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Displaying 21 - 25 of 43Temporal change in forest fragmentation at multiple scales
Previous studies of temporal changes in fragmentation have focused almost exclusively on patch and edge statistics, which might not detect changes in the spatial scale at which forest occurs in or dominates the landscape. We used temporal land-cover data for the Chesapeake Bay region and the state of New Jersey to compare patch-based and area-density scaling measures of fragmentation for detecting changes in the spatial scale of forest that may result from forest loss. For the patch-based analysis, we examined changes in the cumulative distribution of patch sizes.
Assessing extinction risk in the absence of species-level data: quantitative criteria for terrestrial ecosystems
The conservation of individual plant and animal species has been advanced greatly by the World Conservation Union's (IUCN) development of objective, repeatable, and transparent criteria for assessing extinction risk, which explicitly separate the process of risk assessment from priority-setting. Here we present an analogous procedure for assessing the extinction risk of terrestrial ecosystems, which may complement traditional species-specific risk assessments, or may provide an alternative when only landscape-level data are available.
Collaborative R&D: intellectual property rights between Tsinghua University and multinational companies
Tsinghua University, one of the top universities in China, has conducted a lot of collaborative R&D projects with multinational companies in the recent years. One of tough issues in the collaborative R&D is to deal with the intellectual property rights. The Chinese Patent Law and other relevant laws make Tsinghua University to look for more intellectual property rights.
Homogenization of northern U.S. Great Lakes forests due to land use
Human land use of forested regions has intensified worldwide in recent decades, threatening long-term sustainability. Primary effects include conversion of land cover or reversion to an earlier stage of successional development. Both types of change can have cascading effects through ecosystems; however, the long-term effects where forests are allowed to regrow are poorly understood. We quantify the regional-scale consequences of a century of Euro-American land use in the northern U.S.
Effects of stream map resolution on measures of riparian buffer distribution and nutrient retention potential
Riparian ecosystems are interfaces between aquatic and terrestrial environments recognized for their nutrient interception potential in agricultural landscapes. Stream network maps from a broad range of map resolutions have been employed in watershed studies of riparian areas. However, map resolution may affect important attributes of riparian buffers, such as the connectivity between source lands and small stream channels missing in coarse resolution maps.