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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: 59, SJR: 1.512, h-index: 46)
Age and Ageing     Hybrid Journal   (Followers: 85, SJR: 1.611, h-index: 107)
Alcohol and Alcoholism     Hybrid Journal   (Followers: 16, SJR: 0.935, h-index: 80)
American Entomologist     Full-text available via subscription   (Followers: 6)
American Historical Review     Hybrid Journal   (Followers: 139, SJR: 0.652, h-index: 43)
American J. of Agricultural Economics     Hybrid Journal   (Followers: 40, SJR: 1.441, h-index: 77)
American J. of Epidemiology     Hybrid Journal   (Followers: 171, SJR: 3.047, h-index: 201)
American J. of Hypertension     Hybrid Journal   (Followers: 23, SJR: 1.397, h-index: 111)
American J. of Jurisprudence     Hybrid Journal   (Followers: 17)
American J. of Legal History     Full-text available via subscription   (Followers: 6, SJR: 0.151, h-index: 7)
American Law and Economics Review     Hybrid Journal   (Followers: 25, SJR: 0.824, h-index: 23)
American Literary History     Hybrid Journal   (Followers: 12, SJR: 0.185, h-index: 22)
Analysis     Hybrid Journal   (Followers: 23)
Annals of Botany     Hybrid Journal   (Followers: 36, SJR: 1.912, h-index: 124)
Annals of Occupational Hygiene     Hybrid Journal   (Followers: 28, SJR: 0.837, h-index: 57)
Annals of Oncology     Hybrid Journal   (Followers: 49, 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: 20)
Arbitration Law Reports and Review     Hybrid Journal   (Followers: 13)
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: 49, SJR: 1.698, h-index: 92)
Bioinformatics     Hybrid Journal   (Followers: 304, 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: 30, 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: 148, SJR: 2.314, h-index: 133)
BJA Education     Hybrid Journal   (Followers: 64, SJR: 0.272, h-index: 20)
Brain     Hybrid Journal   (Followers: 61, SJR: 6.097, h-index: 264)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 44, 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: 34, SJR: 1.267, h-index: 38)
British J. of Aesthetics     Hybrid Journal   (Followers: 26, SJR: 0.217, h-index: 18)
British J. of Criminology     Hybrid Journal   (Followers: 527, SJR: 1.373, h-index: 62)
British J. of Social Work     Hybrid Journal   (Followers: 83, 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: 27)
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3, SJR: 1.474, h-index: 31)
Cambridge J. of Economics     Hybrid Journal   (Followers: 58, SJR: 0.957, h-index: 59)
Cambridge J. of Regions, Economy and Society     Hybrid Journal   (Followers: 11, SJR: 1.067, h-index: 22)
Cambridge Quarterly     Hybrid Journal   (Followers: 11, SJR: 0.1, h-index: 7)
Capital Markets Law J.     Hybrid Journal   (Followers: 1)
Carcinogenesis     Hybrid Journal   (Followers: 2, SJR: 2.439, h-index: 167)
Cardiovascular Research     Hybrid Journal   (Followers: 12, SJR: 2.897, h-index: 175)
Cerebral Cortex     Hybrid Journal   (Followers: 41, 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: 21, SJR: 0.737, h-index: 11)
Chinese J. of Intl. Politics     Hybrid Journal   (Followers: 9, 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: 24, 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: 7, 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: 5, SJR: 0.313, h-index: 10)
Critical Values     Full-text available via subscription  
Current Legal Problems     Hybrid Journal   (Followers: 26)
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: 19, 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: 15, SJR: 0.124, h-index: 11)
Economic Policy     Hybrid Journal   (Followers: 63, SJR: 2.052, h-index: 52)
ELT J.     Hybrid Journal   (Followers: 25, SJR: 1.26, h-index: 23)
English Historical Review     Hybrid Journal   (Followers: 51, SJR: 0.311, h-index: 10)
English: J. of the English Association     Hybrid Journal   (Followers: 13, 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: 26, SJR: 0.197, h-index: 25)
EP-Europace     Hybrid Journal   (Followers: 2, SJR: 2.201, h-index: 71)
Epidemiologic Reviews     Hybrid Journal   (Followers: 10, SJR: 3.917, h-index: 81)
ESHRE Monographs     Hybrid Journal  
Essays in Criticism     Hybrid Journal   (Followers: 16, SJR: 0.1, h-index: 6)
European Heart J.     Hybrid Journal   (Followers: 49, SJR: 6.997, h-index: 227)
European Heart J. - Cardiovascular Imaging     Hybrid Journal   (Followers: 8, 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: 7, SJR: 0.152, h-index: 31)
European J. of Cardio-Thoracic Surgery     Hybrid Journal   (Followers: 8, SJR: 1.568, h-index: 104)
European J. of Intl. Law     Hybrid Journal   (Followers: 160, 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: 11, SJR: 1.549, h-index: 42)
European Review of Economic History     Hybrid Journal   (Followers: 28, SJR: 0.628, h-index: 24)
European Sociological Review     Hybrid Journal   (Followers: 41, SJR: 2.061, h-index: 53)
Evolution, Medicine, and Public Health     Open Access   (Followers: 11)
Family Practice     Hybrid Journal   (Followers: 11, SJR: 1.048, h-index: 77)
Fems Microbiology Ecology     Hybrid Journal   (Followers: 9, 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: 22, 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: 32, SJR: 0.123, h-index: 10)
French Studies     Hybrid Journal   (Followers: 20, 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: 34, 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: 49, 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: 20, SJR: 1.628, h-index: 66)
Health Promotion Intl.     Hybrid Journal   (Followers: 21, 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: 24, SJR: 0.115, h-index: 13)
Human Molecular Genetics     Hybrid Journal   (Followers: 9, SJR: 4.288, h-index: 233)
Human Reproduction     Hybrid Journal   (Followers: 78, SJR: 2.271, h-index: 179)
Human Reproduction Update     Hybrid Journal   (Followers: 17, SJR: 4.678, h-index: 128)
Human Rights Law Review     Hybrid Journal   (Followers: 60, 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: 10)
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: 30, 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: 5, SJR: 0.743, h-index: 35)
Intl. Affairs     Hybrid Journal   (Followers: 52, SJR: 1.264, h-index: 53)
Intl. Data Privacy Law     Hybrid Journal   (Followers: 28)
Intl. Health     Hybrid Journal   (Followers: 5, 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: 33, SJR: 1.593, h-index: 69)
Intl. J. of Constitutional Law     Hybrid Journal   (Followers: 60, SJR: 0.613, h-index: 19)
Intl. J. of Epidemiology     Hybrid Journal   (Followers: 148, SJR: 4.381, h-index: 145)
Intl. J. of Law and Information Technology     Hybrid Journal   (Followers: 4, SJR: 0.247, h-index: 8)
Intl. J. of Law, Policy and the Family     Hybrid Journal   (Followers: 29, 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: 9, SJR: 0.906, h-index: 33)
Intl. J. of Refugee Law     Hybrid Journal   (Followers: 33, 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: 31, SJR: 1.339, h-index: 19)
Intl. Relations of the Asia-Pacific     Hybrid Journal   (Followers: 18, 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: 39, SJR: 2.184, h-index: 68)
Intl. Studies Review     Hybrid Journal   (Followers: 18, 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: 43, 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: 13, 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: 43, 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: 35, 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: 13, SJR: 0.196, h-index: 15)
J. of Consumer Research     Full-text available via subscription   (Followers: 43, SJR: 4.896, h-index: 121)
J. of Crohn's and Colitis     Hybrid Journal   (Followers: 10, SJR: 1.543, h-index: 37)
J. of Cybersecurity     Hybrid Journal   (Followers: 3)
J. of Deaf Studies and Deaf Education     Hybrid Journal   (Followers: 9, SJR: 0.69, h-index: 36)
J. of Design History     Hybrid Journal   (Followers: 16, 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: 39, 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: 23, SJR: 1.314, h-index: 27)
J. of Global Security Studies     Hybrid Journal   (Followers: 3)
J. of Heredity     Hybrid Journal   (Followers: 4, 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: 39, SJR: 4, h-index: 209)
J. of Insect Science     Open Access   (Followers: 8, 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]
  • Estimating stand density, biomass and tree species from very high
           resolution stereo-imagery – towards an all-in-one sensor for forestry
           applications'
    • Authors: Fassnacht F; Mangold D, Schäfer J, et al.
      Pages: 613 - 631
      Abstract: AbstractThe estimation of various forest inventory attributes from high spatial resolution airborne remote sensing data has been widely examined and proved to be successful at the experimental level. Nevertheless, the operational use of these data in automated procedures to support forest inventories and forest management is still limited to a small number of cases. The reasons for this are high data costs, limited availability of remote sensing data over large areas and resistance from practitioners. In this review the main aim is to stimulate debate about spaceborne very high resolution stereo-imagery (VHRSI) as an alternative to airborne remote sensing data by presenting: (1) a case study on the retrieval of stand density, aboveground biomass and tree species using a set of easy-to-calculate variables obtained from VHRSI data combined with image processing and nonparametric classification and modelling approaches; and (2) the results of an expert opinion survey on the potential of VHRSI as compared with Light Detection and Ranging (LiDAR), hyperspectral and airborne digital imagery to derive a range of forest inventory attributes. In the case study, stand density was estimated with r² = 0.71 and RMSE = 156 trees (rel./norm. RMSE = 24.9 per cent/12.4 per cent), biomass with r² = 0.64 and RMSE of 36.7 t/ha (rel./norm. RMSE = 20.0 per cent/12.8 per cent) while tree species classifications with five species reached overall accuracies of 84.2 per cent (kappa = 0.81). These results were comparable to earlier studies in the same test site, obtained with more expensive airborne acquisitions. Expert opinions were more diverse for VHRSI and aerial photographs (Shannon index values of 0.94 and 0.97) than for LiDAR and hyperspectral data (Shannon index values 0.69 and 0.88). In our opinion, this reflects the current state-of-the-art in the application of VHRSI for automatically retrieving forest inventory attributes. The number of studies using these data is still limited, and the full potential of these datasets is not yet completely explored. Compared with LiDAR and hyperspectral data, which both mostly received high scores for forest inventory products matching the sensor systems’ strengths, VHRSI and aerial photographs received more homogeneous scores indicating their potential as multi-purpose instruments to collect forest inventory information. In summary, considering the simpler acquisition, reasonable price and the comparably easy data format and handling of VHRSI compared with other sensor types, we recommend further research on the application of these data for supporting operational forest inventories.
      PubDate: 2017-03-24
      DOI: 10.1093/forestry/cpx014
      Issue No: Vol. 90, No. 5 (2017)
       
