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Along with its economic reform, China has experienced a rapid urbanization. This study mapped urban land expansion in China using high-resolution Landsat Thematic Mapper and Enhanced Thematic Mapper data of 1989/1990, 1995/1996 and 1999/2000 and analyzed its expansion modes and the driving forces underlying this process during 1990-2000. Our results show(More)
Gross primary production (GPP) plays an important role in the net ecosystem exchange of CO 2 between the atmosphere and terrestrial ecosystems. It is particularly important to monitor GPP in Southeast Asia because of increasing rates of tropical forest OPEN ACCESS 2109 degradation and deforestation in the region in recent decades. The newly available,(More)
To assess the fate of the large amounts of nitrogen (N) brought into the agricultural environment by human activities in the Changjiang River basin, we used [China's county level agricultural database of 1980 and 1990. National Resources and Environmental Data Center, China] and published conversion data to set up a complete N budget for the Changjiang(More)
Western Development is an important strategy of China Government. The ecological environment in the western region of China is very fragile, and any improper human activity or resource utilization will lead to irrecoverable ecological degradation. Therefore, the integrated ecosystem assessment in the western region of China is of great significance to the(More)
Image segmentation, which usually employs a statistical model, is an essential step in synthetic aperture sonar (SAS) image processing. This work addresses the Rayleigh mixture model (RMM), representing SAS underwater amplitude image. High resolution SAS image of detected artificial object is segmented using RMM and Markov random field (MRF) model. We(More)
Emerging threats to the water resources and biodiversity at the roof of the world to Asia's lowland from land-use changes associated with large-scale settlement and piecemeal development The fall of the water Emerging threats to the water resources and biodiversity at the roof of the world to Asia's lowland from land-use changes associated with large-scale(More)