Grassland degradation in the ＂Three-River Headwaters＂ region, Qinghai Province

作     者：LIU Jiyuan XU Xinliang SHAO Quanqin LIU Jiyuan;XU Xinliang;SHAO Quanqin

作者机构：Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China 

出 版 物：《Journal of Geographical Sciences》 (地理学报（英文版）)

年 卷 期：2008年第18卷第3期

页      面：259-273页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：CAS Action-plan for West Development,No.KZCX2-XB2-06-03 National Key Project of Scientific andTechnical Supporting Programs,No.2006BAC08B00 

主　　题："Three-River Headwaters" region Qinghai grassland degradation remote sensing spatial pattern temporal process 

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 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.