济南市邢家渡灌区废弃沉沙池生态风险等级评价研究

STUDY ON THE GRADE EVALUATION OF ECOLOGICAL RISK IN WASTE SAND BASIN OF XING JIADU YELLOW RIVER IRRIGATION AREA IN JINAN

济南市邢家渡沉沙池曾是黄河下游邢家渡引黄灌区上的一个主干沉沙池,运行近30年,于2002年停止使用,沉沙池约204 hm2的土地彻底废弃,已成为济南市区风沙的源头之一.研究废弃沉沙池生态风险等级,对区域开发、环境治理有重要的意义.利用ARCGIS软件,选取风蚀模数,植被覆盖度,土壤含沙量三个评价指标,利用条件过滤法,进行生态风险等级评价研究.结果表明,中度风险、较重风险、重度风险的面积,占废弃沉沙池总面积的92.92%,生态风险较高,该区域生态安全状态总体评价为不安全.

The waste sand basin of Xing Jiadu in Jinan was a major desilting basin in downstream of the Xing Jiadu Yellow River irrigation area, before and after operation for nearly 30 years, it had stopped using in 2002, and there are about 204 hm2 land was abandoned, which had become sandstorm source of Jinan. Study on waste sand basin ecological risk level, has important significance to the regional development, environmental governance. Using ArcGIS software, three evaluation index of the wind, erosion modulus, vegetation coverage and soil sand content was selected to evaluate the ecological risk level by using conditional filtering method. The results showed that the area of moderate risk, heavy risk and severe risk are accounting for 92.92% of the total area of the waste sand basin. Ecological risk is relatively high, and the regional ecological security status of the overall assessment is not safe.