Download or read book Predicting the Productivity of Sitka Spruce on Upland Sites in Northern Britain written by R. Worrell and published by Bernan Press(PA). This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Predicting the Productivity of Sitka Spruce on Upland Sites in Northern Britain written by R. Worrell and published by Bernan Press(PA). This book was released on 1987 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geographical Variation in Sitka Spruce Productivity and Its Dependence on Environmental Factors written by Richard V. Worrell and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Nutrition of Sitka Spruce on Upland Sites in Northern Britain written by Stephen A. Smith and published by . This book was released on 2002 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nutrition of Sitka Spruce on Upland Restock Sites in Northern Britain written by Stephen Alistair Smith and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on Forest Research written by Great Britain. Forestry Commission and published by . This book was released on 1993 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Forest Research written by and published by . This book was released on 2011 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on Forest Research written by and published by . This book was released on 1990 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quarterly Journal of Forestry written by and published by . This book was released on 1999 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vol. 1 includes the Transactions of the Irish Forestry Society.
Download or read book The Arboricultural Journal written by and published by . This book was released on 1988 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Economics of Sustainability written by John C.V. Pezzey and published by Routledge. This book was released on 2017-09-08 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: Before the late 1980s, when the ideas of sustainability and sustainable development to the forefront of public debate, conventional, neo-classical economic thinking about development and growth had rarely given any consideration to the needs of future generations, or the sustainability of natural resource use. Defining sustainability broadly as intergenerational fairness in the long-term decision making of a whole society, and using established economic concepts, this selection of refereed journal articles brings a famously ill-defined concept into sharp focus, providing academics at all levels with a formidable research tool. Spanning thirty years of the most important philosophical, theoretical and empirical contributions from both critics and defenders of neo-classical assumptions and methods of economic analysis, this focused collection of papers constitutes a unique, balanced resource on the full range of intellectual debates surrounding the economics of sustainability.
Download or read book Research Information Note written by and published by . This book was released on 1991 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Commonwealth Forestry Review written by and published by . This book was released on 1988 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forestry Practice written by Great Britain. Forestry Commission and published by . This book was released on 1991 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This latest edition of Forestry Practice takes into account the considerable advances and changes in silviculture during the last five years. This includes a new chapter devoted to planning for second rotation plantations and greater coverage of existing woodland maintenance. It sets out the entire sequence of operations from plant propagation to final felling and restocking. Environmental issues are also taken into account with guidance on wildlife management and conservation, landscape design and recreation planning.
Download or read book Forestry Commission Bulletin written by and published by . This book was released on 1969 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Super Sitka for the 90s written by Great Britain. Forestry Commission and published by . This book was released on 1992 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 50 per cent of current planting of upland forest in the UK is Sitka spruce. Major areas of research on this species has sought to increase growth rates and timber yields, mainly through making genetically improved planting stock available to the forest grower. This publication is comprised of edited presentations made at a meeting in Elgin in 1990. Each paper addresses a separate issue relevant to the development of one of the most important species in upland forestry at the present time.
Download or read book Forest Health written by John L. Innes and published by Oxford University Press, USA. This book was released on 1993 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book assesses the current state of knowledge about forest declines, particularly as they relate to air pollution. Many declines are shown to be unrelated to air pollution and, in other cases, the links between air pollution and the condition of the trees is extremely tenuous. Factors such as nutrient depletion due to past management practices and drought are shown to have had a major influence on the health of trees. In many cases, the evidence for a decline in tree condition is at best ambiguous, and much of the concern appears to have been generated by political and media interest rather than by a critical evaluation of the available data. A detailed examination of the comprehensive data collected in the British forest health monitoring program over the last five years indicates the complexity of the process involved and illustrates the dangers of taking data from a single year at face value. Many of the indices used to assess trees are of questionable value when compared over time or space, as their subjective nature precludes any reliable comparisons. Studies of annual increment and wood quality indicate that the international market for timber is unlikely to be affected in either the long or the short term.
