锡林河流域近15年植被空间结构变化遥感分析

利用1985年与1999年TM遥感影像，通过地面详查，对锡林河流域植被类型及空间结构在近15年的变化进行了对比监测与分析。结果表明：由于过度放牧与草原垦殖，锡林河流域各植物群落类型面积在近15年发生了变化。1999年与1985年相比，羊草、大针茅、旱中生杂类草草原与大针茅、羊草、中旱生杂类草草原，分别减少了20．17％与28．4％，冷蒿草原面积增加了46．6％，草原植被开垦的面积增加了34．8％，总体上，锡林河流域草原植被呈明显退化受损态势。

Change in the Spatial Structure of Grassland Vegetation in the Xilin River Basinrom 1985 to 1999

Using Landsat TM images of 1985 and 1999, and through field investigation, the monitoring and analysis on the change of grassland vegetation types and distribution in the Xilin River Basin from 1985 to 1999 were made.Due to overgrazing and cultivating,the area of grassland plant community has changed. Comparing with 1985, the area of Leymus chinensis,Stipa grandis meso xero forbs steppe and Stipa grandis, Leymus chinensis xero forbs steppe decreased by 20.2% and 28.4%, and the area of Artemisia frigida steppe increased by 46.6%. In the past two decades, the area of grassland cultivated increased by 34.8%. In whole, the grassland vegetation in the Xinlin River Basin is in a state and trend of degradation.