【摘 要】
：
Supported by MSS images in the mid and late 1970s,TM images in the early 1990s and TM/ETM images in 2004,grassland degradation in the"Three-River Headwaters"region (TRH region)was interpreted through
【出 处】
：
Journal of Geographical Sciences
论文部分内容阅读
Supported by MSS images in the mid and late 1970s,TM images in the early 1990s and TM/ETM images in 2004,grassland degradation in the"Three-River Headwaters"region (TRH region)was interpreted through analysis on RS images in two time series,then the sp
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