Research On The Gradation Change Of Cultivated Land For County Land

Quality of cultivated land is related to the overall situation of China's food.But the problerm that government focus on management of cultivated land quantity, ignoring the management of cultivated land quality has become increasingly prominent. How to scientifictly make the research on cultivated land quality gradation change has been a urgent need.In the land management of our government.This paper give the Hailun country Heilongjiang province for example,from three incentive that caused the farmland gradation change,analyzed the the HaiLun city farmland gradation and the change value and space distribution of the capacity change,studied the change before and after the land consolidation area tidied separately. The research provides decision-making basis for rational planning,management of farmland and strengthen farmland protection, to achieve intensive and efficiently utilization of land resources, to ensure the sustainable development of land resource,to achieve the management of land quantity converted to both quality and quantity of land management.The results of the study show that,from 2000 to 2020 the new construction occupied 2928.09 hectares of cultivated land,caused farmland theory productivity reduce 3.44 tons,realized the capacity reduce 2.88 million tons,the actual capacity reduced 1.03 million tons,the new farmland of HaiLun city land development is 895.15 hectares,replenished 98 pieces of land plot totally,the natural quality gradation judgement is 7-10,useful gradation is 6-8,economic gradation is 5-8.The quality gradation promoted 1-2,useful and economic promoted 1-3,cultivated land level promoted 1-5 levels after finishing farmland. In the all county,the area of natural quality gradation judgement of 9 has increased 5118.91 hectares, the area of gradation judgement of 6,7 and 8 all have decreased; The area of useful gradation of 7,8 and 9 have increased 3002.47 hectares,3882.42 hectares and 210.79 hectares,the area of gradation judgement of 5,6 have decreased 1964.24 hectares and 6297.67 hectares;The area of economic gradation of 5 and 9 have decreased 9511.21 hectares and 1.21 hectares, the area of gradation judgement of 6,7 and 8 have increased 74.54 hectares,608.52 hectares and 663.15 hectares.After chang, the farmland theory productivity of all county is 3202468.05 tons, realized the capacity of all county is 3889148.31 tons. the farmland theory productivity increased 7712.50 tons,the realized the capacity has increased 9889.45 tons.According to this study, there are four conclusions as following:First, the change value and change trend of County cultivated land, the macro-cognition of the change of cultivated land quality and the preliminary judgment of the change trend of cultivated land quality can be obtained from the study in below three aspects: the determination of the cultivated land grade before and after it is organized in the land arrangement area; the determination of the newly created farmlands grade during land development; the impact on farmlands production capacity by newly increased construction activities.Secondly, the upgrading of the farmlands quality in Hailun City is mainly affected by upgrading of the Index of Light and Temperature Production Potential ( ), there is no significant value change of other grading factors before and after they are organized, in return there is no obvious influence on farmlands quality grade.Third, to get more updated information of the change of farmlands quality, research and analysis should be undertaken upon farmlands grade transformation.