Study On The Sustainability Of Service Function Of Typical Ecosystem In Guilin

As one of the first batch of national sustainable development innovation demonstration zones,Guilin has a s Tab resource pool,energy pool and rich biodiversity.In recent years,due to the increasing demand for the use of ecological landscape resources and the accelerated urbanization process,the intensity of land use and development in Guilin City is large,and many ecosystem services are facing serious challenges.How to accurately evaluate the spatiotemporal change characteristics of ecosystem service functions and analyze its development strategies in combination with regional characteristics,so as to maximize the ecosystem services and maintain the sustainability of its service functions,is the key and difficult point of the current research on the sustainable development of ecosystem service functions in Guilin.In this study,three typical ecosystem service functions were selected to evaluate the distribution status and evolution of regional ecosystem service functions,and various spatial analysis methods and land use transfer matrix were used to identify regional typical ecosystem service function zoning.By coupling the In VEST model and Geo SOS-FLUS model,the ecological service protection and land use planning are linked,and the simulation study of the sustainable development scenario of the ecosystem service function based on land use is carried out.The research results are intended to provide guidance for the construction of Guilin National Sustainable Development Demonstration City and land use planning.The main conclusions are as follows:(1)The total carbon reserves of Guilin City from 2000 to 2020 showed a trend of"decreasing year by year",showing the overall spatial distribution characteristics of"higher in the northwest,southwest and east,and lower in the northeast,southeast and central".The extremely important area of carbon storage in Guilin is determined as the priority protection area of carbon storage resources.Compared with the natural development scenario,the forest land in Guilin is effectively protected under the ecological protection scenario,and the expansion of construction land is limited.After taking ecological protection measures,the total carbon storage of Guilin in 2040 is predicted to reach 552.16×10~6t,increased by 4.72×10~6t compared with the natural development scenario in 2040,the regional carbon sequestration capacity has been enhanced under the ecological protection scenario.(2)From 2000 to 2020,the water supply capacity of Guilin City showed a downward trend,showing the overall spatial distribution characteristics of"high in the east and low in the west,high in the middle and low in the north and south".The water yield critical area in Guilin is determined as the priority protection area for water supply.Compared with the natural development scenario,the forest land and cultivated land in Guilin are effectively protected under the ecological protection scenario,and the expansion of construction land is limited.After the adoption of ecological protection measures,the average water yield of Guilin in 2040 is predicted to reach 698.19mm,which is 7.23mm higher than the natural development scenario in 2040,and the regional water supply capacity under the ecological protection scenario is enhanced.(3)The biodiversity index of Guilin City showed a downward trend from 2000 to 2020,showing the overall spatial distribution characteristics of"higher in the northwest,southwest and east,and lower in the northeast,southeast and central".The extremely important area of biological diversity in Guilin is determined as the priority protection area of biological diversity.Compared with the natural development scenario,the forest land and wetland under the ecological protection scenario are effectively protected,and the expansion of construction land and cultivated land is limited.After the adoption of ecological protection measures,the annual average of the biodiversity index in Guilin in 2040 reached 0.872,an increase of 0.013compared with the natural development scenario in 2040.The ecological protection measures effectively protected the biodiversity.