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采用地统计学方法并结合空间自相关指数Moran’s I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。
Using geostatistics and spatial autocorrelation index Moran’s I to analyze the temporal and spatial differentiation characteristics of regional landscape ecological risk index before and after construction of Manwan Hydropower Station, and through the correlation analysis of influence factors of risk index to determine the construction of Manwan Hydropower Station Impact of Regional Landscape Ecology. The results show that: 1) The landscape ecological risk in the research area of Manwan Hydropower Station increased significantly during the construction period. With the operation of hydropower stations, the area of high-risk areas decreased relatively after taking corresponding environmental protection measures; 2) Before and after the construction of Manwan Hydropower Station The landscape ecological risk in the study area has a moderate degree of spatial autocorrelation in space, and the impact of stochastic factors such as hydropower station construction and human disturbance after operation on ecological risk increases compared with that before construction. The CTI, slope position, straight line distance to Manwan power station, distance to river, distance from main road and altitude were selected as variables to correlate with landscape ecological risk index of each grid unit. The ecological risk before dam construction is significantly related to the natural environment such as rivers. There are many related factors and complex functions of ecological risk during dam construction. The ecological risk degree after dam construction is significantly related to the distance and altitude of Manwanwan Hydropower Station.