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中文摘要：
基于RS与GIS技术，利用1986、1995、2000年3期遥感影像，解译提取松嫩平原西部草地空间信息，分析其时空动态变化及草地退化的自然及人文因素。结果表明，14a来，草地面积减少24．70％，草地退化严重；高覆盖度草地减少迅速，对该区草地资源减少率的贡献较大，低覆盖度草地发展速度最快；草地主要转化为林地、耕地、未利用地和盐碱地；研究区草地退化是自然因素与人为因素共同作用的结果，气温升高、降水减少等自然因素是草地退化形成的基本条件，而人口增加、过度放牧等人类活动干扰则是决定因素。图4，表2，参17。
英文摘要：
Based on KS and GIS technique, three-period （1986,1995,2000） remote sensing images are interpreted to extract spatial information of grassland landscape in the westem of Songnen plain, then spatial-temporal dynamics of grassland and the natural and human factor of grassland degradation are analyzed .The results show that grassland area decreased 24.7%, grassland degradation is serious. Grassland is mainly converted into forestland, cropland, tmused land and saline-alkatized land. During 1986- 1995, low coverage grassland rapidly developed, and high coverage grassland declined greatly during 1995 - 2000.From 1986 to 2000,both natural factors and human activities result in grassland degradation in studying region, natural factors are basic condition of grassland degradation, and human activities are crucial factors.
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