Study On Land Ecological Security Of Lanzhou City Based On DPSIR Model

It is the cornerstone of human existence and development that the land bears all the material and resources and provides mankind with the necessary means of production and activity.Whether the land ecosystem is healthy or not affects the direction of human livelihood activities and the realization of the sustainable development goals.At present,the ecological security of land has become one of the main research directions of ecological security in all countries and is the driving force and follow-up guarantee of economic development and social progress.On the basis of summarizing the related researches of land ecological security both at home and abroad,this paper takes Lanzhou City of Gansu Province as an example,starts from the natural,economic,social and ecological environment of Lanzhou City,establishes the index system of land ecological security assessment in Lanzhou by using DPSIR model,Qualitative description and quantitative analysis of land ecological security in Lanzhou in2006-2015 to evaluate the status of land and ecological protection in Lanzhou City to make recommendations to promote the standardization and intensive use of land in Lanzhou City and effectively improve the land in Lanzhou City Ecological environment,and provide a guarantee for building an overall well-to-do society.The main conclusions are as follows:(1)According to the weights of 18 indicators constructed by Lanzhou ecological security evaluation system,the weight of per capita grain yield is the largest,with a weight of 0.1174.The weight of cultivated land area is the smallest with a weight of 0.0214.Among them,in the driving force layer,the weight of arable land per capita is the largest,which is 0.0847.In the pressure layer,the urbanization rate has the largest weight of 0.0403.In the state layer,the per capita weight of food production is the largest,0.1174.In the affected layer,the sewage treatment rate has the largest weight of 0.0519.In the response layer,GDP per capita has the largest weight of 0.1016.(2)From the aspects of pressure,driving force,status,impact and response index,the state index and response index increased sharply from 0.3751 and 0.3307 respectively in 2006-2015 to 0.8145 and0.8163 in 2015.The driving force The index fluctuated from 0.2500 in 2006 to 0.3099 in 2015.The stress index and impact index increased steadily from 0.0857 to 0.0659 in 2006 to 0.1086 and 0.0974 in2015 respectively.(3)According to the evaluation results of DPSIR model,the comprehensive index of ecological security of land increased from 0.2603 to 0.6748 from 2006 to 2015.The ecological security characterization of land from bad to good,the overall ecological security of land is safer.(4)According to the research of land ecological security evaluation in Lanzhou City from 2006 to2015,the measures to enhance the ecological security of land are put forward: 1)The implementation of benefiting agriculture policy is vigorously promoted.2)Strengthen the landscaping and pollution control.3)Strengthen education and improve the quality of citizens.4)Promote the project of returning farmland to forest and grassland.5)Green building in the open roof of newly built area.