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Showing items 41851 through 41859 of 73379.The suitable spectral mode in remote sensing is often desirable to facilitate the inversion of ecological environment and landscape. This paper put forward an optimizing model based on variable precision rough sets (VPRS) for the land cover discrimination in wetland inventory.
The terrestrial export of dissolved organic nitrogen (DON) is associated with climate, geography and land use, and thus is influenced by geo-climatic variability, human interference, the farmland and woodland in soil, and hydrological connection levels to rivers.
This paper looks more closely at the sources of patent growth in the United States since 1984. It confirms that the increase is largely due to U.S. patenters, with an earlier surge in Asia, and some increase in Europe.
Remote sensing images can be used to delineate variations in the area of lakes and to assess the influence of environmental changes and human activities.
Rangeland degradation by livestock threatens several restricted-range species, but is largely overlooked by conservation biologists.
Farm production is surrounded by uncertainty. Between planting and harvesting manyrandom events such as plagues, droughts and sudden changes in commodity prices, may affectfarmers’ revenues.
Although common disturbances of grazing lands like plant defoliation are expected to affect their sensitivity to increasing atmospheric CO2 concentration, almost no research has been conducted to evaluate how important such effects might be on the direct responses of rangelands to CO2.
It is necessary to estimate the area of afforestation and deforestation in New Zealand, since 1990, to meet reporting obligations under the Kyoto Protocol. We describe a method for national mapping of forest change that achieves high accuracy, but only requires moderate effort.
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