نتایج جستجو برای: forest service
تعداد نتایج: 431278 فیلتر نتایج به سال:
Snags (standing dead trees) provide important habitat for forest wildlife, as well as a source of coarse woody debris important in forest succession. Because of their importance, some land-management agencies have standards for snag retention on lands under their jurisdiction (e.g. U.S. Forest Service, British Columbia Ministry of Forestry). Despite these guidelines, however, little information...
The Water Erosion Prediction Project (WEPP) is a physically based erosion model for applications to dryland and irrigated agriculture, rangeland, and forests. U.S. Forest Service (USFS) experience showed that WEPP was not being adapted because of the difficulty in building files describing the input conditions in the existing interfaces. To address this difficulty, a suite of Internet interface...
BACKGROUND Forests can sequester carbon dioxide, thereby reducing atmospheric concentrations and slowing global warming. In the U.S., forest carbon stocks have increased as a result of regrowth following land abandonment and in-growth due to fire suppression, and they currently sequester approximately 10% of annual US emissions. This ecosystem service is recognized in greenhouse gas protocols a...
Landis, T.D.; South, D.B., tech. coords. 1997. National proceedings: Forest and Conservation Nursery Associations—1996. Gen. Tech. Rep. PNW-GTR-389. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 282 p. This proceedings is a compilation of 51 papers that were presented at the regional meetings of the forest and conservation nursery associations...
Down deadwood (DDW) is a carbon component important in the function and structure of forest ecosystems, but estimating DDW is problematic because these data are not widely available in forest inventory databases. However, DDW data were collected on USDA Forest Service Forest Inventory and Analysis (FIA) plots during Maine's 1995 inventory. This study examines ways to predict DDW biomass from ot...
Historical forest landscape dynamics include consideration of spatial and temporal distributions of forest conditions over recent history and also historical disturbance regimes. Understanding of historical landscape dynamics in these senses is relevant to planning future management of federal forest lands on both policy and ecological grounds. Although some particular elements of our policy fr...
-Forest health, vitality, and productivity are interrelated and are maintained by using sound forest management. There are some standard indicators that are measured to assess the extent and severity of damage inflicted by biotic and abiotic agents. Assessment of these indicators using affordable methods is a subjective process. A video rangefinder instrument is presented here as an advance tow...
Litigation over national forest management has received substantial attention from members of Congress who claim that “environmental obstructionists” are abusing the legal system; conversely, litigants criticize the U .S . Forest Service’s practice of collaborative management as insufficiently protective, leaving courts as the best resort . The authors review the emergence and increasing use of...
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