Land Ecological Security Analysis of Guanzhong-Tianshui Economic Zone Based on PSR Model

By discussing the land ecological security status in Guanzhong-Tianshui Economic Zone, it can provide decision-making reference for the coordination and sustainable development of land resources in the economic zone. The entropy evaluation method, PSR model and construction index system were used to evaluate the land ecological security in the economic zone. The results of this study are as follows:(1) From 2007 to 2015, the pressure of the natural environment of the economic zone caused by human growth is rising,but the current security status quo faced by living environment and land resources is stabilized; economic zones to solve the economic zone ecosystem problems faced by the intensity through various means is not enough, positive human activities contribute less to the maintenance of land ecological security. (2) Pressure, state and response value will be natural resources which link the social, economic effectively together to determine the size of the integrated value. During the study period, the comprehensive value of land ecological security in the economic zone is between 0.468 and 0.612, and the overall safety at the critical level is that the ecological system can maintain the basic function and the ecological disaster occurs. (3) In 2007, the city with low land ecological security level is Tianshui City, Xi'an, Xianyang and Baoji are in 2015. The distribution of land ecological security grade is gradually decreasing from sub-core city to central city. In order to promote the coordinated and sustainable development of the economic zone, such as treatment of water environment, efficient and intensive land use, urbanization level, environmental protection and vegetation coverage rate and so on in the future should be focused.