Ecological Security Assessments Of Farmlands Poyang Lake Area Based Onemergy Analysis

With the development of urbanization in China and the gradual advancement of non-agricultural construction of cultivated land in recent years,the amount of cultivated in China is continuously decreasing.However,in the process of industrialization,large amounts of pesticides,fertilizers,and other inputs have caused continuous decline in the quality of arable land.Therefore,strengthening the protection of arable land can not only safeguard China's national security and food security,alleviate the outstanding problems of people-land conflict,but also better realize the sustainable use of arable land resources.Based on the study of the ecological security of cultivated land at home and abroad in this paper,it combines the theory of energy analysis with the traditional ecological security index system of cultivated land.Taking 13 counties(cities,districts)in the Poyang Lake area as the research object,some energy indicators and traditional indicators were selected to establish a ecological security evaluation system.Use the analytic hierarchy process to determine the index weights,and then standardize the indicators,calculate the comprehensive safety value that it obtains the arable land security status in the study from 2006 to 2015 and the ecological security of cultivated land in the counties of 13 Counties(Cities and Districts)in 2015.The specific results are as follows:(1)the ecological security of cultivated land in the study area changed greatly,and the overall trend was tortuous increasing from 2006 to 2015.The comprehensive safety value has increased from 0.3797 in 2006 to 0.3797 in 2015 as well as the safety category from "critical safety"(II)to "safety"(IV).This is mainly due to people's increasing awareness of arable land protection,continuous improvement of rural transportation and water conservancy,continuous improvement of rural conditions and people's continuous progress in arable land operations and conservation.In recent years,the development of characteristic agriculture and sightseeing agriculture is also an important condition affecting ecological security.(2)the ecological gsecurity of cultivated land in Poyang lake was mainly divided into two levels,which are relatively safe(III)and safety(IV).The comprehensive security value of the former is between 0.4 and 0.6,and the one of the later is between 0.6 and 0.8.there are 7 counties(cities,districts)at the security level,ranked from highest to lowest:Yugan County,Jiujiang County,Poyang County,Yongxiu County,Jinxian County,Nanchang County,Gongqing City.The comprehensive safety values of the one counties is above 0.7,it is Yugan County,making it the safest administrative region for cultivated land ecosystems in the entire study area.at the relatively safe level,ranked from highest to lowest:Hukou County,XianjianCounty,De,an County,Duchang County,Jiujiang citiy,Xingzi County.However the value of Xingzi County 0.4196,which is the lowest security area in the region.(3)Through the analysis of the research results,it was found that the main factors affecting the ecological security of cultivated land are the population density,the input value of unit industrial auxiliary energy,and the irrigation guarantee rate.The continuous increase of the population and excessive input of industrial auxiliary energy will increase the pressure on the environmental load of cultivated land and soil pollution.