| Grassland degradation in the ＂Three-River Headwaters＂ region,Qinghai Province |
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| 引用本文： | 刘纪远,徐新良,邵全琴.Grassland degradation in the ＂Three-River Headwaters＂ region,Qinghai Province[J].地理学报(英文版),2008,18(3):259-273. |
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| 作者姓名： | 刘纪远 徐新良 邵全琴 |
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| 作者单位： | Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China |
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| 基金项目： | CAS Action-plan for West Development, No.KZCX2-XB2-06-03; National Key Project of Scientific and Technical Supporting Programs, No.2006BAC08B00.Acknowledgements The authors thank Prof. Fan Jiangwen, assistant Prof. Zhong Huaping and Wang Junbang, Ph.D. Shao Jing＇an and Zhang Xiaoyong, Ph.D. candidates Lu Heli, Lu Qingshui, Chen Zhuoqi, Huang Lin and Lu Ning, Master students Zhang Shuai, Zhao Zhiping and Zhang Wenyan, project staff Bai Lu from project team of Integrated Ecosystem Assessment of the Three-River Headwaters Region, of Institute of Geographic Sciences and Natural Resources Research （CAS） for their grassland degradation interpretation and data analysis. Qinghai Environmental Monitoring Central Station provides great support for the implementation of this project. Besides, Prof. Qi Jiaguo from Michigan State University （USA） contacted U.S. Geological Survey EROS Data Center and provides MSS images for the project team. |
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| 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 1970s.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 whole.Grassland degradation pattern in the TRH region took shape initially in the mid and late 1970s.Since the 1970s,this degradation process has taken place continuously,obviously characterizing different rules in different regions.In humid and semi-humid meadow region,grassland firstly fragmentized, then vegetation coverage decreased continuously,and finally＂black-soil-patch＂degraded grassland was formed.But in semi-arid and arid steppe region,the vegetation coverage decreased continuously,and finally desertification was formed.Because 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.
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| 关 键 词： | 青海 三江源地区 草地退化 时空特征 |
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