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55 results found
Productivity of forest and range land soils is based on a combination of diverse physical, chemical and biological properties. In ecosystems characteristic of eastside regions of Oregon and Washington, the productive zone is usually in the upper 1 or 2 m. Not only are the biological processes that…
Author(s): Alan E. Harvey, J. Michael Geist, Gerald L McDonald, Martin F. Jurgensen, Patrick H. Cochran, Darlene Zabowski, Robert T. Meurisse
Keywords: Soil management strategy, soil productivity, soil sustainability, soil damage, soil moisture, soil microbiology, soil-disease interaction, soil-climate interaction, soil wood, coarse woody debris, organic matter, water storage and use, nutrient cycling, nitrogen ?xation, ectomycorrhizal activity, carbon cycling, harvest effects, ?re effects, fertilizer effects, forest health, physical properties, chemical properties
Source: Gen. Tech. Rep. PNW-GTR-323. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station.
Year: 1994
The effects on eastside forest ecosystems from long-term grazing by large mammals are assessed, because long-term herbivory can reduce or increase ecosystem productivity. The assessment emphasizes elk and cattle in the Blue Mountains of northeast Oregon and southeast Washington. Histories of…
Author(s): Larry L. Irwin, John G. Cook, Robert A. Riggs, Jon M. Skovlin
Keywords: Adaptive management, big game, Blue Mountains, cattle, density-dependence, ecosystem, elk, grazing, herbivory, livestock, nutrient cycling, ungulate
Source: Gen. Tech. Rep. PNW-GTR-325. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 49 p. (Everett, Richard L., assessment team leader; Eastside forest ecosystem health assessment; Hessburg, Paul F., science team leader and tech. ed., Volume III: assessment.)
Year: 1994
The magnitude and importance of wet deposition of N in forests of the South Coast (Los Angeles) Air Basin have not been well characterized. We exposed 3-yr-old ponderosa pine (Pinus ponderos Laws.) seedlings growing in native forest soil to acidic fog treatments (pH 3.1) simulating fog chemistry…
Author(s): Mark E. Fenn, Theodor D. Leininger
Keywords: Nitrogen deposition, nitrogen saturation, nutrient cycling, wet deposit, ammonium nitrate
Source: Forest Science, Vol. 41, No. 4, November 1995. pp 645-663.
Year: 1995
For the first 4 years, height increment of an eastern cottonwood plantation on a clayey soil was greatest in the first growing season; diameter growth was greatest in the second growing season; and annual production of biomass was greatest in the third year. Nitrogen, phosphorus, and possibly…
Author(s): John K. Francis, James B. Baker
Keywords: Populus deltoides Bartr, nutrient cycling, nutrient translocation
Source: Res. Note SO-278. New Orleans, LA: U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station. 4 p.
Year: 1981
Soil organisms have become a focus of attention for addressing issues of soil quality and health, and ecosystem sustainability. Land managers are challenged to ensure that their actions are beneficial to belowground organisms and processes in the long term. Research about soil organisms, their…
Author(s): Robert T. Meurisse, William G. Ypsilantis, Cathy Seybold
Keywords: Soil organisms, soil quality, nutrient cycling, nitrogen transformations, foodwebs, ecosystem integrity, soil resilience, ecosystem resilience, bacteria, fungi, arthropods, root diseases, soil crusts, disturbance, interactions
Source: Gen. Tech. Rep. PNW-GTR-461. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 215 p
Year: 1999
In 1951, stream gaging was begun on five small headwater catchments on the Fernow Experimental Forest in West Virginia, to study the effects of forest management activities, particularly timber harvesting, on water yield and quality. Results from these watersheds, and others gaged more recently,…
Author(s): M.B. Adams, P.J. Edwards, J.N. Kochenderfer, F. Wood
Keywords: Fernow Experimental Forest, timber harvesting, water yield, nutrient cycling, sediment, watershed studies
Source: In: Renard, Kenneth G.; McElroy, Stephen A.; Gburek, William J.; Canfield, H. Evan; Scott, Russell L., eds. First interagency conference on research in the watersheds; 2003 October 27-30; Benson, AZ. Tucson, AZ: U.S. Department of Agriculture, Agricultural Research Service, Southwest Watershed Research Center: 391-396.
Year: 2004
Nitrogen and phosphorus flow in litterfall and throughfall were studied in two California Quercus species (the evergreen Q.agrifolia and deciduous Q. lobata) before, during, and after an outbreak of the California oak moth, Phryganidia californica. All of the foliage of both oak species was removed…
Author(s): David Y. Hollinger
Keywords: herbivory, nutrient cycling, Quercus, evergreen, deciduous
Source: Oecologia. 70: 291-297.
Year: 1986
A large part of the nutrient flux in deciduous forests is through fine root turnover, yet this process is seldom measured. As part of a nutrient cycling study, fine root dynamics were studied for two years at Huntington Forest in the Adirondack Mountain region of New York, USA. Root growth…
Author(s): Dudley J. Raynal
Keywords: fine roots, northern hardwood forest, nutrient cycling, phenology, production, turnover
Source: Plant and Soil 162:135-146
Year: 1994
Review of current literature establishes that forest fertilization is a proven, accepted management practice in limited areas of the South where lack of one or more mineral nutrients seriously curtails pine growth and where moderate additions of these nutrients markedly increase yields. In most of…
Author(s): Eugene Shoulders, W.H. McKee
Keywords: fertilization, nutrient cycling, soil fertility
Source: Gen. Tech. Rep. SO-2. New Orleans, LA: U.S. Dept of Agriculture, Forest Service, Southern Forest Experiment Station. 26 p.
Year: 1973
Compares rates of forest floor decomposition and nutrient turnover in aspen and conifers. These rates were generally most rapid under aspen, slowest under spruce, and more rapid on a loamy fine sand than on a very fine sandy loam. Compares results with literature values.
Author(s): D. A. Perala, D.H. Alban
Keywords: mineralization, nutrient cycling, litterfall, nitrogen, phosphorus, potassium, calcium, magnesium
Source: Research Paper NC-227. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station
Year: 1982