Study On Land Use/cover Change And Eco-environmental Effects Of Jianyang City

Located in the hilly area of sichuan basin， Jianyang city has had a rapideconomic development since Western Development was implemented. Meanwhile theregional urbanization process has accelerated， and urban expansion has increased thedemand of land use. It has become the primary problem of urban development inJianyang that how to combine the development of social economy and the sustainabledevelopment of land resources. The paper found out driving factors of land usechange and discussed the characteristics and driving mechanism of it by analyzing theeffect of regional economy on LUCC. The paper also analyzed the environmentaleffects of land use change and it could provide theoretical basis for sustainabledevelopment of land use in Jianyang. This study obtained land use data andgeographical environment data by RS and GIS techniques， and analyzed the spatialdistribution characteristics and eco-environmental effects of regional land use/coverby using the knowledge of geography， landscape ecology， statistics， etc. Theresearch results are as follows:(1) The paper collected the RS data of2005and2009of Jianyang， establishedthe RS interpretation marks of land use， and acquired the land-use maps of2005and2009by visual interpretation. The maps of2005and2009were used as the initial yeardata and precision inspection data of simulation respectively. This paper predicted theland use demand from2006~2020by using data of land use change from1997~2005and the GM(1，1) model.(2)It analyzed the characteristics of LUCC in Jianyang in recent years andselected out11driving factors， which are elevation， slope， aspect， distance torivers， distance from cities， distance from towns， distance from highways，density of population， GDP per capita， net income of farmers， urbanization rate.SPSS was used to make a quantitative analysis of the relevance of driving factors anddifferent kinds of land use， and ROC was applied to inspect the correlation betweenthem. The inspection results of farmland， garden plot， forest land， constructionland and water were are0.716，0.813，0.763，0.703and0.846respectively，whichshowed a good correlation of them.(3)It made a dynamic simulation of land-use maps from2005~2020of Jianyang by using CLUE-S model， and inspected the simulated data of2009with itsinterpreted land-use map. Kappa coefficient was applied to make a quantitativeinspection of its precision. The Kappa index was0.89525， which showed that theparameters of the simulation were appropriate and it can simulate the types of landuse change in Jianyang better.(4) The basic theories of landscape ecology were applied to analyze thedifferentiation characteristics of land use/cover of2005and2020. The paper selected5landscape indexes to describe the structure characteristics of different patch types，which included patch numbers，patch density，landscape scale，etc. It also selectedShannon’s diversity index and Shannon’s evenness index to describe the generallandscape features of the study area. Fragstats3.3was applied to calculate the index oflandscape ecology and analyze the eco-environmental effect of LUCC.