Download or read book Relative Measure of Bulk Density to Characterize Compaction of Forest Soils Caused by Harvest written by and published by . This book was released on 2003 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forest soil productivity is often impaired as a result of compaction caused by machine traffic. One of the most cost effective means of assessing soil compaction involves determination of bulk density. This study evaluates the usefulness of comparing field soil bulk density to the theoretical maximum bulk density determined by the Proctor compaction test. The study was carried out on existing Long-Term Soil Productivity sites in four British Columbia forest districts, long-term skid trail studies in the Kootenays, and root removal trials in the southern interior. The long-term sites were included in this study based on the availability of a complete record of soil bulk density & tree growth data. The maximum value along with previously determined field bulk density were used to determine a relative soil bulk density for 93 samples. Soil texture & total carbon were also determined on the samples collected, and the relationship between relative bulk density and tree growth was investigated.
Download or read book Relative Bulk Density as an Index of Soil Compaction and Forest Productivity in British Columbia written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil compaction often limits conifer regeneration on sites degraded by construction of landings and roads, but inadequate understanding of compaction characteristics has sometimes led to inappropriate rehabilitation efforts. This warrants development of new methods to assess compaction and its relation to tree growth. The objective of this study was to develop a high-level integration indicator that will characterize compaction of forest soils and that could be correlated to tree height growth. Mineral particle density of soils from interior British Columbia (BC) forests varied significantly among the geographic locations. Oxalate-extractable Fe- and Al-oxides and particle size distribution (PSD) were related to soil and mineral particle densities, while soil organic matter (SOM) and Al- and Fe-oxides were important soil properties in relation to soil particle density. The significance of levels of single soil properties in predicting maximum bulk density (MBD) were in the order: plastic and liquid limits, organic matter content, oxalate-extractable oxide, and PSD. Stratification of the sample according to Atterberg limits improved the predictability of MBD, and variation in particle density was included in the prediction by other soil properties used in the models. Height growth of interior Douglas-fir (Pseudotsuga menziesii var. glauca [Bessin] Franco) was restricted when relative bulk density (RBD) was> 0.72. For lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) and hybrid white spruce (Picea glauca [Moench] Voss × engelmannii Parry ex Engelm.), an RBD of 0.60 - 0.63 corresponded to maximum height growth, while that of 0.78 - 0.84 appeared to limit height growth. The presence of surface organic material mitigated compaction and was often associated with lower RBD. Interior Douglas-fir and lodgepole pine planted in low elevation sites in north-central BC did not grow well and their height growth was weakly related to RBD. The results suggest.
Download or read book Juvenile Tree Growth on Some Volcanic Ash Soils Disturbed by Prior Forest Harvest written by J. Michael Geist and published by . This book was released on 2008 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relative density written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physiological Ecology of Woody Plants written by Theodore T. Kozlowski and published by Academic Press. This book was released on 2012-12-02 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: The efficient management of trees and other woody plants can be improved given an understanding of the physiological processes that control growth, the complex environmental factors that influence those processes, and our ability to regulate and maintain environmental conditions that facilitate growth. Emphasizes genetic and environmental interactions that influence woody plant growth Outlines responses of individual trees and tree communities to environmental stress Explores cultural practices useful for efficient management of shade, forest, and fruit trees, woody vines, and shrubs
Download or read book Comparing Silvicultural Systems in a Coastal Montane Forest written by Eric J. Phillips and published by Canadian Forest Service. This book was released on 1996 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes a study in which three alternative silvicultural systems, representing a range of canopy removal levels, were implemented in a research area on eastern Vancouver Island. The three nine-hectare treatments (uniform shelterwood, green tree retention, patch cutting) were replicated three times. The study also included and old growth and a clear-cut control block. Harvesting was completed in 1993 and post-harvest studies will continue for another 20 years. Investigators monitored the productivity and cost of the falling and forwarding operations, and measured site disturbance and coarse woody debris for each harvesting treatment.