  • Ecosystem services to enhance sustainable forest management in the US:
           moving from forest service national programmes to local projects in the
           Pacific Northwest
    • Authors: Deal R; Smith N, Gates J.
      Pages: 632 - 639
      Abstract: AbstractEcosystem services are increasingly recognized as a way of framing and describing the broad suite of benefits that people receive from forests. The USDA Forest Service has been exploring use of an ecosystem services framework to describe forest values provided by federal lands and to attract and build partnerships with stakeholders to implement projects. Recently, the agency has sought placed-based applications of the ecosystem services framework to national forest management to better illustrate the concept for policymakers, managers and forest stakeholders. This framework includes describing the ecosystem services provided by forest landscapes, examining the potential trade-offs among services associated with proposed management activities, and attracting and building partnerships with stakeholders who benefit from particular services forests provide. Projects that describe objectives and outcomes using an ecosystem services framework are quickly gaining respect and could provide an optimal method of managing forests to better serve the needs of people. We describe how project-scale guidelines can be designed to address commonly recognized products such as timber and clean water, as well as critical regulating, supporting and cultural services. We present results from national programmes to forest plan assessments to project-scale applications that enhance the provision of ecosystem services and sustainable forest management at broad to local scales.
      PubDate: 2017-05-25
      DOI: 10.1093/forestry/cpx025
      Issue No: Vol. 90, No. 5 (2017)
       
