Evaluation Of Cultivated Land Grade Renewal Based On GIS

In order to protect cultivated land effectively and develop cultivated land rationally,evaluating cultivated land in different grades is an important work.Farmland grade refers to the quality of cultivated land.The cultivated land quality is divided into 1 to 15 from the best to the worst,which is comprehensively assessed by the land department according to the standard farming system and specific processes and methods.Jinxiang County is a large agricultural county,but there is no superior cultivated land.It mainly focuses on agricultural production.Under the background of the continuous reduction of cultivated land area,improving the quality of cultivated land is an effective solution.It is more conducive to put forward targeted suggestions to evaluate the quality of cultivated land in Jinxiang County.The main contents of this paper are as follows:(1)According to the current situation of land use analysis.Through the study of the characteristics of land use in Jinxiang County,it is found that agricultural land accounts for 78.33%,of which only cultivated land accounts for 85.23%.The vast majority of the land is cultivated land.It is concluded that there are some problems in land use,such as shortage of reserved cultivated land resources,decline of cultivated land quality,illegal occupation of cultivated land,prominent contradiction between land planning an d land use.(2)According to the situation of cultivated land over the years,the change trend is analyzed.Through comparative analysis of the status quo and quality of cultivated land in Jinxiang County over the years,it is found that the total amount of cultivated land has continued to decrease in recent 10 years,and the quality of cultivated land is on a slow upward trend,and the yield and economic benefits of cultivated land may fluctuate under the influence of uncontrollable factors such as meteorology.(3)The cultivated land grade is renewed.Based on the theoretical basis and data basis of cultivated land classification,as well as specifi c calculation method,namely,the natural quality score,land utilization coefficient and land economic coefficient are obtained according to the grading parameters,so as to calculate the natural grade,utilization,etc.of cultivated land,and the cultivated land classification database in 2015 is updated to 2019,and the cultivated land classification results in 2019 are obtained.(4)Cultivated land quality evaluation.In this paper,the land use status data of Jinxiang County in 2015 and 2019,the cultivated land classification results in 2015 and 2019,and the administrative region data of Jinxiang County were used for evaluation and analysis.The results show that:Jinxiang County is dominated by high-level land in terms of national natural resources,high-level land for national use,high-level and medium-sized national economy;the decrease and increase of cultivated land grade is consistent with the trend of cultivated land classification analysis in Jinxiang County over the years;with the construction of high-standard farmland,the quality of cultivated land in northern Jinxiang County is steadily improving In recent two years,the quality of cultivated land in southern China has been improved by a large margin.