Download or read book Nitrogen Mineralization Responses to Bearclover Incorporation in Forest Soils written by Beverly Anne Gularte and published by . This book was released on 1993 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agronomy News written by and published by . This book was released on 1993 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.
Download or read book Response of Needle litter Decomposition and Soil Nitrogen Mineralization to Logging debris Manipulation and Competing Vegetation Control in Western Oregon and Washington written by Nathan Andrew Meehan and published by . This book was released on 2006 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Growing societal demand for forest products is pressuring managers to increase productivity from a finite land area, and it is expected that increased supply will come mostly from expansion of intensively managed stands. The USDA Forest Service and numerous collaborators created the Long-Term Soil Productivity (LTSP) network of research sites across North America to investigate the implications of intensive management. The purpose of the LTSP research program is to examine effects of management disturbances on soil productivity, evaluate standards for soil quality monitoring, understand fundamental relationships between soil, forest management practices, and long-term productivity, and to examine ways to mitigate adverse disturbance effects. Research in this thesis was conducted at the Matlock, WA and Molalla, OR LTSP affiliate sites, which were specifically designed to examine effects of contemporary management practices on growth and productivity of Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) as well as the driving soil factors associated with productivity. Three levels of logging-debris manipulations (bole-only, whole-tree, bole-only with debris piling) and two herbicide treatments (initial and sustained control) were replicated using a randomized complete block design at each study site. A stratified sampling scheme was used to characterize needle-litter decomposition (using a litterbag study) and associated nutrient dynamics as well as net nitrogen (N) mineralization (using in situ sequential coring) in the mineral soil. Rates of needle-litter decomposition were highest in conditions characterized by thick debris coverage. Needles acted as an N sink, immobilizing 14 to 40 kg N ha-1 y-1 initially. Needles were a source of potassium (K) and calcium (Ca), and a minimal source of phosphorus (P) and magnesium. Soil net N mineralization results were highly variable, likely reflecting extensive soil variability, although some patterns were observed. Nitrate-N was the dominant inorganic N form in soils, and accumulations between 25-45 mg N kg-1 soil yr-1 were found at sites. A faster Douglas-fir needle-litter decomposition rate was observed in bole-only logging-debris treatments at Matlock (lower productivity site), which also retained higher N, P, K, and Ca percentages than other treatment types. No treatment differences in needle-litter decomposition and nutrient-release dynamics were observed at Molalla (higher productivity site), possibly resulting from greater resource availability. At both sites, a combination of soil net N mineralization in the range of 25-75 mg N kg-1 soil yr-1 and high rates of initial N immobilization in decomposing needle materials suggests that N is being retained in response to the three logging-debris and two vegetation control treatments. Early dynamics of these two soil processes suggest that soil N pools are initially conserved.
Download or read book Silvics of Forest Trees of the United States written by and published by . This book was released on 1965 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Woody Plant Seed Manual written by United States. Forest Service and published by Forest Service. This book was released on 2008 with total page 1240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Germfree Life And Gnotobiology written by Thomas Luckey and published by Elsevier. This book was released on 2012-12-02 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Germfree Life and Gnotobiology focuses on the theory and general aspects of germfree research and gnotobiology. Using a phylogenetic approach, the book provides a summary of germfree work in all phyla, from bacteria and viruses to protozoans and invertebrates. It characterizes germfree vertebrates based on data on morphology, biochemistry, nutrition, serology, and physiology. This book is organized into six chapters and begins with an overview of germfree life and gnotobiology, including biological isolation as the basis of germfree life, germfree conditions in nature, and the biological significance of germfree research. A section is devoted to nomenclature and terminology. The chapters on methods and nutrition are sufficiently detailed to serve as guides for experimental work. The book concludes with a chapter on exploratory research that explores the inoculation of germfree animals with known kinds of microorganisms. Terms have been introduced to describe concepts and provide precise communication. This book is a valuable source of information for scientists and researchers engaged in germfree research as a biological tool.
Download or read book National Report on Sustainable Forests written by and published by . This book was released on 2004 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This site also contains other information about sustainable resource management.
Download or read book Checklist of United States Trees native and Naturalized written by Elbert Luther Little and published by . This book was released on 1979 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Distribution of Forest Trees in California written by James R. Griffin and published by . This book was released on 1972 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution of 86 forest and woodland tree taxa native to California is illustrated on maps. Descriptive notes relate the distribution of each species to its ecological and taxonomic context, including the plant communities in which the tree commonly appears. Nearly one-fourth of the species illustrated are restricted to California, and the distribution of many others is centered in the State. Supplement contains corrigenda and addenda.
Download or read book Young Adult Conservation Corps written by Young Adult Conservation Corps (U.S.) and published by . This book was released on 1978 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eastern Forest Insects written by Whiteford Lee Baker and published by . This book was released on 1972 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Washington Soils written by Elton Fulmer and published by . This book was released on 1894 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alaska Trees and Shrubs written by Les Viereck and published by University of Alaska Press. This book was released on 2010-11-15 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alaska Trees and Shrubs has been the definitive work on the woody plants of Alaska for more than three decades. This new, completely revised second edition provides updated information on habitat, as well as detailed descriptions of every tree or shrub species in the state. New distribution maps reflect the latest survey data, while the keys, glossary, and appendix on non-native plants make this the most useful guide to Alaska trees and shrubs ever published.
Download or read book Watershed condition framework written by United States. Forest Service and published by . This book was released on 2011 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hemlock Dwarf Mistletoe written by Paul E. Hennon and published by . This book was released on 2001 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pathology in Forest Practice written by Dow Vawter Baxter and published by . This book was released on 1952 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Note PNW written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1980 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