  • Ingestion of infected roots by feral pigs provides a minor vector pathway
           for kauri dieback disease Phytophthora agathidicida
    • Authors: Bassett IE; Horner IJ, Hough EG, et al.
      Pages: 640 - 648
      Abstract: AbstractIdentifying vectors of soil-borne forest pathogens is crucial in limiting disease spread. Phytophthora agathidicida causes kauri dieback disease, killing kauri (Agathis australis (D.Don) Lindl.), Aotearoa-New Zealand's largest endemic tree. Currently incurable, management focuses on spread prevention. Feral pigs (Sus scrofa) are implicated in spread, through ingestion of infected material; congeneric Phytophthora cinnamomi is known to survive pig gut passage. We investigated P. agathidicida survival of pig gut passage in a captive feeding experiment, and assessed P. agathidicida incidence in feral pig stomachs from DNA. We detected viable P. agathidicida from a kauri root retrieved from captive-fed pig faeces, providing proof of concept that pigs can internally vector P. agathidicida. However, we detected only one positive, despite processing a total of 11.2 m of passaged roots and 800 millet (Pennisetum glaucum (L.) R.Br.) seeds, from 12 pigs. We did not detect P. agathidicida in any of 184 wild-caught feral pig stomachs, but did detect five other Phytophthora species including P. multivora and P. cinnamomi. Ingestion of contaminated material by feral pigs is probably a minor pathway for P. agathidicida, and a higher risk pathway for P. cinnamomi. We highlight the need to test Phytophthora species individually, as pathways of spread may be considerably different between related species.
      PubDate: 2017-04-12
      DOI: 10.1093/forestry/cpx019
      Issue No: Vol. 90, No. 5 (2017)
       
