Agricultural Ecological Risk Assessment Of Dongting Lake Ecological Ecological Zone

As urbanization continues to advance,human activities continue to interfere with the stability of agricultural ecosystems,and the contradiction between economy,resources and environment becomes more and more prominent,causing the damage of farming ecosystems.For this reason,the No.1 document of the Central Government in 2021 once again focuses on agricultural development,emphasizing the fight to turn around the seed industry and promote the sustainable development of agriculture.The evaluation study of agricultural ecological risks can provide a decision basis for agricultural risk management,prevent and reduce ecological risks from the source of risks,and promote agricultural ecological security.In view of this,based on ecological economic theory,ecological agriculture theory and ecological carrying capacity theory,this paper takes Dongting Lake Ecological Economic Zone as an example,uses PSR model,selects 14 indicators from three aspects of pressure,state and response of agricultural ecological risk to build an evaluation system of agricultural ecological risk in line with real situation of Dongting Lake Ecological Economic Zone,and to quantify risk exposure uncertainty,uses the unconfirmed measure to Agro-ecological risk evaluation is carried out,the weight of indicators is determined by the entropy weighting method,and the results of agro-ecological risk evaluation for 2015-2020 in Yueyang,Changde and Yiyang cities are studied and analyzed,and suggestions for risk prevention mechanisms are put forward,with a view to providing some reference decision basis for the improvement of agro-ecological security.The following conclusions are drawn:(1)The assessment report shows that the agro-ecological risk of the Dongting Lake Ecological and Economic Zone is floating between grade II and grade III from 2015 to 2017,indicating a more insecure state,which to some extent indicates that the agricultural ecological environment of the ecological economic zone of Dongting Lake is still facing many ecological problems and there are many potential ecological risks,such as degradation of the service function of the agricultural ecosystem.The agro-ecological risk of the Dongting Lake Ecological and Economic Zone in 2018-2020 is floating between level Ⅲ and level Ⅳ,which indicates that the lake area is vigorously developing its economy while also focusing on the protection of agro-ecology and implementing agricultural film and pesticide reduction and efficiency,and has achieved certain results.(2)Among the indicators of agro-ecological risks affecting the Dongting Lake eco-economic zone in 2015-2020,agricultural film load per unit area is the main factor affecting the agro-ecological risk,followed by the top three factors causing significant impact on the agro-ecological environment,which are soil erosion control area,pesticide load per unit area,and afforestation area.Based on the analysis results,this paper proposes management countermeasures for the Dongting Lake Ecological and Economic Zone.The specific measures are:strengthening the prevention and control of agricultural film pollution,promoting soil erosion control,formulating multi-effect pesticide reduction,accelerating afforestation and strengthening agro-ecological security management.