Hu Jin Long, Zhou Zhi Xiang, Teng Ming Jun, Luo Nan
College of Tourism, Guilin University of Technology, Guilin 541004, Guangxi, China.
College of Horticulture &Forestry Science, Huazhong Agricultural University, Wuhan 430070, China.
Ying Yong Sheng Tai Xue Bao. 2017 Jun 18;28(6):2003-2012. doi: 10.13287/j.1001-9332.201706.001.
Taking Lijiang River basin as study area, and based on the remote sensing images of 1973, 1986, 2000 and 2013, the land-use data were extracted, the ecological risk index was constructed, and the characteristics of spatiotemporal variation of ecological risk were analyzed by "3S" technique. The results showed that land use structure of Lijiang River basin was under relatively reasonable state and it was constantly optimizing during 1973-2013. Overall, the ecological risk of Lijiang River basin was maintained at a low level. Lowest and lower ecological risk region was dominant in Lijiang River basin, but the area of highest ecological risk expanded quickly. The spatial distribution of ecological risk was basically stable and showed an obvious ring structure, which gra-dually decreased from the axis of Xingan County Town-Lingchuan County Town-Guilin City-Yangshuo County Town to other regions. Region with lowest ecological risk mainly distributed in natural mountain forest area of the north and mid-eastern parts of Lijiang River basin, and region with highe-st ecological risk concentrated in Guilin City. The ecological risk distribution of Lijiang River basin presented significant slope and altitude differences, and it decreased with increasing slope and altitude. During the study period, the area of low ecological risk converted to high ecological risk gra-dually decreased and vice versa. On the whole, the ecological risk tended to decline rapidly in the Lijiang River basin.
以漓江流域为研究区域，基于1973年、1986年、2000年和2013年的遥感影像，提取土地利用数据，构建生态风险指数，并运用“3S”技术分析生态风险的时空变化特征。结果表明，漓江流域土地利用结构处于相对合理状态，且在1973—2013年期间不断优化。总体而言，漓江流域生态风险维持在较低水平。低生态风险区和较低生态风险区在漓江流域占主导地位，但高生态风险区面积增长迅速。生态风险空间分布基本稳定，呈明显的环状结构，由兴安县县城—灵川县县城—桂林市—阳朔县县城轴线向其他区域逐渐降低。最低生态风险区主要分布在漓江流域北部和中东部的天然山林地区，最高生态风险区集中在桂林市。漓江流域生态风险分布呈现出显著的坡度和海拔差异，且随坡度和海拔升高而降低。研究期间，低生态风险区向高生态风险区转化的面积逐渐减少，反之亦然。总体上，漓江流域生态风险呈快速下降趋势。
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