Study On The Evaluation And Evolvement Of Eco-environmental Vulnerability In The Yellow River

The Yellow River Delta wetland has the characteristics of geographical location,rich natural energy and diversification of species,which not only provides the material basis for the social economy and human beings' survival,but also the valuable resources to maintain the regional ecological health.Due to climate change,the variation of water and sediment in the lower reaches of the Yellow River and the excessive exploitation and utilization of wetland resources,the ecological environment has caused serious damage,leading to wetland pollution,soil acidification and natural wetland area decreasing year by year,showing the vulnerability of ecological environment system.Researching on the vulnerability assessment and evolution characteristics of wetland ecological environment in the Yellow River Delta.Revealing the main driving factors influencing the ecological environment fragility of the Yellow River Delta.Analyzing the actual situation of the wetland ecological environment and the characteristics of the regional fragility in the Yellow River Delta.Providing a theoretical basis for the protection and management in the Yellow River Delta.Project research on the rational use of wetland and ecological construction has played a vital role.Based on the comprehensive analysis of the sustainable development goals and tasks of the wetland in the Yellow River Delta,the evaluation index system of the ecological environment vulnerability of the Yellow River Delta in four levels was established.Evaluating ecological environment vulnerability of Wetland by using the catastrophe progression method and the fuzzy comprehensive evaluation method.Through the evaluation of 1983 to 2010,the Yellow River Delta wetland ecological environment vulnerability was mostly fragile,severe vulnerability after 2011.The evaluation of the two methods are basically the same,with certain accuracy.The factors of ecological environment in the Yellow River delta wetland vulnerability was driven by principal component analysis with SPSS19.0 software.The four main components with the cumulative contribution rate of 82.457% were extracted.The conditional of water and sediment,vegetation soil and meteorological condition,the level of social development is the main driving force of the ecological environment vulnerability ofwetland in the Yellow River Delta.The driving force of water and sediment is the first driving force.Researching the evolution characteristics of wetland ecological environment vulnerability in the Yellow River Delta based on the theory of information entropy.The results show that the overall trend in the information entropy was increasing.Combining grey correlation analysis and dynamic changes of wetland ecological environment vulnerability factors with relatively high correlation,mainly for runoff,sediment concentration,average annual precipitation,maximum and minimum temperature and population density.In the dynamic relationship between wetland spatial variation and vulnerability,the wetland area is negatively correlated with wetland ecological vulnerability In wetland landscape pattern,marsh wetland,beach wetland and reservoir pond wetland are associated with ecological vulnerability the degree is relatively high.