基于土地利用/覆被变化的贵阳市红枫湖水源保护区生态风险演变

以贵阳市饮用水源地红枫湖保护区为研究对象，基于1991年，2007年，2013年3期TM遥感影像解译数据，从生态风险评价的角度出发，利用ArcGIS，ERDAS IMAGINE平台，通过逐网格采样和空间克里金插值方法，研究红枫湖保护区不同时间范围内的土地利用变化及区域景观生态风险演变。结果表明:近22 a主要以中间等级生态风险为主，1991—2007年低生态风险、较低生态风险和中生态风险所占面积比例均下降。2007—2013年低生态风险、较低生态风险和高生态风险面积比例均呈现上升趋势。土地利用转移则以林地、耕地、建设用地最为显著，耕地总体呈现降低趋势，而林地、建设用地总体则呈现上升趋势。

Land Use/Cover Change and Its Landscape Ecological Risk Evolution in the Drinking Water Source of Hongfeng Lake in Guiyang

The drinking water source of Hongfeng Lake in Guiyang City was selected as the study area. Based on three different periods of TM remote sensing image interpreting data in 1991, 2007 and 2013: from the angel of ecological risk assessment, using ArcGIS, ERDAS IMAGING terrace, and according to network sampling and Kriging interpolation we examined the changing of land utilization and regional landscape ecological risk in different time and range of Hongfeng Lake district. The results showed that the main ecological risk grade was moderate in recent 22 years. The area ratios of extremely low ecological risk, low ecological risk and moderate ecological risk fell slightly during the periods from 1991 to 2007. However, the area ratios of extremely low ecological risk, low ecological risk and extremely high ecological risk increased dramatically during the periods from 2007 to 2013. The transfer of land utilization mainly occurred in woodland, construction lands which present the ascendant trend and arable land which showed the decline trend.