  • Big BAF sampling in mixed species forest structures of northeastern North
           America: influence of count and measure BAF under cost constraints
    • Authors: Yang T; Hsu Y, Kershaw J, et al.
      Pages: 649 - 660
      Abstract: AbstractAn efficient sampling design for forest inventory is important to collect the basic measurements required to estimate stand volume and describe forest structure. For operational forest inventory, efficient sampling designs often are constrained not only by standard error objectives, but also by cost constraints. So, sampling designs must consider a balance between objectives and constraints. Big basal area factor (BAF) sampling incorporates subsampling into horizontal point sampling by using two angle gauges: one to select count trees (small BAF) and one to select measure trees (big BAF). Big BAF sampling focuses inventory effort on counts, which tend to be more variable than volume:basal area (VBAR) measures, and greatly improves sample efficiency. However, big BAF sampling is not widely employed because forest inventory specialists do not fully understand the relationships among sampling error, sample size and field costs. In this study, we show the impact of count BAF and measure BAF on sampling error and sample size requirements, and develop methods to optimize choice of count and measure BAF when inventory expenditures are constrained. Our results show that when the variability in VBAR is low, count BAF limits sample design options, and as VBAR variability increases, measure BAF becomes the limiting design factor. We also found that efficient sample design is more critical when inventory resources are limited than when inventory resources are more abundant.
      PubDate: 2017-04-24
      DOI: 10.1093/forestry/cpx020
      Issue No: Vol. 90, No. 5 (2017)
       
  • Generalized allometric equations of total volume generated by
           meta-analysis for roble, raulí and coigüe in second growth forests in
           Chile
    • Authors: Valenzuela C; Acuña E, Muñoz F, et al.
      Pages: 661 - 674
      Abstract: AbstractA modified meta-analysis was used to develop generalized allometric equations of total individual volume underbark for second growth forests of roble, raulí and coigüe. From a set of total volume equations compiled from the literature, pseudo-data were generated to fit generalized equations for each species. The meta-analysis was supplemented with an observed database, which, besides contributing data for validation was used to fit the height–diameter relationship and to model the variance of total volume. This variance was used to simulate random pseudo-data of volume with variability similar to that of the observed data, in order to avoid residual autocorrelation problems. It was also used to define weights for the fitting of volume equations. In order to determine zonal effects, volume equations compiled from the literature were assigned to agro-climatic zones defined by ODEPA (ODEPA. 2000 Oficinas De Estudios y Políticas Agrarias. Clasificación de las explotaciones agrícolas del VI censo nacional agropecuario según tipo de productor y localización geográfica. Ministerio de Agricultura. Documento de trabajo N°5. I.S.S.N. 0717-0378. Santiago, Chile. 91 p.), according to the location of the sample. In the fitting, which included dummy variables, no significant zonal effects were detected in the regression parameters in any of the species. The generalized allometric equations of total volume showed highly precision and accuracy, i.e. FI < 0.0852 m3 tree−1 and E < 0.0674 m3 tree−1. Thus, obtained equations are considered valid for widespread use in the study zones.
      PubDate: 2017-05-03
      DOI: 10.1093/forestry/cpx021
      Issue No: Vol. 90, No. 5 (2017)
       
