中文摘要：

土地利用规划环境影响评价对于避免规划造成的生态环境影响和维护区域生态安全有着重要性的战略意义。基于生态安全来进行土地利用规划环境影响评价，可以充分体现土地利用规划格局影响生态学过程的作用机制。本文以农牧交错带的典型区域一内蒙古自治区翁牛特旗为研究对象，通过构建土地利用规划环境影响评价的生态安全综合指数及其评价方法，并基于GIS对研究区进行了土地利用规划前后的环境影响评价，得出如下主要结果：①土地利用规划前（2000年期间），研究区有一半以上的总面积处于土地沙化和土壤侵蚀的危害，中西部地区的土壤侵蚀和东部地区的土地沙化依然严重，需要采取严格的水土保持和防止沙化措施；②土地利用规划方案实施调整后，研究区平均生态安全指数为4．13，处于生态较安全等级。研究区内没有生态不安全区和生态极不安全区分布；③评价结果能反映土地利用规划方案环境影响的空间特征，说明构建的生态安全综合指数与评价方法是可行的。

英文摘要：

With the rapid development of cities and towns and the acceleration of industrialization, eco-environment problems caused by regional land use changes appear increasingly marked. This has been resulting in land degradation, aggravation of soil and water loss, and land use contamination, which seriously affected harmonious development of society, economy and the ecological environment. Environmental Impact Assessment （EIA） of land use planning plays a vital role in revealing potential effects of the implementation of land use planning on the eco-environment, greatly benefiting regional ecological integrity. EIA, as a basis for land use planning, has been developed and implemented for thirty years abroad, but has not been commonly noted and used in China. In the present research, the authors performed a study on application of EIA to Ongniud Banner, Inner Mongolia, an agro-pastoral zone of North China. Ecological security synthetical indices and assessment methods were constructed on the basis of EIA for land use planning and GIS techniques. Major conclusions were given as follows. First, above half of the entire study area was basically at risk of desertification and soil erosion in the year 2000, with showing that soil erosion in the central and western regions and land desertification in the eastern area were serious. As such, strict measures regarding water and soil conservation and desertification prevention should be taken immediately to alleviate the degradation of the ecosystem. Second, after performing the land use planning, there would be no areas ranking from 4 to 5 grades corresponding to the statues of insecure and extreme insecure, respectively, in Ongniud Banner areas. Third, the average ESSI in this region was roughly 4.13, corresponding to a kind of relative secure statue. In general, the comprehensive indexes depicting the ecological integrity and the evaluation method developed in the study were basically feasible, resulting in reliable spatial characteristics of the environmental impact caus