贵州耕地生态安全评价及障碍因子分析

Ecological Security Evaluation and Obstacle Factor Analysis of Cultivated Land in Guizhou Province

基于PSR模型构建耕地生态安全评价指标系统,借助熵权法、线性加权法及障碍度评价模型,对贵州2001—2020年的耕地生态安全状况进行评价。结果表明:2001—2020年,全省的耕地生态安全数值在波动变化中逐步增长;压力系统数值变化呈“先升后降”态势;状态系统数值变化呈“V”型;响应系统数值逐年稳定增长。2001—2020年,压力系统障碍度变化与响应系统数值变化呈负相关,状态系统障碍度平稳增长;未来压力系统将成为主要障碍层。第一产业占GDP比、人口自然增长率、农药使用量、化肥使用量等指标是影响全省耕地生态安全的重要因子。

The article constructs an evaluation index system for ecological security of cultivated land using the PSR model,and evaluates the ecological security status of cultivated land in Guizhou Province from 2001 to 2020 using entropy weight method,linear weighting method,and obstacle evaluation model.The results indicate that from 2001 to 2020,the ecological security value of cultivated land in the province gradually increased in fluctuations;the trajectory of numerical changes in the pressure system shows a′first rise and then fall′pattern;The numerical variation of the state system shows a′V′shape;the response system values have steadily increased year by year.From 2001 to 2020,there was a negative correlation between the changes in pressure system barriers and the numerical changes in response systems,while the barriers in state systems increased steadily;the future pressure system will become the main obstacle layer.Indicators such as the ratio of primary industry to GDP,natural population growth rate,pesticide use,and fertilizer use are important factors that affect the ecological security of cultivated land in the province.