摘 要 ：以农牧交错带的典型区域——内蒙古翁牛特旗为研究对象，基于景观结构中的景观干扰度指数和景观脆弱度指数构建区域生态风险指数，并借助空间统计学中的空间自相关和半方差分析方法，进行区域生态风险空间分布和梯度变化特征分析，得出如下结论：（1）研究区内的生态风险度存在着一定的正相关关系，并随着粒度增大，呈现出下降的趋势；（2）1985~2000 年的15 a 中，研究区生态环境质量整体有所下降，生态风险指数较高的地区有所增加；（3）研究区内的沙地坨甸区生态风险度高，相邻区域的生态风险度也较高；（4）研究区生态风险指数空间分异的步长都比较大，为410. 9 km。
Abstract:This paper describes a case study of eco-risk appraisal in the Ongniud Banner, an agro-pastoral transitional area in Inner Mongolia. The appraisal was conducted based on landscape disturbance index and landscape fragility. Spatial distribution and gradient differentiation characteristics of the eco-risks in the study area were analyzed by means of spatial statistics like spatial autocorrelation and sub-analysis of variance. Conclusions from the study are as follows: (1) Eco-risk degree was positive correlation, and a decreasing trend exits with the increase of grain size of landscape patches. (2) Eco-environment quality dropt to a small extent while and the area with high eco-risk enlarged in the period from 1985 to 2000 in Ongniud Banner. (3) Eco-risk degree in the east-middle lump of sand and its peripheral regions were high. (4) The step length of the eco-risk index’s spatial differentiation is quite long (410.9 km).