Study On Land Use Change And Ecosystem Service Value In The Upper Reaches Of Yangtze River Basin

With rapid economic development and increased urbanization,land resources as the most basic element for the survival and development of human society and ecological environment,are gradually becoming natural resources that human compete for,the shift in land use type has some impact on the structural function of ecosystems in the region,exploring the relationship between land use change and the value of ecosystem services is an important channel to promote the construction of ecological civilization.It is also an important driving force for regional economic development.This paper takes the upper Yangtze River basin as the subject of study,a total of five periods of land use data were selected for 2000,2005,2010,2015 and 2020.The spatial-temporal change characteristics of land use transition were revealed by using land use transfer matrix,single and comprehensive land use dynamics and land use comprehensive degree,etc.,the spatial-temporal variation of ecosystem services was analyzed by equivalent factor method,and the spatial-temporal variation of ecosystem services was studied by combining GIS technology and In VEST model habitat quality,to cope with the changes brought by human activities on the transformation of land use,rational optimization of land resources,improve the quality of the ecological environment,improve the construction of the ecosystem.The results show that:(1)From 2000 to 2020,the ecological space of land use in the upper reaches of the Yangtze River is the largest,followed by production space and living space.the area of land use types from large to small were grassland,forest land,arable land,unused land,construction land and water area.On the transfer of land use type,the forest land area increased the most by 10353.933hm~2,the unused land had the largest transferred area,by 9791.6731 hm~2.The change range of land use composite index was the largest in 2005-2010;(2)In 2000,2005,2010,2015and 2020,the ecosystem service values of the upper reaches of the Yangtze River basin were RMB 973.353 billion,RMB 1,518.538 billion,RMB 237.218 billion,RMB161.821.87 billion and RMB 317.4342 billion,respectively.The ecological contribution of forest land is the largest,followed by grassland,water area,cultivated land and unused land.The spatial distribution of ESV from 2000 to 2010 was mainly distributed in high value areas and higher value areas,and from 2015 to 2020 was mainly distributed in higher and general values;(3)In the spatial distribution characteristics of Habitat Quality at the study area,the lower value range of habitat quality was located in the middle of the study area,while the higher and higher habitat quality areas were cross-distributed around the lower value range.Based on the above research,and combined with the characteristics of multiple ecosystem services provided by land use changes in different time and space,the ecological environment quality of the upper reaches of the Yangtze River basin was improved,in order to promote the rational development and utilization of land resources,optimize the land spatial structure to provide sustainable development ideas.