The Ecosystem Service Function Evaluation Of City Drainage In Zhengzhou

The city is the space where human beings live and develop,strongly affected by human activities.water is a kind of special resources,supporting the whole life of the earth system,and water is the important foundation resources to the survival of human,and also is the important material base on which the social and economic development,water is closely related to the urban development,becoming the lifeblood of the city development.Urban drainage ecosystem not only provides human beings with essential water resources for production and life,fish and other aquatic products,hydroelectric power,inland shipping,protection of agriculture and forestry catchment irrigation,but also conservation of water,climate regulation,clean the environment,flood storage,in addition,also has the recreational and eco-tourism value,become the urban economy and the ecological basis of human habitation.The urban river network and the function are not perfect,water pollution,water quality degradation and other issues are very prominent in Zhengzhou.Therefore,it is not only possible to provide scientific basis for the planning and construction of water system,but also to provide data support for promoting the construction of good living environment,so as to promote the social and economic development of Zhengzhou.Based on the analysis of the concept,classification and evaluation methods of related ecosystem services at home and abroad,this paper takes the city of Zhengzhou as the research object,and uses ArcGIS10.1 and ENVI5.1 software to deal with the remote sensing images in 1995,2005 and 2015,The urban ecosystem ecosystems in Zhengzhou were classified,and the changes of different ecosystem types in 20 years were analyzed statistically.the function of the city water ecosystem,the function of providing products,the regulation function,the support function and the cultural service function,and the carbon fixation,oxygen release and cooling function of the vegetation are selected,the index system and evaluation model of urban water system ecosystem service value evaluation are constructed.System service value was evaluated.The results show that the value of urban ecosystem services in Zhengzhou is 35.585 billion yuan,of which the product function is 726 million yuan,accounting for 2.04%;the regulation function is 4.587 billion yuan,accounting for 12.89%;support function value is 2.86 billion yuan,accounting for 8.04%.The value of cultural services is 26.761 billion yuan,accounting for 75.20%;vegetation carbon storage function value of 269 million yuan,accounting for 0.76%;oxygen function value of 219 million yuan,Accounting for 6.15%;cooling function value of 163 million yuan,accounting for 0.46%,indicating that Zhengzhou urban water system ecosystem services mainly reflected in the cultural services function.Finally,the paper puts forward the application of ecosystem service function assessment to water resources management decision-making,provides scientific basis for the rational allocation and sustainable development of water resources,and puts forward the measures and corresponding countermeasures to improve the urban drainage ecosystem service function in Zhengzhou,in order to improve the management of Zhengzhou ecological drainage,and promote the development of social and economic development in Zhengzhou to provide some help.