中文摘要：

采用地统计学方法并结合空间自相关指数Moran’sI对漫湾水电站建设前后区域景观生态风险指数的时空分异特征进行分析，通过对风险指数的影响因子相关性分析，确定漫湾水电站的建设对区域景观生态水平的影响。结果表明：1）漫湾水电站建设期研究区景观生态风险水平显著升高，随着水电站的运营，在采取相应的环境保护措施后，高风险区域面积相对减小；2）漫湾水电站建设前后研究区的景观生态风险值在空间上具有中等程度空间自相关性，水电站建设及运行后人类干扰等随机因素对生态风险的影响相比建设前增大。选取综合地形指数（CTI）、坡度位置、与漫湾电站的直线距离、与河流的距离、与主干道的距离、海拔高度作为变量，分别与各栅格单元的景观生态风险指数作相关分析。水坝建设前生态风险与河流等自然环境显著相关；水坝建设期间生态风险度的相关因子众多，作用复杂；水坝建成后生态风险度与距漫湾水电站的距离、海拔高度显著相关。

英文摘要：

The present paper is aimed to introduce our study predic- tions on the spatio-temporal variation of the landscape ecological risks confronted by Manwan hydropower station under construction by using geo-statistical method combined with Moran＇ s I index. Our study also attempts to explore the influential factors of the risk index through correlation analysis to produce an assessment of the impact of the con- struction of the station on the landscape eeological risk. The results of our study show that： （1） Caleulating the construction site at various levels twice in 1988 and in 2004 and comparing the changing varia- tion of the ecological risk levels from 1974 to 2004 reveals that 79.5 % of the area involved the sharpening of spatio-temporal land- scape eeological risks from low-level risk to higher ones from 1974 to 1988, whereas the area suffering from the risk sharpening from lower level to high level involves only 27.2 %, much lower than that in the previous period. The statistics demonstrates that the ecological risk level remarkably grows in the area under study due to the construction of the station, though the risk levels of the area were somewhat low- ered with the adoption of measures for environmental protection, sueh as the development of green-vegetation projects; （2）The spatial auto- correlation analysis we have done reveals that the ecological risk re- mains high as the result of the hydroelectric station construction and the eco-environment protection operation taken due to the human in- terference. We have done the correlation analysis oriented respective- ly in study of each grid cell ecological risk value by choosing compre- hensive topographic indexes （CTI）, the slope position, the straight distance to Manwan hydropower station, the distance to the river, and those of the distance to the main road and altitude as variables, and discovered that： Before the construction, the ecological risk was cor- related merely with the natural environment, for example, to the river condition.