  • Model-dependent forest stand-level inference with and without estimates of
           stand-effects
    • Authors: Magnussen S; Breidenbach J.
      Pages: 675 - 685
      Abstract: AbstractForest stands are important units of management. A stand-by-stand estimation of the mean and variance of an attribute of interest (Y) remains a priority in forest enterprise inventories. The advent of powerful and cost effective remotely sensed auxiliary variables (X) correlated with Y means that a census of X in the forest enterprise is increasingly available. In combination with a probability sample of Y, the census affords a model-dependent stand-level inference. It is important, however, that the sampling design affords an estimation of possible stand-effects in the model linking X to Y. We demonstrate, with simulated data, that failing to quantify non-zero stand-effects in the intercept of a linear population-level model can lead to a serious underestimation of the uncertainty in a model-dependent estimate of a stand mean, and by extension a confidence interval with poor coverage. We also provide an approximation to the variance of stand-effects in an intercept for the case when a sampling design does not afford estimation. Furthermore, we propose a method to correct a potential negative bias in an estimate of the variance of stand-effects when a sampling design prescribes few stands with small within-stand sample sizes.
      PubDate: 2017-05-22
      DOI: 10.1093/forestry/cpx023
      Issue No: Vol. 90, No. 5 (2017)
       
  • Area-based estimation of growing stock volume in Scots pine stands using
           ALS and airborne image-based point clouds
    • Authors: Hawryło P; Tompalski P, Wężyk P.
      Pages: 686 - 696
      Abstract: AbstractRecent research has shown that image-derived point clouds (IPCs) are a highly competitive alternative to airborne laser scanning (ALS) data in the context of selected forest inventory activities. However, there is still a need for investigating different kinds of aerial images used for point cloud generation. This study compares the effectiveness of IPCs derived from true colour (RGB) and colour infrared (CIR) aerial images with ALS data for growing stock volume estimation of single canopy layer Scots pine stands. A multiple linear regression method was used to create predictive models. All models predicted growing stock volume with low root mean square errors – ALS: 15.2%, IPC-CIR: 17.0% and IPC-RGB: 17.5%. The following variables for each data type were found to be the most robust: ALS – mean height of points, percentage of all returns above mean height of points, interquartile range of point heights; IPC-CIR – mean height of points, percentage of all returns above mode height of points, canopy relief ratio; IPC-RGB – mean height of points and canopy relief ratio. Our results show that for single canopy layer Scots pine dominated stands it is possible to predict growing stock volume using IPCs with a comparable accuracy as using ALS data. The comparable performance of IPC-RGB and IPC-CIR based models suggests that a mixed usage of RGB and CIR data in retrospective studies could be possible.
      PubDate: 2017-05-25
      DOI: 10.1093/forestry/cpx026
      Issue No: Vol. 90, No. 5 (2017)
       
  • Optimal sample size and plot size or point sampling factor based on
           cost-plus-loss using the Fairfield Smith relationship for plot size
    • Authors: Lynch T.
      Pages: 697 - 709
      Abstract: AbstractThe principle of minimizing the cost-plus-loss is used to simultaneously find optimal plot size and sample size for forest sampling using the Fairfield Smith relationship between plot size and the variance among cubic metre volumes per hectare. Loss is defined as the United States Dollar (USD) value of the expected value of the absolute value of the difference between the sample mean and true mean volumes per hectare. Under the assumption of a normal distribution, this loss is a function of the standard error of the mean. Sampling costs include USD values of fixed costs, plot measurement and establishment costs and travel costs; however, fixed costs do not affect the determination of minimum cost-plus-loss. By differentiating the cost-plus-loss function with respect to plot and sample size, equations are derived that can be used to determine plot and sample sizes that minimize cost-plus-loss. Example solutions for fixed-sized plot and point sampling are presented using costs and stumpage values typical for the southern USA. These examples indicate that the cost-plus-loss criterion results in higher rates of sampling intensity than would be typical for the southern USA for the example scenarios. However, since sampling costs under the cost-plus-loss criterion were only around half a percent of timber value, the cost-plus-loss sampling plans might be justified in cases where very precise valuations are required.
      PubDate: 2017-05-25
      DOI: 10.1093/forestry/cpx024
      Issue No: Vol. 90, No. 5 (2017)
       
