Land Ecological Security Assessment Of Yangxian County Based On Land Use Change

Land,as the space and material basis for the survival and development of human society,is a natural and economic complex of soil,rock,topography,hydrology,atmosphere and vegetation in a certain height and depth of the earth’s land,which integrates the achievements of human activities.Mankind obtains material wealth to meet the needs and development by changing the way of land use.In this process,the scope of human activities expands and the intensity of utilization increases,urbanization and industrialization level advances,resulting in the increasingly prominent contradiction between man and land.The change of land use pattern will change the land cover,and the change of the elements of land ecosystem will inevitably affect the land ecological security.As we all know,regional sustainable development is based on land ecological security,and land use change affects the status of land ecological security.Therefore,analysis of land use change and assessment of ecological security level are conducive to regional development,and can provide a basis for sustainable use of land resources and scientific and rational planning.The results are as follows:(1)Land use changeDuring the research period,the area of cultivated land,garden land and forest land in Yangxian County decreased as a whole,the area of transportation land,water area and water conservancy facilities land increased,and the urban villages and industrial and mining land increased the most;except for the proportion of forest land,urban villages and industrial and mining land changed,the proportion of other land types did not change significantly,and the change of land use structure tended to be stable.The comprehensive degree index of land use is in the middle level,and the utilization degree can be improved.The change of land use degree is the largest in 2008-2011,which indicates that the change of land use is the most intense in this period.The change rate of land use degree in the three stages is greater than 0,which indicates that the land use degree is deepening and is in the development stage.(2)Assessment of land ecological securityThe comprehensive ecological safety values of land in Yangxian County in 2008,2011,2014 and 2017 are 0.6775,0.6990,0.7207 and 0.7521,respectively,indicating that the ecological safety of land in Yangxian County is gradually improving,and the safety values are between 0.6 and 0.8,indicating that the ecological function of Yangxian County is damaged to a certain extent,and its self-recovery ability is relatively poor,accompanied by ecological and geological disasters.In order to solve the current land ecological security problems faced by Yangxian County and realize the sustainable development of land,the government and relevant departments should take measures from social and economic aspects to improve the level of land ecological security in Yangxian County.