Study On The Land Use Change And It's Ecosystem Service Value In Dongting Lake Ecological Economic Zone

Ecosystem services are the crucial factors to ensure the development of human production,maintain regional ecological security and promote regional sustainable development.Land as a spatial carrier of ecosystem services,its utilization layout and spatial change have a direct impact on the ecosystem services value(ESV).With the rapid advancement of industrialization and urbanization,the intensity of land development and utilization has gradually increased,and the pattern of regional ecological environment and ecosystem has changed dramatically,which has caused a series of ecological problems,the contradiction between population,resources,environment and sustainable development has become increasingly prominent,which poses a threat to the stable operation of ecosystems.Land use and land use The research on the change of ecosystem service value has become a hotspot of current research.This paper used 25 counties of Hunan Province in Dongting Lake ecological economic zone as research areas.Based on the land use data from the 2000,2005,2010 and 2017,analyzed land use change.The spatial and temporal changes of ESV are quantitatively evaluated by using the equivalent factor table of unit area ESV proposed by Xie Gaodi et al.in 2015,and the ecological economy of Dongting Lake is put forward.The Grey correlation method and Pearson correlation coefficient were used to analyze the impact of land use on ESV.Suggestions on enhancing the value of regional ecosystem services.The conclusions of this paper are the followings:(1)From 2000 to 2017,the construction land and water area in the study area increased,while the cultivated land,forest land and unused land decreased,the grassland did not change significantly.Construction land and cultivated land changed the most,land use degree changed slightly,and land use level of each county unit remained basically stable.land use type transfer was happened at the total scale of 951.03 km2.The mian conversion area are cultivated land and forest land.The main types of land use conversion are cultivated land to construction land.(2)From 2000 to 2017,ESV of hunan Dongting Lake Ecological Economic Zone rised 2.29 billion yuan totally,experienced a general trend of rising first and then decreasing,finally rising,reaching a maximum of 4426.62 billion yuan in 2005.Forest land and water area ecosystem services accounted for the largest proportion.the contribution of hydrological regulation and climate regulation function to the value of regional ecosystem services ranks first.The high value areas of ecosystem services at grid level are concentrated in the middle of Dongting Lake area,and the sub-high value areas are Xiangjiang,Zijiang,Yuanjiang,Lishui basins and their surrounding areas.At County level,Yuanjiang,Xiangyin,Yueyang,Yunxi have the highest value of ecosystem services.The per capita ESV continued to decline,a total of 22.0941 million yuan per person,but the decline rate slowed down.(3)The results of grey relational analysis show that there is a significant correlation between land use types and the total value of ecosystem services in the study area,the order of relevance of land use type and ecological service value is: water area > forest land > cultivated land > unused land > grassland.Pearson correlation coefficient shows that there is a strong negative correlation between land use intensity and ecosystem service value.