Geographical Variation In Sitka Spruce Productivity And Its Dependence On Environmental Factors
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Geographical Variation In Sitka Spruce Productivity And Its Dependence On Environmental Factors
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Author : Richard V. Worrell
language : en
Publisher:
Release Date : 1987
Geographical Variation In Sitka Spruce Productivity And Its Dependence On Environmental Factors written by Richard V. Worrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Sitka spruce categories.
Geographical Variation In Sitka Spruce Productivity And Its Dependence On Environmental Factors
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Author : Richard V. Worrell
language : en
Publisher:
Release Date : 1987
Geographical Variation In Sitka Spruce Productivity And Its Dependence On Environmental Factors written by Richard V. Worrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Sitka spruce categories.
The objective of this study was to investigate altitudinal and geographical variation in the productivity of Sitka spruce in upland Scotland, to relate this to environmental variables and to use the information to develop a basis for predicting Sitka spruce yield form site factors. A total of 188 0.04 ha temporary sample plots were established in 15 to 50 year old Sitka spruce stands at 37 sites in Scotland and northern England, mostly spanning the upper 200m elevation range of plantations. At each plot estimates of General Yield Class (GYC) were made and the following site factors were assessed; elevation, geomorphic shelter (topex), aspect, slope, soil type and rooting depth. In addition, estimates of wind-climate, mean summer temperature (June-September), mean annual accumulated temperature > 5.6°C and annual rainfall were made by extrapolation of forestry Commission "tatter flag" records and Meteorological Office data. GYC declined by about 3.2 - 4.0 m3 ha -1 yr -1 per 100 m increase in elevation due to the effects of increasingly adverse climatic and edaphic conditions, GYC was fairly closely correlated with elevation at the individual sites, but there was considerable site to site variation. GYC values at specific elevations were higher in inland and southern areas than in coastal and northern ones. The geographical pattern of the relationship between GYC and elevation was strikingly similar to the distributions of growing season temperatures and wind-climate. Correlation and multiple regression analysis demonstrated that GYC was well correlated with extrapolated values of accumulated temperature and tatter rate, these two variables accounting for up to 78 per cent of the variation in GYC in the best multiple regression models. GYC also proved to be correlated with aspect, topex, soil type and crop age. Productivity was highest on north and east-facing aspects and increased with greater levels of geomorphic shelter. Differences in soil type only accounted for a small amount of variation in GYC (2-3 per cent). GYC was significantly negatively correlated with crop age, probably as a result of improved standards of silvicultural treatment. The best multiple regression models accounted for 78-86 per cent of the variation in GYC and were associated with confidence limits of ±2.2 - 2.6 m3 ha -1 yr -1. The mean figure for predicting GYC for a single site (acquisition) was calculated to be ± m3 ha -1 yr -1, and this figure was confirmed by results of a validation survey. The information presented could easily be adapted for predicting productivity and assessing suitable upper planting limits in practical forestry.
Environmental Factors And The Growth Of Sitka Spruce
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Author : Douglas C. Malcolm
language : en
Publisher:
Release Date : 1969
Environmental Factors And The Growth Of Sitka Spruce written by Douglas C. Malcolm and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Sitka spruce categories.
Forest Development In Cold Climates
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Author : John Alden
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Forest Development In Cold Climates written by John Alden and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.
As forests decline in temperate and tropical climates, highly-developed countries and those striving for greater economic and social benefits are beginning to utilize marginal forests of high-latitude and mountainous regions for resources to satisfy human needs. The benefits of marginal forests range from purely aesthetic to providing resources for producing many goods and services demanded by a growing world population. Increased demands for forest resources and amenities and recent warming of high latitude climates have generated interest in reforestation and afforestation of marginal habitats in cold regions. Afforestation of treeless landscapes improves the environment for human habitation and provides for land use and economic prosperity. Trees are frequently planted in cold climates to rehabilitate denuded sites, for the amenity of homes and villages, and for wind shelter, recreation, agroforestry, and industrial uses. In addition, forests in cold climates reduce the albedo of the earth's surface in winter, and in summer they are small but significant long-lived sinks for atmospheric carbon dioxide. Finally, growth and reproductive success of forests at their geographic limits are sensitive indices of climatic change. As efforts to adapt forests to cold climates increase, however, new afforestation problems arise and old ones intensify. Austral, northern, and altitudinal tree limits are determined by many different factors. Current hypotheses for high-latitude tree limits are based on low growing-season temperatures that inhibit plant development and reproduction.
Predicting The Productivity Of Sitka Spruce On Upland Sites In Northern Britain
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Author : R. Worrell
language : en
Publisher: Bernan Press(PA)
Release Date : 1987
Predicting The Productivity Of Sitka Spruce On Upland Sites In Northern Britain written by R. Worrell and has been published by Bernan Press(PA) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Nature categories.
Proceedings
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Author :
language : en
Publisher:
Release Date : 1987
Proceedings written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Biology categories.
Forestry Commission Bulletin
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Author :
language : en
Publisher:
Release Date : 1969
Forestry Commission Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Forests and forestry categories.
Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards
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Author :
language : en
Publisher:
Release Date : 2007
Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Dissertations, Academic categories.
Scottish Forestry
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Author :
language : en
Publisher:
Release Date : 2003
Scottish Forestry written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Forests and forestry categories.
British Reports Translations And Theses
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Author : British Library. Document Supply Centre
language : en
Publisher:
Release Date : 1988
British Reports Translations And Theses written by British Library. Document Supply Centre and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Dissertations, Academic categories.