Evaluation Of Land Ecological Security In Jiangsu Province

Land ecological security is important for human survival and development,specifically reflected in the development of regional economy,people's living improvement,environmental optimization,rational use of land resources.Land ecological security assessment provides an effective method for scientific evaluation of the impact of human activities on land ecological environment.through this study,people can understand the specific conditions of their own land ecological environment,and form an intuitive and real feeling.Only the understanding of the problems of land ecological environment can stimulate the idea and motivation of protecting the environment,take protective measures,gradually alleviate the pressure of land ecological environment,maintain the sustainable development of land ecological environment,and provide scientific basis and technical support for land ecological planning and design.This paper takes 13 cities of Jiangsu province as research object,using the PSR model to establish the land ecological security evaluation index system,using entropy method to determine the weight of each index,evaluation and analysis of 13 cities in Jiangsu province,and the evaluation results time and space.The main findings and results of the study are as follows:(1)the construction of land ecological security index system.Using the PSR model to construct the evaluation system of 17 indicators,from three aspects of land ecological pressure,land ecological status and land ecological response.(2)with the matter element analysis,the dynamic change trend of land ecological security in Jiangsu province from 2010 to 2014 over time,the evaluation level gradually rises,the land ecological status is better and better,the evaluation broken line location year by year,broken line is flat,shows that the land ecological security situation in each city is improving.In 2013,Jiangsu province established the ecological civilization construction planning(2013?2020),by 2013 and 2014,the implementation effect is obvious,within a year and a half,two urban areas are upgraded to safety level,2 cities are upgraded to sensitive level.(3)from the spatial dimension,in 2010,the evaluation level of the unsafe total of 4 municipalities,respectively Xuzhou,Lianyungang,Suqian and Huai' an,from the geographical location,all belong to north of Jiangsu province;The evaluation grade is sensitive 6 cities,are Yancheng,Yangzhou,Nanjing,Zhenjiang,Taizhou and Nantong,from the graph can see,most belong to the central region of Jiangsu;The evaluation level for the more safe three cities,respectively Changzhou,Wuxi and Suzhou,belong to the southern region of Jiangsu province;The land ecological security situation in the north is larger than in the south.In 2011,only the Suqian evaluation level was unsafe level,the remaining three cities rose to sensitive level,Nanjing,Zhenjiang and Nantong increased from sensitive level to safer level,the evaluation level of qiyushi remained unchanged,and the spatial disparity was greater.The evaluation of land ecological security in 2012 compared with 2011 did not change significantly,from two maps can see the change is only Suqian,the security level increased to sensitive level,the rest did not change,the province land ecological security ranking is two evaluation levels,upper half is sensitive grade,lower half is the safer level.In 2013,the original central north central evaluation grade for the sensitive grade no change,Wuxi and Suzhou two cities rose to safety level.In 2014,the urban area of the safety level reached 4,the new Nanjing and Changzhou,the safer level of urban areas reached 4,respectively Huai' an,Yancheng,Nantong and Zhenjiang,Huai' an,and Taizhou,except Yangzhou and Taizhou,are safer and above level.Spatial autocorrelation analysis shows that,from the global correlation analysis,there is a certain spatial aggregation phenomenon of land ecological security status,Grade A few has significant positive correlation,the index is decreasing in five years,and the spatial autocorrelation of land ecological security in Jiangsu province is gradually weakening.From the local correlation analysis,the improvement of regional land ecological security has spatial differences,and the local spatial correlation is becoming weaker and weaker.