中文摘要：

以1km×1km栅格为基本单元,建立地形、气候、水文和地被等人居环境单要素评价模型和人居环境综合评价模型,系统评估了内蒙古人居自然环境的适宜性与限制性,定量揭示了内蒙古人居环境的地域类型与空间格局。研究表明：内蒙古地形条件较好、气候偏寒、水文和植被条件较差,自然条件是影响内蒙古人口分布的重要因素;内蒙古人居环境以限制性为主要特征,自治区人居环境由41.15%的不适宜区、37.07%的临界适宜区以及21.78%的适宜区组成,不适宜人类长年生活和居住的地区面积最大;内蒙古人居环境的限制性,决定了自治区人口＂大集中、小分散＂的基本分布格局,全区88.03%的人口集中在面积有限的25.75×104km2人居环境适宜地区,人居环境临界适宜地区占地43.84×104km2,人口不足全区的10%;人居环境不适宜地区占地48.66×104km2,人口仅占全区的2.24%。

英文摘要：

Natural environment for human settlements is not only closely related to living quality of human being,but also affects human social progress and human development level.Choosing terrain,climate,water and land cover condition as the evaluation factors,based on Geographic Information System technique,we set up the single-models,including relief degree of land surface model,temperature and humidity index model,water index and land cover index model,and comprehensive human settlements environment index model（HEI） to evaluate the natural environment suitability for human settlements in Inner Mongolia.The results show that in general Inner Mongolia are mainly in places with better topography,cool climate,and worse water and land cover condition.Analysis of the relationship between those natural factors with population showed that natural factor is important factors influencing regional population settlements.The HEI of Inner Mongolia generally decreases from southeast to northwest,and HEI is significantly correlated with population density at grid size and the correlation coefficient（r） between them reaches 0.87,which indicates that natural environment suitability for human settlements has a significant influence on population distribution.The statistical results shows that in Inner Mongolia,the percentage of non-suitable area,critical area and suitable area is 41.15%,37.07%,and 21.78%,respectively,implying that most areas of Inner Mongolia are mainly in places with bad natural environment.Population distribution at different types of natural environment suitability for human settlements shows that most people in Inner Mongolia mainly concentrate in areas with natural environment suitability.The total suitable area is 25.75×104km2,which accounts for nearly 21.78% of the total land area,while the proportion of people living in the area reaches 88.03%.The critical area is the transitional region for people to live in Inner Mongolia,which covers 43.84×104km2 with a population accounting for nearly 10% of the to