Study On Land Ecological Security Evaluation Of Xi'an Based On Dpsir And Unbiased GM(1,1) Model

Land is the source of life,the production of the ecological base.The continuous progress of the industrialization process and the continuous growth of population and the irrational use of land by the human activities seriously threaten the land ecological security problems such as land ecosystem security,land pollution,soil erosion and lack of reserve land resources.At the same time,the "Eighteenth National Congress of the Communist Party of China" put forward to vigorously promote the construction of ecological civilization,emphasizing the "ecological civilization construction to integrate into the whole process of social construction,and strive to build beautiful China",with the construction of ecological civilization to the national strategic level,For the ecological civilization construction of important content of the land ecological security,the relevant research has become the focus of the current research.Xi'an is located in Guanzhong Basin,Shaanxi Province,north of Weishui,Nanping Qinling,is now the rapid development of large cities,facing the rapid expansion of the city,reserve resources,environmental pressure surge and so on.With the national "area along the way","Guanzhong Tianshui Economic Zone Development Plan" and other strategic implementation,Xi'an will be built as an international metropolis and international tourist city,urban expansion will continue,the land ecosystem is facing enormous pressure,land ecological security The problem is obvious.Based on the relevant research results at home and abroad and the analysis of land use status and land ecological environment in Xi'an,this paper constructs five criteria of "driving force,pressure,state,influence and response" by referring to "DPSIR" Layer,23 evaluation index of Xi'an land ecological security evaluation index system.The comprehensive weight method is used to determine the weight of the index,and the comprehensive index method is used to calculate the comprehensive value of land ecological security.In this paper,the comprehensive value of land ecological security is calculated by using the method of difference method to carry out the quantitative processing,the analytic hierarchy process and the entropy method.Land ecological security status of the comprehensive evaluation.On the basis of the evaluation results,the unbiased GM(1,1)model was used to forecast the development trend of land ecological security status in Xi'an from 2016 to 2020,and the obstacle degree model was used to determine the obstacle factors affecting the ecological security of land in Xi'an.Of the countermeasures.The results show that the land ecological security situation in Xi'an is improved from 2006 to 2015,and the system state has experienced unsafe to critical safety.In the three stages of safety,the index of land eco-safety is fluctuating upward trend.The ecological security of the land in the new urban area,Beilin area,Lianhu district,Yanhu district,Yanta area,Weiyang area,Gaoling area and Yanliang district is the critical safety,Baqiao District,Lintong District,Chang'an District,Zhouzhi County,Huxian County Lantian County is safer,suburban county land ecological security situation is better than the main city;"13th Five-Year" period of Xi'an land ecological security in a safer state,the degree of land ecological security will continue to improve,but the degree of improvement is not obvious,The main obstacle factors were population density(P1),unit fertility load(P3),unit land area pesticide load(P4)and reserve land resource rate(S4).