Study On The Quality Grade Evaluation Of Cultivated Land In Guichi District Based On GIS

Cultivated land is the essence of land.The quality of cultivated land is related to national food security,agricultural product quality safety and agricultural sustainable development.The construction and management of cultivated land quality is an important part of implementing the cultivated land protection system.Carrying out the evaluation study on the quality grade of cultivated land in Guichi District is conducive to grasping the specific distribution of the quantity and quality of cultivated land in the region,finding out the quality of cultivated land,and providing an important basis for formulating compensation standards for cultivated land in Guichi District.The paper takes Guichi District as the research area and cultivated land(paddy field,irrigated land,upland field)as the research object.It collects basic data such as administrative division maps,soil maps,and land use status maps of Guichi District.Record table data.Based on Arc GIS and cultivated land resource management information system platform,using Delphi method,analytic hierarchy process,fuzzy comprehensive evaluation method and other methods,a spatial database is established to form an evaluation unit,and the evaluation unit is assigned a value,and a cultivated land resource management information system is established based on The comprehensive index method is used to define the quality grade of cultivated land,complete the evaluation study of cultivated land quality grade in Guichi District,put forward countermeasures for the protection and improvement of cultivated land quality,and provide scientific basis for the adjustment of planting structure in Guichi District and the formulation of compensation standards for cultivated land in Guichi District.Research indicates:(1)The total area of cultivated land in Guichi District is 39200 hectares,of which the first-class area is 2978.81 hectares,accounting for 7.60%of the total cultivated area;the second-class area is 2165.97 hectares,accounting for 5.53%of the entire cultivated area;the third-class area is 4282.29 hectares,It accounts for 10.92%of the cultivated land area of the district;the area of the fourth-grade land is 5835.08 hectares,accounting for 14.89%of the cultivated land area;the area of the fifth-grade land is 6952.17 hectares,accounting for 17.74%of the cultivated land area;the area of the sixth-grade land is 8336.00 hectares,accounting for the whole area 21.27%of the cultivated land area of the district;the area of the fifth grade land is 5158.77 hectares,accounting for 13.16%of the cultivated land area of the district;the area of the eighth grade land is 2572.90 hectares,accounting for 6.56%of the cultivated land area of the district;the area of the nine grade land is 739.97 hectares,accounting for the cultivated land of the district 1.89%of the area;the area of the tenth grade is 180.04 hectares,accounting for 0.46%of the cultivated land area of the district.The average cultivated land quality grade of Guichi District is 4.93 grades.Among the 10 grades of cultivated land in the district,the larger area is mainly concentrated in grades 3-7,accounting for 77.97%of the cultivated area in the district,among which 5,6 etc.17.74%and 21.27%respectively,followed by 3,4,7 etc.,accounting for 10.92%,14.89%,13.16%,1,2 etc.accounted for 7.60%,5.53%,10 etc.accounted for 0.46%respectively.(2)Adopt "N+X" index system,"N" is 13 basic indexes,and "X" is a regional supplementary index.The evaluation of cultivated land quality grade in Guichi District is based on the selection of topography,effective soil thickness,organic matter content,cultivated layer texture,soil bulk density,texture configuration(soil texture profile),effective 15 evaluation indicators of phosphorus,available potassium,pH,biodiversity,barriers,irrigation capacity,drainage capacity,cleanliness,and degree of farmland forestry network,specifically analyzed the data of these 15 evaluation indicators for the evaluation of the quality grade of cultivated land in Guichi District To understand the quality of cultivated land in Guichi District.(3)Cultivated land quality grade evaluation in Guichi District The average cultivated land quality grade is 4.93,etc.According to the cultivated land quality evaluation results and main characters,the 10 grades of cultivated land quality in Guichi District are roughly divided into three categories,namely high quality type,medium quality type,and low quality type Among them,the high-quality type is high-yield field(1-3 grade arable land),with an area of 9425.08 hectares,accounting for 24.04%of the cultivated land area in Guichi District;the medium-quality type is middle-yield field(4-6 grade arable land)is 21123.24 hectares,It accounts for 53.89%of the total area of cultivated land in Guichi District,with a wide distribution range;the area of low-quality types,ie low-yield fields(7-10 grade cultivated land),is 8651.68 hectares,accounting for 22.07%of the total cultivated land area.