Study On Cultivated Land Quality Monitoring In Shixing County Based On Classification Calculation Model

The quantity and quality of cultivated land are related to China’s food security and long-term social stability.The decrease of cultivated land area is intuitive,while the decrease of cultivated land quality is hidden,which can only be found based on the corresponding monitoring technology.This paper took Shixing County in the northern part of Guangdong Province as the research object,combined the design ideas,strategies and farmland quality monitoring results of various regional monitoring index systems,and used GIS technology,capacity accounting,grading accounting models and other methods to study the quality of farmland in Shixing County.The influence of various factors on cultivated land quality and productivity was analyzed,and the cultivated land quality monitoring index system of Shixing County was formed.The details are as follows:(1)Explained the construction principles and methods of the mathematical model of agricultural land productivity accounting,constructed the Shixing county farmland theoretical productivity calculation model and the achievable productivity calculation model,and obtained the average theoretical yield and average yield of the gradual farmland in the towns under Shixing County.The unit yield can be achieved,the change of farmland production capacity is analyzed,the intensity and potential of agricultural land use in the county are discussed,and the area of land use coefficient and economic coefficient of paddy field and dry land in Shixing County in 2018 is divided.(2)According to the methods and steps of arable land quality monitoring zoning,Shixing County was divided into 7 arable land quality monitoring and evaluation monitoring areas,and 46 monitoring units(including 39 paddy field types,4 dry land types,and 3 available land types)were selected.Adjust the type of land).Divide the natural quality of cultivated land in Shixing County into 4-9 grades,of which 4,5,6and 7 have a larger proportion;divide the national utilization into 2-8 grades,and 5and 6 grades cover more extensive areas;The economic level of arable land is divided into 1 to 8,and there are more distributed monitoring units such as 5,6,and 7.(3)The grading parameters of arable land quality in Shixing County were studied,the index system of arable land quality grading factors was established and the weight of each factor was determined,and the optional arable land quality monitoring index system and evaluation model in Shixing County were proposed.A key survey and monitoring of soil p H,organic matter content,topsoil texture,irrigation guarantee rate,and drainage conditions were carried out,and the changes in factors such as the dominant grading of cultivated land and their reasons were analyzed.Through the analysis of the characteristics of the grading changes of cultivated land in the past three years,there are 20 monitoring units in the fertility improvement type and 26 monitoring units in the acidification type.There are 15 figures,27 tables,and 74 references in this paper.