Study On The Evolution And Evaluation Of Cultivated Land Ecological Security In Poyang Lake Eco-economic Zone

Cultivated land ecological security is an important part of national security.Safeguarding the ecological security of cultivated land is the precondition for realizing the sustainable development of social economy and the basis for maintaining the long-term stability of the country.Accompanying with the development of urbanization and industrialization,the cultivated land resource less and less,to external demand pressures on arable land is bigger and bigger,and the unscientific and unreasonable farming is multiple factors such as material input had a great disturbance to the cultivated land ecological security.It is of great significance to grasp the evolution form of cultivated land ecological security and to find out the foundation of cultivated land ecological security for the sustainable use of cultivated land.At first,this paper analyzes the essential feature of the cultivated land,combining the development history of cultivated land and the existing problems,this paper external cause evolution under the action of land ecological security,and then on this basis,using the entropy method and the variation coefficient method from the damage cause of loss factor of the cultivated land ecological security screening indicators and determine the comprehensive weight,through the construction of multidimensional space state model,each index is calculated under different factors combination of arable land ecological security index reality and the ideal index vector modulus ratio,calculated the Poyang lake eco-economic zone various counties(city)Regional)cultivated land ecological security index,which divides cultivated land ecological security into five grades according to the principle of equidistance division,obtains the cultivated land ecological security status of each region of Poyang lake eco-economic zone.The research results show that:(1)The cultivated land ecological security status is the internal cause(soil environment,atmospheric environment,water environment,climate,environment,ecological environment)and external(agricultural pollution,industrial pollution and population development,economic development and cultivation condition)changes under the action of dynamic balance.Poyang lake eco-economic zone of cultivated land ecological security status,the external factors of cultivated land ecological security and stability of state security and disturbance effects were obviously,the evolution of the cultivated land ecological security situation is affected by external effect is significant.External cause is an important driving force for the ecological security change of Poyang lake eco-economic zone.(2)In terms of time,the ecological security of cultivated land in 28 counties(cities and districts)in the whole region in 2000 was in a safe level,and the remaining two counties(cities and districts)were in a critical state of safety.In 2005,the ecological security of cultivated land in 15 counties(cities and districts)was at a safe level,with the remaining 16 counties(cities and districts)as the critical safety state.In 2010,the cultivated land ecological security of 29 counties(cities and districts)in the whole region was at a safe level,and 2 counties(cities and districts)were the critical safety state.2015 2 a county(city,area)domain of the cultivated land ecological security in safe level,28 counties(city,area)the cultivated land ecological security in a relatively safe level,a county(city,area)is a critical safety status.The overall cultivated land ecological security state of the research area in 2000--2015 is safer--critical safety--more safe--a more secure "V" font change trend.(3)From the perspective of space,Nanchang city district,Xinjian county,Anyi county,Jinxian county,Ruichang county,Wuning county,Dean county,Duchang county,Penzer county,Yujiang county,Wannian county,Yugan county,Poyang county and fengcheng city 14 counties(city,area)of the cultivated land ecological security status is relatively stable,along with the change of time series the cultivated land ecological security in a safer level all the time,did not change significantly.Leping,Fuliang county,Jiujiang city district,Jiujiang county,Yongxiu county,Xingzi county,Yingtan city district,Guixi county,Xingan county,Zhangshu city,Fuzhou city district,Dongxiang county,Gaoan city 13 counties(city,area)the cultivated land ecological security status in "V" type change.The cultivated land ecological security in Nanchang county,Xinyu city district and Jingdezhen city district has realized the change from the critical safety to the safe state.The ecological security of cultivated land in Hukou county is changed by "W" type.