Grassland degradation in the

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	Grassland degradation in the
	Shao Quanqin; Xu Xinliang; Liu Jiyuan(刘纪远)
刊名	JOURNAL OF GEOGRAPHICAL SCIENCES
	2008
卷号	18 期号:3 页码:259-273
关键词	Three-River Headwaters region Qinghai grassland degradation remote sensing spatial pattern temporal process
通讯作者	Liu JY
中文摘要	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 IRS 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 and 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.
学科主题	Geography ; Physical
收录类别	SCI
公开日期	2011-05-27
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/3167]
专题	地理科学与资源研究所_专家文献库
推荐引用方式 GB/T 7714	Shao Quanqin,Xu Xinliang,Liu Jiyuan. Grassland degradation in the[J]. JOURNAL OF GEOGRAPHICAL SCIENCES,2008,18(3):259-273.
APA	Shao Quanqin,Xu Xinliang,&Liu Jiyuan.(2008).Grassland degradation in the.JOURNAL OF GEOGRAPHICAL SCIENCES,18(3),259-273.
MLA	Shao Quanqin,et al."Grassland degradation in the".JOURNAL OF GEOGRAPHICAL SCIENCES 18.3(2008):259-273.