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Book The Influence of Soil Compaction on Early Conifer Growth in the Southern Washington Cascades

Download or read book The Influence of Soil Compaction on Early Conifer Growth in the Southern Washington Cascades written by Richard William Robbins and published by . This book was released on 1983 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the effect of soil compaction on the growth of natural regeneration on volcanic ash-influenced soils in the southern Washington Cascades. Growth of 9 to 18 year-old sapling-. sized Ponderosa pine (Pinus ponderosa Laws.) was studied on sites ranging from 915 to 1006 m elevation in an area selectively logged in 1959, and for 10 to 13 year-old lodgepole pine (Pinus contorta Dougl.) established following a group selection harvest on a 1342 in elevation site logged in 1967. Soils ranged from loam to sandy loam texture. Height, diameter, and volume growth were measured for trees growing under an array of disturbance conditions to determine the influence of soil compaction on their size and growth rates. A number of soil, vegetation, and site variables were studied to determine possible cause and effect relationships with growth parameters. Bulk density of the surface 30.5 cm was measured within the lateral rooting zone to provide an index of compaction. Trees were destructively sampled to obtain a detailed record of their development, and to adjust for differences in age as a result of variable establishment delays. Average bulk density increases of 15.4 and 27.5 percent relative to adjacent undisturbed soil were found for skid trails in the ponderosa pine and lodgepole pine study areas, respectively. The effect of soil displacement overshadowed any possible relationship between bulk density and growth for lodgepole pine. The strong correlation of growth with organic matter content indicates that removal of nutrient-rich surface soil during logging and slash disposal operations may significantly affect site productivity, particularly for poorly developed skeletal soils. Regression analysis showed that several growth parameters for ponderosa p1ne were strongly associated with the increase in bulk density despite additional significant relationships with tree age, site index, and overstory cover. Reductions in total growth of 4.8, 7.7 and 20.4 percent were predicted for height, diameter, and stem volume of 14 year-old skid trail regeneration based on the mean bulk density increase. Evaluation of current growth increment was effective in adjusting for differences in tree age. Predicted average reductions in height, diameter, and volume growth of 7.1, 11.8, and 18.9 percent were estimated for young ponderosa pine based on the last five year period. Projected impacts from regression analysis represent conservative estimates, since the mean density increase used is the prediction model included measurements for sample trees growing in soil with bulk densities comparable to undisturbed levels. When the ponderosa pine sample was stratified into low and high impact groups based on bulk density increases, differences in the shape of height-age and diameter-age curves were apparent. A significant decrease in the rate of growth was noted for trees growing under highly disturbed conditions. Projected effects of compaction on site productivity throughout the rotation are difficult to assess, but measurable reductions in young tree growth coupled with frequent stand entries and the slow rate of natural soil recovery provide a basis for concern for long-term impacts.

Book Masters Theses in the Pure and Applied Sciences

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 29 (thesis year 1984) a total of 12,637 theses titles from 23 Canadian and 202 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 29 reports theses submitted in 1984, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Book Proceedings of the Society of American Foresters National Convention

Download or read book Proceedings of the Society of American Foresters National Convention written by Society of American Foresters. Convention and published by . This book was released on 1985 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Foresters Future

Download or read book Foresters Future written by Society of American Foresters. Convention and published by . This book was released on 1985 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Research Bulletin

Download or read book Research Bulletin written by and published by . This book was released on 1984 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Forest Soils Research Theory Reality and Its Role in Technology Transfer

Download or read book Forest Soils Research Theory Reality and Its Role in Technology Transfer written by Margaret Gale and published by Gulf Professional Publishing. This book was released on 2005-12-21 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection represents a unique set of essays on the role of theory in shaping the practice of medicine across disciplinary boundaries. In the context of this volume, "theory” relates to the conceptual models, frameworks, knowledge representations, metaphors and analogies that inform the problem-solving efforts of practitioners seeking to develop novel dialogues both within and across disciplinary boundaries. Contributors to this volume include computational scientists, chemists, medical researchers, biologists and philosophers, all drawing on personal experience in their respective fields to produce a genuinely interdisciplinary range of perspectives on the common theme of theory in medical thinking and multidisciplinary research practice. * Selected and edited papers from the 10th North American Forest Soils Conference held in Saulte Ste. Marie, Ontario, Canada, July 20-24, 2003 * A unique spin-off from Elsevier's highly regarded journal, Forest Ecology and Management * An estimated 400 pages of the latest findings in forest soil ecology from the most prominent researchers in the field

Book General Technical Report PNW GTR

Download or read book General Technical Report PNW GTR written by and published by . This book was released on 2005 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Silviculture in Special Places

Download or read book Silviculture in Special Places written by and published by . This book was released on 2004 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Productivity of Western Forests

Download or read book Productivity of Western Forests written by and published by . This book was released on 2005 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: In August 20-23, 2004, a conference was held in Kamilche, WA, with the title S2Productivity of Western Forests: A Forest Products Focus. S3 The meeting brought together researchers and practitioners interested in discussing the economic and biological factors influencing wood production and value. One of the underlying assumptions of the meeting organizers was that management activities would be practiced within a framework of sustaining or improving site productivity; thus, several papers deal with methods to protect or improve productivity or discuss new studies designed to test the effects of various practices. This proceedings includes 11 papers based on oral presentations at the conference, 3 papers based on posters and 2 papers describing the Fall River and Matlock Long-Term Site Productivity study areas visited on the field tours. The papers cover subjects on forest harvesting activities, stand establishment, silviculture, site productivity, remote sensing, and wood product technologies.

Book Bibliography of Agriculture

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1992 with total page 1742 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Silviculture in Special Places

Download or read book Silviculture in Special Places written by Wayne D. Shepperd and published by . This book was released on 2004 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Proceedings RMRS

Download or read book Proceedings RMRS written by and published by . This book was released on 1998 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Year in Review for the Pacific Northwest Research Station

Download or read book A Year in Review for the Pacific Northwest Research Station written by Pacific Northwest Research Station (Portland, Or.) and published by . This book was released on 1998 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: