Ecosystem Service Value Assessment Of Green Infrastructure

Green infrastructure is proposed based on social infrastructure and gray infrastructure.It emphasizes connectivity and multi-functionality,connects the urban living environment and green ecological space,breaks the boundary between the two,realizes multiple functions.At the same time,it promotes the coordinated development of society,economy and nature.In recent years,researches related to green infrastructure have mostly focused on qualitative analysis of living environment quality improvement,planning and construction,and quantitative value evaluation has also focused on the evaluation of its recreational value.There are few studies on the evaluation of the support,supply and adjustment functions of green infrastructure,so the evaluation of the ecosystem service value of green infrastructure can help to enhance the public’s environmental awareness.In 2019,the CPC Central Committee and the State Council planned to build the Yangtze River Delta Ecological Green Integration Demonstration Zone,which was officially approved in September of the same year.The demonstration area takes Dianshan Lake as the ecological green center to build the national key green infrastructure.Therefore,this paper selects Shanghai Dianshan Lake Scenic Area as the research object,constructs the ecosystem service value evaluation system of the study area with reference to the United Nations Millennium Ecological Assessment System,and determines the value evaluation model of different service indicators.The evaluation focuses on three aspects: First,atmospheric correction,cropping,and supervised classification of remote sensing image vector data in 2020 to determine the specific research scope and various land types and areas of Dianshan Lake Scenic Area,and obtaining real-time data will make the evaluation more time-effective and accuracy;the second is to integrate cultural functions into The research objects of tourism value and non-use value evaluation are divided into different groups.The former is conducted by tourists who have visited Dianshan Lake in the past three years.The evaluation value was calculated by the method,the remaining payment was determined by function fitting,the reliability and validity of the questionnaire phenotypic data were tested,and the logit model and Tobit model were regressed and compared to WTP and its influencing factors.The equivalent factor of ecosystem biodiversity value is calculated based on farmland food production as the base,and the factor is combined with the weight of each indicator obtained by FCE-AHP to calculate the ecosystem service value of Dianshan Lake.This value does not consider the specific land use types within the assessment scope It only focuses on the value of the main land types(wetlands)in the study area,so this value may underestimate the true value,but the ranking of each part of the indicators is still reasonable and meaningful,so the final overall Dianshan The lake ecosystem service value is ranked and compared with the indicators calculated by the two methods(combined with the value equivalent method of FCE-AHP and the MEA system evaluation method),and the final value is determined and the following conclusions are drawn:(1)Construct an evaluation system for the ecosystem service value of Dianshan Lake Scenic Area based on the four service functions,and analyze the employment opportunities,carbon sequestration and oxygen release,tourism and leisure,as well as its heritage,existence,and selection value according to the evaluation results.It is the most important four service indicators of Dianshan Lake Scenic Area.(2)After comparative analysis of the two evaluation methods,it is determined that the annual ecosystem service value of Dianshan Lake Scenic Area is 2,265,520,200 yuan,of which the annual direct use value is 1,877,732,300 yuan,and the annual indirect use value is 49,278,700 yuan.The annual non-use value is 338,509,200 yuan.Finally,the evaluation results are analyzed and corresponding policy suggestions are put forward.The study finds that on the one hand,in the ecological service value of Dianshan Lake Scenic Area,the ecological environment and cultural heritage have higher service value,which needs to be further excavated and constructed;The water quality test results of the lake are still unsatisfactory,and it has a great responsibility as a water source in Shanghai,and the lake water environment needs to be further improved.This requires relevant departments to protect the ecological environment and cultural heritage of the scenic spot while developing the tourism resources of the scenic spot,so as to enhance the public’s awareness of ecological environmental protection,so that tourists can more consciously protect the environment of the scenic spot while enjoying the beautiful scenery.resource.Through the value assessment of Dianshan Lake Scenic Area,we will thoroughly implement the concept of sustainable development,and help accelerate the realization of the "double carbon" goal and the steady growth of "green GDP".22 figures,32 tables and 130 references are included in this paper.