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Grassland degradation in the ＂three-river headwaters＂ region, Qinghai Province

Journal of Geographical Sciences 2008年第3期18卷 259-273页

作者： LIU Jiyuan XU Xinliang SHAO Quanqin Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China

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 spatial and temporal characteristics of grassland degradation in the TRH region were analyzed since the *** results showed that grassland degradation in the TRH region was a continuous change process which had large affected area and long time scale,and rapidly strengthen phenomenon did not exist in the 1990s as a *** degradation pattern in the TRH region took shape initially in the mid and late *** the 1970s,this degradation process has taken place continuously,obviously characterizing different rules in different *** humid and semi-humid meadow region,grassland firstly fragmentized, then vegetation coverage decreased continuously,and finally＂black-soil-patch＂degraded grassland was *** in semi-arid and arid steppe region,the vegetation coverage decreased continuously,and finally desertification was *** grassland degradation had obviously regional differences in the TRH region,it could be regionalized into 7 zones, and each zone had different characteristics in type,grade,scale and time process of grassland degradation.

关键词： "three-river headwaters" region Qinghai grassland degradation remote sensing spatial pattern temporal process

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