Land Use Change And Evaluation On Ecosystem Service Value Of Poyang Lake Ecological Economic Zone

LUCC is one of the important causes and driving factions of global changes,which directly affects the course of the structure and function of ecosystem,which led to changes in the value of ecosystem services.Poyang lake ecological economic zone is not only a rapidly developing industrialization and urbanization zone,but also an important ecological protection zone.In recent years,along with the accelerated population growth,economic and social development speed,the natural ecological environment of the Poyang lake ecological economic zone has been seriously disrupted,resulting in a loss of ecological function of the original,regional environmental issues is increasingly prominent.Therefore,based on the vector data interpreted by remote sensing of Poyang lake ecological economic zone in 2005,2010 and 2013,the paper analyzed the land use changes from 2005 to 2013.the calculation formula of ecosystem service value revised by Costanza is adopted and the ecosystem service value of Poyang lake ecological economic zone is estimated,as well as its temporal and spatial variation characteristics during these years are analyzed,which is based on the revision on "the equivalent value per unit area of ecosystem services in China" of Xie Gaodi.It shows that from 2005 to 2013,there is a decrease of the acreage of grassland,cropland,woodland and unused land in Poyang lake ecological economic zone,meanwhile,there increased the acreage of construction land as well as water.From 2005 to 2013,the land use degree composite index of the Poyang lake ecological economic zone fell first and then rose.On average,the composite index was 246.58%.It means the land use development degree is relatively high,but in terms of area,the land use degree change of the Xingzi county,Duchang county and Yongxiu county is less than zero.It shows that the land use level of countries is in development except these three countries.Obviously,the land use change of Poyang lake ecological economic zone has differences between religions.In Yugan country,Guixi county,Payang county,Nanchang county and Hukou county,the changes of grassland,farmland,construction land,woodland,water and unused land are the most significant.During the same period,the ecosystem services value of Poyang lake ecological economic zone increased at first and decreased later,in which biodiversity conservation,waste treatment,water conservation,the formation and protection of oil and biodiversity conservation are the main ecosystem service functions and the total value of these is more than 55% of the total ecosystem service value;There are obvious differences of the average regional ecological service value in all regions.In 2005-2013,apart from Yugan county,Yongxiu county,Duchang county,Poyang county and Jinxian county where there is an increase of average regional ecological system service value,yet in the other counties and cities,the average regional ecological system serves value is decreasing and among this,Xingzi county and Jiujiang city have the highest loss.