基于熵权TOPSIS法的耕地生态质量空间分布格局及主控因子分析——以河南省新郑市为例

Spatial distribution and dominating factors analysis of ecological quality of cultivated land based on entropy-weighting TOPSIS method: A case study of Xinzheng City,Henan Province

耕地生态质量评价及其主控因子分析是耕地可持续利用的基础。文章以河南省新郑市为例,从自然禀赋、生态压力、生态效益3个方面构建耕地生态质量评价指标体系,采用熵权TOPSIS法,并结合GIS空间分析法,对耕地生态质量进行评价,并借助障碍度模型提取耕地生态质量的主控因子。结果显示,新郑市耕地生态质量状况整体良好,呈现东部、西南部与西北部高,城区南部与北部低的趋势。其中,Ⅰ等耕地占耕地总面积的25.44%,Ⅱ等耕地占耕地总面积的41.94%,Ⅲ,Ⅳ,Ⅴ等耕地分别占耕地总面积的8.15%,9.33%和15.14%。该市耕地生态质量的主控因子是林网化比例、人均粮食产量、土壤综合污染指数、土壤有机质含量、有效土层厚度。

Evaluation of ecological quality of cultivated land and analysis of its influence factors would be helpful for the sustainable utilization of cultivated land. In the present study, Xinzheng City in Henan Province was chosen as the study area, and an evaluation index system for cultivated land quality including 13 evaluation indices was con- strueted from the perspectives of natural resources, ecological stress and ecological benefits. The ecological quality of cultivated land in ：Xinzheng City was evaluated by entropy-weighting TOPSIS method and GIS spatial analysis, and dominating factors influencing the ecological quality of cultivated land were explored via obstacle degree model. It was shown that the overall ecological quality of cultivated land in Xinzheng City was good. The cultivated land in the east, southwest and northwest of Xinzheng City exhibited a higher ecological quality, while that in the south and north around city showed a lower ecological quality. Proportions of 1 st, 2nd, 3rd, 4th and 5th class cultivated land were25.44% , 41.94%, 8.15% , 9. 33% and 15.14%, respectively. The dominating factors of the ecological quality of cultivated land in Xinzheng City were the forest network proportion, per capita grain yield, synthetic index of soil pollution, soil organic matter content and thickness of soil layer.