近30年来青海三江源地区草地退化的时空特征(英文)

编号 zgly0001586849

文献类型 期刊论文

文献题名 近30年来青海三江源地区草地退化的时空特征(英文)

作者 刘纪远  徐新良  邵全琴 

作者单位 InstituteofGeographicSciencesandNaturalResourcesResearchCAS  InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  Beijing100101  China 

母体文献 Journal of Geographical Sciences 

年卷期 2008年03期

年份 2008 

分类号 S812 

关键词 Three-RiverHeadwatersregion  Qinghai  grasslanddegradation  remotesensing  spatialpattern  temporalprocess 

文摘内容 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 theThree-River Headwatersregion (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 finallyblack-soil-patchdegraded 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.