Study On The Comprehensive Quality Evaluation Of Zhushan Cultivated Land And The Potential Of The Quality Improvement

As the carrier of production and life,cultivated land is the basis for human survival and development,and it is the guarantee for ensuring food safety and ecological security and maintaining sustainable development of society.As an important part of agricultural land,the quality of cultivated land is directly related to China’s food security.Therefore,how to comprehensively evaluate the quality of cultivated land and explore the intrinsic potential of cultivated land is of great significance.Taking Zhushan County,Shiyan City,Hubei Province as an example,this paper selects the evaluation index from the four aspects of natural quality,space quality,management quality and ecological quality of cultivated land to construct a comprehensive quality evaluation index system for cultivated land.The analysis of the field sampling data of Zhushan County,the Zhushan County Land Use Change Survey Database,the annual update evaluation database of cultivated land,and the evaluation database of cultivated land quality grades are used to evaluate the comprehensive quality of cultivated land in Zhushan County and analysis the quantity,quality and spatial distribution of cultivated land.On this basis,the restriction factor evaluation model is introduced to analyze the degree of restriction on the comprehensive quality of cultivated land by different evaluation index systems.Delineate the comprehensive quality of cultivated land to be upgraded and analyze the potential of comprehensive quality improvement of cultivated land for different constraints.Through the research of this paper,the following conclusions are drawn:1.The comprehensive quality grade of cultivated land in Zhushan County is between the 3 grade and 8 classes.The 3 grade area is 1101,81 hectares,accounting for 2.74%of the total cultivated land;and 15690.55 hectares for the 4 grade area,accounting for 39.02%of the total cultivated land;the maximum area of the total cultivated land is the 5 grade land,it is 17112.86 hectares,accounting for 42.56%of the total cultivated land;5513.85 hectares for the 6 grade land,accounting for 13.71%of the total cultivated land;771.70 hectares for the 7 grade land,accounting for 1.92%of the total cultivated land;and the minimum area of the total cultivated land is the 8 grade land,it is 20.90 hectares,accounting for only 0.05%of the total cultivated land,and the weighted average grade of cultivated land comprehensive quality is 4.73.2.By analyzing the constraints of cultivated land in each village,twenty-nine restrictive factors areas are divided,among which the organic matter content limiting faetor area is the maximum limiting factor that affecting the comprehensive quality limit type of cultivated land in the study area,47 administrative villages are affected,and the total impact area is 7,504.68 hectares,accounting for 18.66%of the total cultivated area in the study area.Irrigation conditions-total nitrogen content-available potassium content-organic matter content is the minimum area of the study area that affected the comprehensive quality of the cultivated land.This limiting factor affects only one village,Huajiawan Forest Farm,with an impact area of 3.50 hectares,accounting for only 0.01%of the total cultivated area.3.On the basis of delineating the comprehensive quality limit factors of cultivated land,and according to the promotion standard analyzing the improvement potential of the cultivated land.After the improvement potential the comprehensive quality grade of cultivated land in the whole district is 4.37,which is 0.36 higher than the actual grade of the comprehensive quality.The comprehensive quality improvement potential of cultivated land in each township is between 0.19 and 0.66,and there are six townships have a grade potential improvement.From the village scale,the comprehensive quality improvement potential of cultivated land is between 0 and 1.31,of which the number of administrative villages with a range of[0.2,0.3)is 47,and the administrative villages with a potential increase range more than 1 is only two,which are Jiangxi Village and Tieniu Farm.In summary,by analyzing the comprehensive quality limit factors of cultivated land,can help improve the quality of the cultivated land in the study area.