中文摘要：

以地处浑善达克沙地腹地的正蓝旗为研究区，以TM／ETM＋影像数据为基础，利用动态度、栅格运算等方法，对该区1980年代以来四个时期的草原沙化状况及其空间动态变化进行了监测分析，并探讨了正蓝旗草原沙化变化与降雨、温度、人口和牲畜等数据的关系。结果表明：（1）三级沙化草地及未沙化草地间的相互转换主导着草原沙化发展或是逆转的方向；（2）中度沙化草地的变化方向对草原沙化发展的方向及沙化结构影响作用突出；（3）沙化发展区主要分布在赛音呼都嘎苏木东南部以及桑根达来镇东部；（4）自然因素作为草原沙化的环境背景并无明显变化，畜牧、沙化治理政策等人为因素是草原沙化逆转或发展的主导因子。

英文摘要：

Based on the dynamic degree analysis and grid calculation analysis of the TM/ ETM data in four periods, the status and spatial dynamic variation of grassland sandy de- sertification in Zhenglan Banner were monitored and studied. The relationships between grassland sandy desertification and relevant factors, i.e. climate, population, and live- stock, were discussed. The results sl~ow that： 1） The change direction of grassland deser- tification was due to the interconversion of non-sandy and three-level desertification grass- land. 2） The change of medium grassland desertification affects the structure and change direction of the grassland desertification prominently. 3） The developing-sandy grassland area is mainly distributed in the southeast of Sain Hudag and the eastern part of Sanggin Dalai. 4） Human factors, such as animal husbandry and desertification control policies were the dominant factors during the reversion and deterioration process of grassland de- sertification, whife natural factors had no significant change as the environmental background.