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171 results found
Within-stand variation in understory species composition and biomass was studied in 16 even-aged stands of mixed red alder-Sitka spruce-western hemlcock (Alnus rubra-Picea sitchensis-Tsuga heterophylla) forest. The sites were upland sites, and the stands were 28-39 years…
Author(s): T.A. Hanley, J.C. Barnard
Keywords: Red alder, Alnus rubra, Sitka spruce, Picea sitchensis, western hemlock, Tsuga heterophylla, secondary succession, understory, biomass, forests
Source: Canadian Field-Naturalist. 112(4): 647-652
Year: 1998
Efficiency of harvest, overstory regrowth, and regeneration establishment are compared among 12 even- and uneven-aged regeneration cuttings installed in 1984 in subalpine Engelmann spruce and lodgepole pine forests on the Fraser Experimental Forest in central Colorado. Individual tree selection and…
Author(s): Wayne D. Shepperd, Lance A. Asherin, Stephen A. Mata, Douglas L. McClain
Keywords: efficiency of harvest, overstory regrowth, regeneration establishment, Engelmann spruce, lodgepole pine, forests, treatments, Fraser Experimental Forest
Source: In: Shepperd, Wayne D.; Eskew, Lane G., compilers. 2004. Silviculture in special places: Proceedings of the National Silviculture Workshop; 2003 September 8-11; Granby, CO. Proceedings RMRS-P-34. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 102-109
Year: 2004
Not all forests with old trees are scientifically defined as old growth. Among those that are, the variations are so striking that multiple definitions of old-growth forests are needed, even when the discussion is restricted to Pacific coast old-growth forests from southwestern Oregon to…
Author(s): Valerie Rapp
Keywords: Old-growth, forests, new findings
Source: Science Update 4. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p
Year: 2003
Calcium occupies a unique position among plant nutrients both chemically and functionally. Its chemical properties allow it to exist in a wide range of binding states and to serve in both structural and messenger roles. Despite its importance in many plant processes, Ca mobility is low, making Ca…
Author(s): S.B. McLaughlin, R. Wimmer
Keywords: calcium, forests, ecosystem, physiology, structure, function
Source: New Phytol. (1999) 142, 373-417
Year: 1999
A common popular assertion is that trade liberalization encourages deforestation. But whether this is true depends on how trade policies affect the allocation of land among competing uses and how they influence illegal cutting of public forests. A model is presented that allows for forests to be…
Author(s): Jeffrey P. Prestemon
Keywords: deforestation, forests, land quality, land-use choice, NAFTA, ownership heterogeneity
Source: Environmental and Resource Economics <b>17:</b> 311-334, 2000
Year: 2000
Many of the potential effects of ultraviolet radiation (UVR--damage to materials, altered herbivory of insects and activity of microbes, modified growth of vegetation, and adverse or beneficial effects on human health?are modified by the presence of trees that influence UVR exposure to various…
Author(s): Gordon M. Heisler, Richard H. Gao, Wei Grant
Keywords: forests, human health, ozone, plant competition, solar radiation, tree shade
Source: Agriculturaland Forest Meteorology. 120: 113-126.
Year: 2003
Summary - Vegetation helps stabilize forested slopes by providing root strength and by modifying the saturated soil water regime. Plant roots can anchor through the soil mass into fractures in bedrock, can cross zones of weakness to more stable soil, and can provide interlocking long fibrous…
Author(s): Robert R. Ziemer
Keywords: PSW4351, landslides, soil water, root strength, forests, slope stabilit
Source: Proceedings of the International Union of Forestry Research Organizations, XVII World Congress, 6-17 September 198l, Kyoto, Japan. vol. I: 297-308.
Year: 1981
Land management professionals (foresters, wildlife biologists, range managers, and land managers such as ranchers and forest land owners) often have need to evaluate their management activities. Photographic monitoring is a fast, simple, and effective way to determine if changes made to an area…
Author(s): Frederick C. Hall
Keywords: Monitoring, photographs, landscapes, transects, animal sampling, riparian, succession, forests, rangeland
Source: Gen. Tech. Rep. PNW-GTR-503. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 340 p
Year: 2001
Abstract: Methods are described for evaluating economic and carbon storage aspects of tree planting projects (e.g., plantations for restoration, roundwood, bioenergy, and nonwood products). Total carbon (C) stock is dynamic and comprises C in vegetation, decomposing matter, soil, products, and…
Author(s): Peter J. Parks, David O. Hall, Bengt Kristrom, Omar R. Masera, Robert J. Multon, Andrew J. Plantinga, Joel N. Swisher, Jack K. Winjum
Keywords: Global change, forests, carbon, plantations, tree planting, project evaluation
Source: Critical Reviews in Environmental Science and Technology, 27(Special): S9-S21
Year: 1997
Contains information about carbon storage in the vegetation, soils, and peatlands of Russia. Estimates of carbon storage in forests are derived from statistical data from the 1988 national forest inventory of Russia and from other sources. Methods are presented for converting data on timber stock…
Author(s): V.A. Alexeyev, R.A. Birdsey, [Editors]
Keywords: carbon storage, forests, peatlands, forest inventory, Russia, phytomass, ecoregions
Source: Gen. Tech. Rep. NE-244. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 137 p.
Year: 1998