干旱区生态环境知识资源中心(Arid): 三江源南部草地退化时空特征分析

Arid

	三江源南部草地退化时空特征分析
其他题名	Spatial-Temporal Patterns of Grassland Gradation in Southern part of the Headwaters of the Three Rivers, Qinghai in China
	张小咏; 邵景安; 黄麟
ISSN	1560-8999
出版年	2008
卷号	10 期号:5 页码:645-650
中文摘要	本文利用三江源南部1977年MSS、1990年TM和2004年TM三期遥感影像，结合1：10万地形图、1：100万草地图、1：100万植被图和野外考察等资料，分析该区草地退化的时空变化特征和规律。结果表明：该区草地总体呈轻度退化，即为轻度破碎化退化、轻度覆盖度下降、轻度破碎化和轻度覆盖度下降复合型退化，共占研究区退化总面积的84．3％；轻度退化草地主要散布在唐古拉山东北部区域，中度退化草地多数分布于河流、居民点周围，草地轻度沙化／盐化退化主要发生在湖盆周围、河岸附近、滩地等区域。草地退化面积随海拔高度升高近似于正态分布，退化面积集中4400～5300m左右。1977～1990年和1990～2004年前后两期草地退化面积占研究区草地面积12．6％和18．9％，指示着草地状况的恶化。同时，对前后两个时段比较发现，草地退化发生以破碎化为先导，随后发生覆盖度持续降低。沼泽和沼泽化草甸的变化反映了区内气候的趋干化。另外，受气候条件等因素的影响，前期草地和沼泽变化有转好迹象。
英文摘要	Grassland is a main land type in the study area, the status and trends of its degradation become a major issue of the ecological construction in China, and have been raised to the level of the needs for national ecological economic strategy. Many studies showed that grassland ecosy climate-land cover-human activities, an indication of out of b stem degradation is, alance. Grassland d in the succession process of the egradation will lead to a series of environmental problems such as lower grassland production, land desertification, loss of biodiversity, soil degradation, loss of carbon sinks. Study areas located in the south of the head of Yangtze river. The total area is about 34069.31km~2, mainly covered by grassland（71.49% ） and swamp（ 10. 11% ）. The low and moderate covered grassland is 71.16% of the total grassland area. The increasing destruction of the land in this area have been kept increasing the risk of environmental degradation. Based on the TM/ETM in 1977, 1990 and 2004, geographical map （1：1190 000）, grassland map （1：1000 000）, and field data, the authors extract grassland degradation distri- bution characteristics. The Arcgis 9. 1 software was used to convert data types and do the overlay, reclassification, and zonal statistic analysis. Results show that grassland degradation is the most important land cover change in the study area, which occupied 11.84% of the whole region in the former phase and 21.54% in the later phase. The areas of degraded grassland are more in the later phase than in the former phase. Grassland in the former phase became better in some regions because of the climate and glacier ablation. The degraded grassland mainly occurs in the low altitude with relatively higher population density.
中文关键词	三江源南部 ; 草地退化 ; 时空特征
英文关键词	southern part of the Three-River Sources degraded grassland spatial temporal patterns
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:3402665
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222150
作者单位	中国科学院地理科学与资源研究所, 北京 100101, 中国
推荐引用方式 GB/T 7714	张小咏,邵景安,黄麟. 三江源南部草地退化时空特征分析[J]. 中国科学院地理科学与资源研究所,2008,10(5):645-650.
APA	张小咏,邵景安,&黄麟.(2008).三江源南部草地退化时空特征分析.,10(5),645-650.
MLA	张小咏,et al."三江源南部草地退化时空特征分析".10.5(2008):645-650.