  • Digital aerial photogrammetry can efficiently support large-area forest
           inventories in Norway
    • Authors: Rahlf J; Breidenbach J, Solberg S, et al.
      Pages: 710 - 718
      Abstract: AbstractThe use of digital aerial photogrammetry (DAP) for forest inventory purposes has been widely studied and can produce comparable accuracy compared with airborne laser scanning (ALS) in small, homogeneous areas. However, the accuracy of DAP for large scale applications with heterogeneous terrain and forest vegetation has not yet been reported. In this study we examined the accuracy of timber volume, biomass and basal area prediction models based on DAP and national forest inventory (NFI) data on a large area in central Norway. Two separate point clouds were derived from aerial image acquisitions of 2010 and 2013. Vegetation heights were extracted by subtracting terrain elevation derived from ALS. A large number of NFI sample plots (483) measured between 2010 and 2014 were used as reference data to fit linear models for timber volume, biomass and basal area with height metrics derived from the DAP data as explanatory variables. Variables describing the heterogeneous environmental and image acquisition conditions were calculated and their influence on the model accuracy was tested. The results showed that forest parameter prediction using DAP works well when applied to a large area. The model fits of the timber volume, biomass and basal area models were good with R2 of 0.80, 0.81, 0.81 and RMSEs of 41.43 m3 ha−1 (55% of the mean observed value), 32.49 t ha−1 (47%), 5.19 m2 ha−1 (41%), respectively. Only a small proportion of the variation could be attributed to the heterogeneous conditions. The inclusion of the relative sun inclination led to an improvement of the model RMSEs by 2% of the mean observed values. The relatively low cost and stability across large areas make DAP an attractive source of auxiliary information for large scale forest inventories.
      PubDate: 2017-06-15
      DOI: 10.1093/forestry/cpx027
      Issue No: Vol. 90, No. 5 (2017)
       
  • Using Ecoplugs containing glyphosate can be an effective method of killing
           standing trees
    • Authors: Willoughby I; Stokes V, Connolly T.
      Pages: 719 - 727
      Abstract: AbstractWhere trees need to be killed to improve the health, diversity or productivity of the remaining stand, the usual practice is to harvest them. However, if conventional harvesting and timber extraction is impractical or not economic, ‘felling to recycle’ (also referred to in the past as ‘felling to waste’ or ‘thinning to waste’), where the cut timber is left on site to degrade, is sometimes necessary. Our research investigated whether chemical thinning, which involves the killing of standing trees through the application of herbicides, might provide a more cost effective alternative to either manual ring barking or felling to recycle. We found that applying glyphosate in an encapsulated form as Ecoplug Max® at a rate of 0.068 g a.i. glyphosate per cm of stem diameter killed ~90 per cent of 47-year-old standing Douglas fir within two full growing seasons of treatment. Ecoplugs appeared to be a more effective method of applying glyphosate to kill standing trees than the traditional method of chemical thinning which involves spraying liquid glyphosate into cuts made in the tree stem. Both traditional chemical thinning and non-chemical ring barking were also moderately effective in our work, but the speed of kill was slower and overall efficacy lower than when using Ecoplugs. Ecoplugs may also have other advantages such as eliminating the risk of chemical drift and operator contamination, and providing the potential for year round application, but they are 300 per cent more expensive to use than traditional chemical thinning and 30 per cent more expensive than manual ring barking.
      PubDate: 2017-07-01
      DOI: 10.1093/forestry/cpx028
      Issue No: Vol. 90, No. 5 (2017)
       
  • The efficacy of chemical thinning treatments on Pinus sylvestris and Larix
           kaempferi and subsequent incidence and potential impact of Heterobasidion
           annosum infection in standing trees
    • Authors: Tubby KV; Willoughby IH, Forster J.
      Pages: 728 - 736
      Abstract: AbstractChemical thinning can be used where conventional felling and extraction of trees is impractical or uneconomic. An experiment was established to examine the efficacy of a range of thinning treatments and to investigate subsequent H. annosum infection on Scots pine and Japanese larch. Ring barking, traditional applications of liquid glyphosate and glyphosate encapsulated as Ecoplug Max® were compared. Ecoplugs were more effective and faster acting on larch compared with conventional glyphosate treatments, killing 100 per cent of trees within 17 months, whilst both glyphosate treatments killed 88 per cent of pines. Most treatments allowed ingress of Heterobasidion annosum, although this did not directly relate to treatment wound size. Persistence of the pathogen within the trees, and the possibility of using prophylactic fungicidal products alongside thinning treatments requires further study. Ultimately, the speed of kill achieved is probably too slow for defoliating trees infected with Phytophthora ramorum in Britain, where sanitation felling remains the recommended option. Where thinning treatments are used, the impacts of H. annosum infection are unlikely to be significantly greater than those represented by conventional harvesting operations but this possibility requires further study.
      PubDate: 2017-09-23
      DOI: 10.1093/forestry/cpx038
      Issue No: Vol. 90, No. 5 (2017)
       
 
 
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