内蒙古西部生态环境综合评价研究

内蒙古西部生态环境比较恶劣，影响生态环境的因子很多，从土地利用方式、环境现状和人类活动排泄物等3个方面出发，选取了对环境影响最重要的17个主导因子，采用综合指数法和灰色关联系数法，以旗县为评价单元进行生态环境综合评价。评价结果显示，内蒙古西部生态环境质量指数在—28．35～2．67之间。根据评价结果将内蒙古西部各旗县的生态环境质量分为4级，其中一级占15.4％，二级占36．5％，三级占34．6％，四级占13.5％。结果表明以牧业为主的旗县生态环境相对良好，旱作农业和灌涸农业次之，城市市区的环境质量最差。

Integrated Ecological Environment Evaluation in West Region of Inner Mongonlia

Ecological environment degradation, which is affected by natural condition and human activity, is very universal in the west region of Inner Mongolia. According to the degree of land use change, environmental degradation and human activity excretion in county (banner or city) unit, we chose seventeen major factors that obviously influenced the environment as the evaluating indices to assess ecological environment by using methods of comprehensive index and gray correlation index. Results showed that the indices of ecological environment quality varied from \{-28.35\} to 2.67 in this region. The quality of ecological environment based on evaluation results in county (banner or city) unit was divided into four levels. First level, county (banner or city) occupied 15.4% among of total counties, second 36.5%, third 34.6% and fourth 13.5%. The results also showed that there should be good status of ecological environment if major activity is grazing in some county (Banner). On the contrary, urban area was surrounded by degraded environment. The quality of ecological environment is moderate in rain and irrigation agriculture areas.