Evaluation of land ecological security and diagnosis of obstacle factors in City A based on PSR model
In this study,the land ecological security evaluation index system was constructed based on the PSR model,and the entropy weight method was objectively assigned,combined with the comprehensive index method and the barrier factor diagnosis model.The development status of land ecological security in A city from 2006 to 2021 was evaluated,and the barrier factors were analyzed.The results showed that,from 2006 to 2021,the comprehensive index of land ecological security in the city showed a slow decline and then a rapid rising trend,and the security level increases from Class Ⅲ to Class Ⅳ,reaching a safer level.The sub-system land ecological security index changed significantly,and the pressure index showed a downward trend from 2006 to 2015,and then began to rise.The status index steadily increases,showed a positive development.The response index showed a fluctuating upward trend,the obstacle degree of the pressure layer of land ecological security continues to increase,and the obstacle degree of the state layer and the response layer decreases,and the obstacle degree was gradually shifted from the state layer and the response layer to the pressure layer.The main obstacle factors were the amount of pesticide application,chemical fertilizer application,and the density of the population.
land ecological securityPSR modelentropy weight methodcomprehensive index methodobstacle factors
万方数据
维普
