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Comparative study on determination methods of cultivated land quality evaluation unit based on GIS

Li Wei;Yang Jianbo;Wen Jinpan;Hou Ning;lnstitute of Geography,Henan Academy of Sciences;  
[Purpose] To lay a foundation for the rationality of the classification of cultivated land and the calculation of benchmark land price by studying the classification method of grading units.[Method] The cultivated land in Luoning County was taken as an example,and the firsthand data were obtained through the bureau's collection and field investigation. The GIS analysis technology was used to determine the evaluation unit by the plot method and the grid method,and the multi-factor comprehensive evaluation method was used to establish the grading factor system. The weighted sum of factors was used to obtain the grading index. Level area ratio analysis,level rating index analysis,level overlap analysis and level net income analysis are used to verify the rationality of the two methods.[Result] The research shows four results,to begin with,compared with the plot method,the median value of the grid legal index showed a left-leaning trend when the maximum and minimum values were consistent; In terms of variation coefficient,the block method is more stable than the grid method. Then,the spatial distribution of the two methods showed a trend of spreading from the center to the edge of the county; There are some differences in the area distribution between the two methods.furthermore,the level of area of overlapping degree analysis,the level of grid method above plot method area ratio was 82.65%,the instruction method according to the grid division level,evaluation unit high common level,performance on the don't overlap degrees at all levels,two methods to overlap degree at level 2,3 were similar,overlapping degree at level 1,4,the ground is large;fourthly,in terms of grading index and net income analysis,the correlation R value of plot method and grid method is 0.367 and 0.382 respectively, and the significance degree of plot method and grid method is 0.05 and 0.01 respectively. The two methods are correlated with the per mu net income of land.[Conclusion] The conclusion of this paper is that the overall trend of level division is the same between the plot method and the grid method,and the plot method is more stable and reasonable than the grid method. above all, two kinds of methods in the process of level division each have advantages and disadvantages,the results of research provide a basis for better division level of cultivated land, It can provide important reference value for improving cultivated land quality evaluation and promoting healthy development of urban-rural integration. The overall trend of level division is consistent between the plot method and the grid method,and the plot method is more stable than the grid method.
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