Research On The Spatio Temporal Changes Of Ecosystem Services In Ha-Chang Urban Agglomeration

As the foundation of human survival and development,ecosystem services not only provide life necessities for mankind,but also maintain the earth’s life support system,playing an important role in the sustainable development of regions,countries and the world.However,due to human lack of understanding of ecosystem services and their relationships,excessive disturbance has led to the degradation of certain ecosystem services,which has seriously threatened regional and global ecological security.The Harbin-Changzhou urban agglomeration is the first of the nine regional urban agglomerations(national secondary urban agglomerations)in my country.It is an important production base for my country’s forestry,food and animal husbandry,as well as an important ecological protection area in my country.It has the characteristics of excessive human interference,high degree of land development,fragile ecological environment and relatively backward social and economic development.In recent years,due to unreasonable local human activities,local residents lack awareness of the importance of ecosystem services,the process of urbanization has intensified,and human demand for ecosystem services has continued to increase.The ecological security and economic development of the Harbin-Changsha urban agglomeration have been affected..In this study,the Harbin-Changzhou urban agglomeration was used as the research area,and the InVEST(integrated valuation of ecosystem services and trade-offs)and other ecological models were used as the basis to study the land cover changes and changes in the research area and each city and state in 2000,2010 and 2015.The law of its change;the four services of carbon storage,water production,soil conservation and habitat quality are evaluated,and the temporal and spatial change pattern of ecosystem services are analyzed;finally,the influencing factors and degree of influence of ecosystem services in the study area are explored based on the geo-detector model.The following are the main results:(1)The land cover of all cities and prefectures in the Ha-Chang urban agglomeration is dominated by arable land and woodland.The area of woodland,wetland and construction land increased during 2000-2015,while the area of other types continued to decrease,and the changes were mainly concentrated in the period2000-2010;The change of construction land is mainly concentrated in 2010-2015,and the dynamic degree is not large.The latter is less than the former in bare land,and the others are greater in the later period than in the earlier period.In terms of change,the wetland area of Qiqihar city continued to decrease,the cultivated land area of Daqing city and Mudanjiang city increased first and then decreased,the forest land area of Suihua City and Yanbian Korean Autonomous Prefecture continued to decrease,the forest land area of Songyuan City and Changchun City increased first and then decreased,and the cultivated land area of Siping City and Liaoyuan city continued to decrease.(2)In 2000,2010 and 2015,the carbon storage service,water supply service,soil conservation service and habitat quality service of the study area and each city and state all had interannual dynamic changes.Taking 2010 as the inflection point,carbon storage services in the study area showed a trend of first decreasing and then increasing;water supply services and habitat quality services showed a trend of first increasing and then decreasing;soil conservation services showed a trend of continuous decreasing.From the perspective of cities and prefectures,the carbon storage services of Suihua,Harbin,Mudanjiang and Jilin cities show the same change trend as the study area,which first decreases and then increases;the water supply services of Songyuan,Changchun,Jilin and Liaoyuan cities show the same change characteristics as the study area,which first increases and then decreases;the soil conservation services of Yanbian Korean Autonomous Prefecture show the same change trend Except Qiqihar city and Daqing City,the habitat quality service of 9cities and prefectures in 11 cities and prefectures had the same change characteristics with the study area,showing the trend of first increasing and then decreasing.(3)In 2000,2010,and 2015,the ecosystem services of the study area changed regularly in space and time,and these changes were affected by natural and human factors.The results of the study found that most of the high-value areas for carbon storage services,soil conservation services,and habitat quality services are concentrated in the eastern part of the study area.This area has a large vegetation coverage,mainly forest land,and human disturbance is relatively small.The structure,process and function are relatively stable.Synthesize the changing laws and influencing factors of ecosystem services,formulate ecosystem management strategies for the Ha-Chang urban agglomeration,and provide scientific guidance for the sustainable development of the area.