Study On Evaluation Of Soil Ecosystem Services In The Process Of Urbanization

In the past few decades,China's urbanization has developed very rapidly.As one of the most important social processes,urbanization has brought about various environmental impacts,especially soil ecological problems,while bringing about social and economic development.As an important resource closely related to human health,soil provides a variety of services for human beings,namely soil ecosystem services.However,at present,the impact of urban development on soil ecology has not received sufficient attention and there is little research on soil ecosystem services.Therefore,it is of practical significance to study the impact of urbanization on soil ecosystem services.This study establishes an evaluation index system to evaluate the soil ecology in the process of urbanization from the perspective of soil ecosystem services,in order to analyze the factors affecting the soil ecosystem services from the overall level.Under the premise of ensuring urban development and economic growth,it puts forward policies and suggestions for protecting soil ecological security in urban areas,in order to reduce the impact of urbanization on soil ecology and enable cities to achieve sustainable development.The main content is in the following:(1)Establish a preliminary index system based on PSR model with pressure,state and response as the Project layers,by referring to literatures related to urbanization and soil ecosystem services.After that,23 evaluation indicators were optimized and screened based on the principles of representativeness and similarity,then the final evaluation index system was determined.(2)Collect and summarize the relevant indicators data of Dalian,calculate the weight value of Dalian evaluation indicators,and evaluate the soil ecology of Dalian by fuzzy comprehensive evaluation.Finally,the conclusion that the soil ecosystem services state of Dalian is medium deviation is obtained.Through the comprehensive evaluation values of all levels of indicators and IPA analysis charts,the main influencing factors of soil ecosystem services in Dalian are vegetation coverage,soil heavy metal adsorption,soil conservation amount,available proportion of land,urbanization level and soil fertility index;the key improvement factors are urbanization level,proportion of construction land,soil fertility index,available proportion of land,soil heavy metal adsorption and carbon storage.(3)According to the evaluation and analysis results,the following improvement measures are proposed:(1)Adjusting the speed of urban development and improve the soil management system.(2)Increasing the extent of land intensive use.(3)Protecting urban soil resources(cultivated land and green land),improve protection and compensation mechanisms,and strengthen green space construction.(4)Increasing environmental protection investment,increase pollutant treatment and improve emission management system.(5)Improving people's awareness and attention to soil ecosystem services and regional soil ecological protection.This paper provides a reference for quantifying soil ecosystem services in the process of urbanization.In the future,further studies should be carried out on the influencing mechanism of urbanization on ecosystem services.