Land Ecological Security Evaluation In Bohai Rim Region

In May 2018,General Secretary Xi Jinping stressed at the National Conference on Ecological Environmental Protection that ecological civilization construction is a fundamental plan for the Chinese nation's sustainable development and an important strategic task for building a socialist modernization power.Land ecosystem is an important part of the entire ecosystem and an important carrier for other ecosystems.If the land ecosystem is insecure,it will affect the sustainable and healthy development of the whole society.Land is the space for human survival and development,and the most bisic natural resource for social and economic development.However,in order to seek rapid economic development,human beings have fundamentally changed the way they use land,and their intensity of use and degree of damage have sharply deepened.The deteriorating land ecosystem has hindered the sustainable development of the social economy.Under this background,it is of great practical significance to objectively evaluate and recognize the safety level of regional land ecosystems.Based on some relevant theories,this paper selects 17 coastal cities in the Bohai Rim region as research areas.Using the DPSIR model,and a total of 18 indicators are selected from five aspects of land ecological driving force,pressure,state,impact and land ecological response to meet the characteristics of the Bohai Sea region.The results of land ecological security evaluation are analyzed from two angles.According to the study,during the period of2004-2016,the comprehensive ecological security values of the cities around the Bohai Sea were between 0.3 and 0.7,and the overall status of regional land ecological security continued to improve,but the ecological security status of some cities was unstable.The ecological security level of Tianjin,Qingdao and Weihai are at a high level in the Bohai Rim region,while Huludao and Yingkou City are in a backward position.GM(1,1)grey prediction model is used to predict the ecological security status of the study area in 2020.It finds that the overall land ecological security status of the region continues to improve,but there are stii a few cities' land ecology status are not optimistic.The ecological security status of the land around the Bohai Sea area has been improved after the relevant measures,but it has not yet reached a good land ecological security state,which is still not conducive to the sustainable use of land.This paper proposes corresponding management measures from the perspectivesof strictly controlling land pollution and strengthen soil remediation;strengthening regional water resources management;optimizing land use structure and promoting industrial structure transformation and other aspects of the corresponding management measures.However,because some data are difficult to obtain,the indicators selected in this paper mostly focus on social and economic aspects,and the indicators of natural ecology are less.Moreover,the evaluation methods used are more traditional,and more innovative methods should be applied to further study the level of land ecological security in the Bohai Rim region in the future.