نتایج جستجو برای: forest range
تعداد نتایج: 766089 فیلتر نتایج به سال:
The current epidemic of the mountain pine beetle (MPB), an indigenous pest of western North American pine, has resulted in significant losses of lodgepole pine. The leading edge has reached Alberta where forest composition shifts from lodgepole to jack pine through a hybrid zone. The susceptibility of jack pine to MPB is a major concern, but there has been no evidence of host-range expansion, i...
Miller, J.H. and Newton, M., 1983. Nutrient loss from disturbed forest watersheds in Oregon’s Coast Range. Agro-Ecosystems, 8: 153-167. Dissolved nutrients were monitored bi-weekly in stream water draining 14 upland watetzhcds in Oregon’s Coast Range after sprayin g with 2,4:5-T + 2,4-D, clrarcut harvesting and slash burning. Anion generation and leaching were primarily studied. The nitrate con...
Logan A. Norris', Marvin L. Montgomery 2 , Warren L. Webb3, Henry J. Schroeder, Jr. 3, and Fred Grosso 'Pacific Northwest Forest and Range Experiment Station Forest Service, U.S. Department of Agriculture Corvallis, Ore. 97331 'Department of Agricultural Chemistry 'Department of Forest Management Oregon State University Corvallis, Ore. 97331 °Bonneville Power Administration U.S. Department of t...
Carbon stocks in managed forests of Ontario, Canada, and in harvested wood products originated from these forests were estimated for 2010-2100. Simulations included four future forest harvesting scenarios based on historical harvesting levels (low, average, high, and maximum available) and a no-harvest scenario. In four harvesting scenarios, forest carbon stocks in Ontario's managed forest were...
Over the past two decades there has been an abundance of research demonstrating the utility of airborne light detection and ranging (LiDAR) for predicting forest biophysical/inventory variables at the plot and stand levels. However, to date there has been little effort to develop a set of protocols for data acquisition and processing that would move governments or the forest industry towards co...
“Measuring” the soundscape is like trying to measure the ocean, the forest, or the city—one dimensional metrics and color-coded maps are inadequate to meaningfully describe the myriad complex conditions, relationships, and effects which comprise the soundscape’s impact upon us, and our impact upon it. In order to better understand the subjective experience of the soundscape, we need new methods...
The thamin (Cervus eldi) is an endangered species of deer whose present range is greatly reduced from its original distribution covering the deciduous forests throughout south-east Asia. We mapped the present distribution of thamin using ground surveys and tied this information to habitat types derived from satellite images in order to detect patterns that might indicate the landscape features ...
Long-range regional projections of the changes in forest type areas are important in public and private forest resources planning. The combination of natural forces and human activities, which are shaped by socioeconomic forces such as population and income trends, has led to striking changes in forest cover types for the three major types of private owners. A model for the U.S. Southeast is pr...
Reducing carbon emissions from deforestation and degradation in developing countries is of central importance in efforts to combat climate change. Key scientific challenges must be addressed to prevent any policy roadblocks. Foremost among the challenges is quantifying nations’ carbon emissions from deforestation and forest degradation, which requires information on forest clearing and carbon s...
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