Download or read book Special Report written by and published by . This book was released on 1996 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Physical Measurement and Interpretation for Land Evaluation written by Keppel Coughlan and published by CSIRO PUBLISHING. This book was released on 2002-11-26 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil physical measurements are essential for solving many natural resource management problems. This operational laboratory and field handbook provides, for the first time, a standard set of methods that are cost-effective and well suited to land resource survey. It provides: *practical guidelines on the soil physical measurements across a range of soils, climates and land uses; *straightforward descriptions for each method (including common pitfalls) that can be applied by people with a rudimentary knowledge of soil physics, and *guidelines on the interpretation of results and integration with land resource assessment. Soil Physical Measurement And Interpretation for Land Evaluation begins with an introduction to land evaluation and then outlines procedures for field sampling. Twenty detailed chapters cover pore space relations, water retention, hydraulic conductivity, water table depth, dispersion, aggregation, particle size, shrinkage, Atterburg limits and strength. The book includes procedures for estimating soil physical properties from more readily available data and shows how soil physical data can be integrated into land planning and management decisions.
Download or read book FRDA Report written by and published by . This book was released on 1996 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subsoil Compaction written by Rainer Horn and published by . This book was released on 2000 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Teory; Modelling; Properties; Distribution; Methods.
Download or read book Forest Economics written by Daowei Zhang and published by UBC Press. This book was released on 2011-09-15 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forestry cannot be isolated from the forces that drive all economic activity. It involves using land, labour, and capital to produce goods and services from forests, while economics helps in understanding how this can be done in ways that will best meet the needs of people. Therefore, a firm grounding in economics is integral to sound forestry policies and practices. This book, a major revision and expansion of Peter H. Pearse’s 1990 classic, provides this grounding. Updated and enhanced with advanced empirical presentation of materials, it covers the basic economic principles and concepts and their application to modern forest management and policy issues. Forest Economics draws on the strengths of two of the field’s leading practitioners who have more than fifty years of combined experience in teaching forest economics in the United States and Canada. Its comprehensive and systematic analysis of forest issues makes it an indispensable resource for students and practitioners of forest management, natural resource conservation, and environmental studies.
Download or read book General Technical Report NE written by and published by . This book was released on 1980 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990 with total page 1254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dictionary of Natural Resource Management written by Katherine Dunster and published by UBC Press. This book was released on 2011-11-01 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most up-to-date and comprehensive reference work available, Dictionary of Natural Resource Management provides a single source of definitions of natural resource management terms. It includes more than 6,000 entries, many of them illustrated and annotated, and a detailed set of appendices covering conversion factors, geological time scales, and classifications of organisms.
Download or read book Root Ecology written by Hans de Kroon and published by Springer Science & Business Media. This book was released on 2003-05-21 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the course of evolution, a great variety of root systems have learned to overcome the many physical, biochemical and biological problems brought about by soil. This development has made them a fascinating object of scientific study. This volume gives an overview of how roots have adapted to the soil environment and which roles they play in the soil ecosystem. The text describes the form and function of roots, their temporal and spatial distribution, and their turnover rate in various ecosystems. Subsequently, a physiological background is provided for basic functions, such as carbon acquisition, water and solute movement, and for their responses to three major abiotic stresses, i.e. hard soil structure, drought and flooding. The volume concludes with the interactions of roots with other organisms of the complex soil ecosystem, including symbiosis, competition, and the function of roots as a food source.
Download or read book Soils as a Key Component of the Critical Zone 1 written by Jacques Berthelin and published by John Wiley & Sons. This book was released on 2018-10-16 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introductory book to the six volume series includes an introduction defining the critical zone for mankind that extends from tree canopy and the lower atmosphere to water table and unweathered rock. Soils play a crucial role through the functions and the services that they provide to mankind. The spatial and temporal variability of soils is represented by information systems whose importance, recent evolutions and increasingly performing applications in France and in the world must be underlined. The soil functions, discussed in this book, focus on the regulation of the water cycle, biophysicochemical cycles and the habitat role of biodiversity. The main services presented are those related to the provision of agricultural, fodder and forest products, energy, as well as materials and the role of soil as infrastructure support. They also include the different cultural dimensions of soils, their representations being often linked to myths and rites, as well as their values of environmental and archaeological records. Finally, the issue is raised of an off-ground world.
Download or read book Research Paper PNW written by and published by . This book was released on 1978 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
