Theoretical And Empirical Study On County Cultivated Land Health Evaluation

As the most basic agricultural production material,cultivated land is one of the most valuable natural resources in the world.The health of cultivated land is the foundation for the development of sustainable agriculture and plays an important role in maintaining the sustainable productivity,animal and plant and human food chain safety and health.However,in recent years,cultivated land resources are facing health problems such as degraded quality,unreasonable utilization and serious pollution.Therefore,it is particularly urgent to carry out research on cultivated land health assessment.On the basis of systematically summarizing relevant research results,taking Wen County of Henan Province as an example,the main conclusions are as follows:(1)Defining“cultivated land health”is the ability of the cultivated land system to maintain the symbiotic,mutual and regenerative relationship between cultivated land,people,organisms and the environment.That is,cultivated land has the ability to maintain crop production,ensure self-purification,and maintain the ecological environment clean and healthy.The ability of animals,plants and human health.In addition,the DPSIR model is used to analyze the mechanism of the healthy operation of the cultivated land system.For the cultivated land system,the driving force is the driving force to promote or hinder the healthy development of the cultivated land system;the pressure is the load generated by human activities;the state is the cultivated land system under the pressure load.The state of the situation;the impact is the benefits and value of the cultivated land system to the resource environment and social and economic development;the response is the countermeasure adopted by humans to promote the healthy development of the cultivated land system.(2)According to the ecosystem health assessment,eight criteria for the determination of cultivated land health were established.Based on the characteristics of the healthy operation of the cultivated land system,the structure was constructe based on“structure—function—process—service—quality—health”and“vigor—resilience—contribution”theoretical framework of arable land health(static)and arable land health trend(dynamic)evaluation index system.(3)It is proposed to use the correction coefficient method,the strongest limiting factor method,the weighted summation method and the comprehensive algorithm to calculate the cultivated land productivity quality,environmental quality,health quality and ecological quality index respectively,and then superimpose the cultivated land health degree(static)of the four dimensions.The evaluation method also proposes a comprehensive trend method for the evaluation of cultivated land health trends(dynamics).(4)The results of evaluation of cultivated land health degree:Wenxian County's arable land health and other distributions have obvious geographical differentiation characteristics in 2017.The Qingfengling is bounded by the Qingfengling.The cultivated land in the north is healthier than the south,and the sub-health in the county is the most healthy,with an area of 14867.19hm~2.The total area of cultivated land is 47.31%.Cultivated land health trend evaluation results:In2017,the township health index was the lowest,with an average of 0.4866,while the2012 and 2007 averages were 0.5731 and 0.5669,respectively.The number of agricultural employees in the towns of Wude Township,Zhaobao Township and Beileng Township decreased from 2007 to 2017.Although the agricultural infrastructure was well established,the amount of agricultural fertilizers and pesticides applied was large,and the film coverage rate was high.Increasing factors and other factors are extremely serious threats to the health of cultivated land.