth of mixed stands with that of monocultures. Combined tree and stand-level analyses also helped determine which mixing effects are most important for forest functioning and how changes at one level influence patterns at another level. Data from the Spanish National Forest Inventory were used to compare growth efficiency in mixed and pure stands; we relied on relative stand density indices to determine species-specific site occupancy. This same concept was used to evaluate competition status and inter/intra-specific competition effects as modifiers of potential growth at the tree-level. We observed that growth efficiency in both species increased with the proportion of the complementary species in the stand. At the tree-level, intraspecific competition was higher than interspecific competition in Scots pine tree growth, showing that it had benefited from the mixture. In contrast, maritime pine did not show a competitive response to the interspecific interaction, indicating that tree growth was more strongly influenced by the competition structure (size-symmetric and size-asymmetric) than by the species of the competitors. Our results highlight the importance of combining stand-level analysis with that of tree-specific competition relationships when studying mixed-species forests.</span>
      PubDate: 2016-11-09
       
  • Form factor functions for nine commercial tree species in Bhutan
    • Authors: Tenzin J; Wangchuk T, Hasenauer H.
      Abstract: <span class="paragraphSection"><div class="boxTitle"> </div>Standing timber volume in combination with the expected volume increment rates derived from volume functions are essential for developing sustainable forest management plans. Tree volume cannot be measured directly. It is derived from the diameter at breast height, tree height and a so-called form factor, which reduces the volume of a cylinder to the actual tree form. In this paper, we test four different types of form factor functions (Pollanchütz, Short Swedish, Meyer and F. Evert) for estimating total merchantable timber volume of nine commercial tree species in Bhutan: <span style="font-style:italic;">Abies densa, Picea spinulosa</span>, <span style="font-style:italic;">Pinus wallichiana, Tsuga dumosa</span>, <span style="font-style:italic;">Pinus roxburghii</span>, <span style="font-style:italic;">Castanopsis tribuloides</span>, <span style="font-style:italic;">Quercus glauca, Quercus lanata</span> and <span style="font-style:italic;">Quercus lamellosa</span>. The data for fitting the form factor functions come from 395 felled trees. The resulting functions are evaluated using independent validation data. Fitted statistics for evaluation include: root mean square error and mean absolute deviation. Although all form factor functions performed similarly, we suggest that the Pollanschütz function because of its consistency in the estimated form factors for all tree species. The evaluation of the calibrated form factor functions by species exhibited consistent and unbiased predictions.</span>
      PubDate: 2016-09-09
       
 
 
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