Emergy Analysis And Evaluation Of Huainan Eco-economic System

Emergy analysis was one method that analyzes the ecological economic system.The researches on the mineral area were relatively less,so the paper tried to apply this method to the resource-dependent mineral city of Huainan,combining with related geographic information knowledge.Taking Huainan,Anhui Province as the study area,the paper calculated the five factors in the RUSLE model by utilizing a series of data such as digital elevation model(DEM),rainfall,RS images,soil with RS and GIS and obtained the characteristics of spatial-temporal differentiation of soil erosion of Huainan from 2000 to 2014.Secondly,the paper expounded the energy flow of Huainan and used emergy method to study three subsystems of Huainan,which included the social,economic and environmental subsystems.Then the paper applied the emergy analysis method to Huainan counties and showed the spatial characteristics of Huainan counties by using the technology of gis development.The conclusions are as follows:(1)The ecological economic system of Huainan is good as a whole,at the same time,the development of the social subsystem of Huainan is good in 15 years.(2)The emergy exchange ratio of Huainan is more than 1,the emergy yield ratio of Huainan is decreased and the emergy investment ratio is fluctuant in 15 years;Overall,the emergy money ratio of Huainan is changed from 2.6E+13sej/$ to 1.5E+13sej/$,which indicates that the economic subsystem of Huai Nan is good.(3)The environmental load ratio of Huai Nan increases from 4.6 to 24.2 in 15 years,the nonrenewable resource ratio increases from 75.7% to 91.7%,indicating that the environment subsystem of Huai Nan is under high pressure.(4)The changing trends of EREHI and MEG showes that in 2007 and 2008,the sustainable development of Huainan was not good because of the unreasonable utilization of resources and environmental pollution.(5)By applying emergy analysis to the counties of Huainan,the paper conculates that the conditions of the counties in Huai Nan in 2014 from high to low were: Pan Ji District,Tian Ja An District,Xie Ji Ji District,Feng Tai,Da Tong District,Ba Gong Shan District.(6)The paper obtains the soil erosion information of Huainan by using the softwares of ARCGIS10.2 and ENVI5.1,establishes the soil erosion database of Huai Nan and finds out that the soil erosion Huai Nan is relatively few.