辽宁省朝阳县自然生态系统恢复力评价

Evaluation of natural ecosystem resilience in Chaoyang County,Liaoning Province

随着国土空间生态修复在我国全面展开,自然生态系统恢复力评价成为指导地方生态修复分区和修复措施的重要前提和支撑。以辽宁省朝阳县生态环境特点为基础,筛选出NPP、NDVI、人口密度等12个评价指标,利用ArcGIS结合AHP-TOPSIS组合赋权法对其2020年的自然生态系统恢复力进行研究。研究结果表明,朝阳县自然生态系统恢复力指数均值为0.75,生态恢复力总体水平处于“一般”等级;朝阳县的自然生态系统弱和较弱恢复力区域面积占比总计达到28.05%,主要分布在工业发达、人口稠密的城乡住宅用地、农业区和矿山开采破坏区域,其中大庙镇是生态恢复力最弱的一个乡镇,占比为9.81%,地理分布上呈现出自西北向东南逐步升高的空间特征;朝阳县生态恢复力莫兰指数为0.56,反映朝阳县生态恢复力有一定的空间正相关性,并基于局部空间自相关结果将研究区划分为3个生态修复分区。

With the comprehensive development of land space ecological restoration in China,the evaluation of natural ecosystem resilience has become an important premise and support to guide local ecological restoration partitions and restoration measures.Based on the characteristics of the ecological environment of Chaoyang County,Liaoning Province,12 evaluation indicators such as NPP,NDVI,and population density were screened.The ArcGIS combined with AHP-TOPSIS combination weighting method was used to study the natural ecosystem resilience in 2020.The results show that the average value index of the natural ecosystem resilience index of Chaoyang County is 0.75,and the overall level of ecological resilience is at the"general"level;the total proportion of areas with weak natural ecosystem and weak resilience in Chaoyang County reaches 28.05%,mainly distributed in industrial developed,densely populated urban and rural residential land,agricultural areas,and mining damaged areas.Among them,Damiao Town is the town with the weakest ecological resilience,accounting for 9.81%.Geographically,it presents a spatial feature of gradually increasing from northwest to southeast;the Molan Index of Chaoyang County ecological resilience is 0.56,which reflects the positive correlation of the ecological resilience of Chaoyang County.Based on the results of local spatial autocorrelation,the study area is divided into three ecological restoration zones.