Study On Land Ecological Security Evaluation In Zhuanglang County

The research of land ecological security has become an important leading edgetopic among current researches. The paper analyses the land utilization condition andsituation of the ecological environment. According to affects of the different pressureindex trend to land ecological security, based on the "pressure-state-response"(PSR)conceptual framework model, assesses the land ecological security of Zhuanglang bycomprehensive index method. The main results were as follows:(1) Land use change in zhuanglang county. In terms of land-use structure, thecultivated land and forest land are still the main land class, respectively, accounted for44.5%and23.95%of the total land area. The cultivated land is reduced largest areas,and woodland show an increasing trend. The forest land and water land which havestrong ecosystem services are successively reduced. The number of land-use, forwhole land the rate of change is slower, the amplitude is lesser, and the trend is stable.Waters and water conservancy facilities reduce the fastest, follow by cultivated land;woodland increase the fastest, follow by garden land. The pattern of land use change,land-use richness enhanced and land use structure stabilized, land ecosystem servicefunction gradually increased as well.(2) Comprehensive evaluation of land ecological security of zhuanglang county.On the time change, land ecological secure value cannot be changed by the pressureindex safety trend under a decline. The main factors of deciding the ecological safetyare land ecological security status and response from the land ecological safetypressure. The affects of ecological security tends of pressure index to landeco-security are showed after2006, when all the pressure indexes are positiveinteraction, ecological security level show ascendant trend (scheme4), opposite, whenall the pressure indexes are negative effect, ecological security situation continue todecline (scheme3). After2006, pressure indicators factor show an increasing trend.When urbanization and economic density are the positive effects, the level of the landecological security show an increasing trend, and indicate that the level of the landecological security can be improved in certain social economy. In words，Zhuanglang, the levels of land ecological security whole are low, in a poor state.(3) There is closed relationship between Land use change and land ecologicalsecurity. The cultivated land, grassland and construction land are the main factors ofinfluencing land ecological security, and some pressure to land ecological security canbe brought with the reduction of cultivated land and grassland or the increase ofconstruction land. The growth of land use diversity could ensure the steadydevelopment of the land ecological security to a certain extent. The types, which areclosely related to land ecological security, are used rationally and control within thescope of a certain proportion of security, could promote the improvement of theecological environment, maintain the ecological balance, and achieve the sustainabledevelopment of economic and ecological harmony better.