Construction and demonstration of ecological environment vulnerability evaluation index system in Yangtze River Delta urban agglomerations

Considering the regional differences of the Yangtze River Delta urban agglomeration, the ecological environment vulnerability assessment differences index system of the Yangtze River Delta urban agglomeration was constructed based on the sustainable development pressure-state-response (PSR) model, and then the maximum relevance and minimum redundancy (mRMR) algorithm, set pair analysis, entropy weight method and so on were comprehensively used. Meanwhile, the vulnerability level of the ecological environment was comprehensively measured and analyzed. The empirical results show that: 1) The index system contains key basic indexes and regional characteristic indexes can reflect the vulnerability of the Yangtze River Delta urban agglomeration. 2) The overall level distribution of the ecological environment vulnerability index of the Yangtze River Delta urban agglomeration is relatively balanced. 3) There are obvious differences in air pollution, population pressure and environmental protection among provinces and cities in the region, among which Shanghai and Hefei have the largest population pressure; Anhui province has the worst air pollution; Environmental protection is the weakest in Jiangsu.