耕地资源质量分类及等别转换方法研究——以广西北海市为例

Cultivated Land Resource Quality Classification and Grade Conversion Method——Take Beihai in Guangxi as an Example

【目的】本研究根据第三次全国国土调查“耕地资源质量分类工作方案”,以广西北海市工作成果为例,开展了耕地资源质量分类及等别转换方法的探讨,旨在通过转换成等别为耕地占补平衡与进出平衡等实践应用提供参考。【方法】通过外业实地核查更新基础数据及解译第二次土壤普查相关资料,采用适合当地调整后的评价参数体系更新耕地质量等别成果,按照技术要求开展北海市耕地资源质量分类研究,统计得到类别成果。选取了三套等别转换方法,在北海市银海区开展实证研究,对转换方法的合理性进行探讨。【结果】赋分加和法转换结果合理,能够更好体现耕地资源质量差异及分布状况,但不可进行全国对比。排列组合划分法产生的等别结果分布不合理,成果易受低等级指标影响;级别分加和法转换结果较为合理,便于实现耕地质量的全国可比但转换结果等别跨度较低,差异性不强。【结论】级别分加和法转换法可以满足耕地质量的全国可比,还需探讨其他可以比转换的方法。

[Objective] Based on the “Work Plan for Cultivated Land Resource Quality Classification” drawn up by the Third National Land Survey, this research discussed the quality classification and grade conversion methods of cultivated land resources in Beihai, Guangxi. The results would provide a reference for practical applications such as balance between occupation and compensation as well as entry and exit about cultivated land through conversion into grades. [Method] The basic data through field inspection and interpret the relevant results of the second soil census were update, and the evaluation parameter system was adjusted for the local area updated the results of the quality of cultivated land. The classification of farmland resources quality in Beihai was evaluted and the classification results by statistics were obtained according to technical requirement. The Yinhai district of Beihai was selected to conduct empirical research and discuss the rationality as well as the advantages and disadvantages of the conversion methods based on three sets of grade conversion methods. [Result] The conversion result of the assigned points method was reasonable and better reflected the quality difference and distribution of cultivated land resources,but it was not comparable across the country. The distribution of the graded results produced by the permutation and combination method was unreasonable, and the results were easily affected by low-level indicators. The conversion result of the grade-addition method was more reasonable, which was convenient to achieve national comparability of the cultivated land quality, but the conversion results had a low grade span, and the difference was not strong.[Conclusion] The conversion method of grade points and sum method can meet the national comparability of cultivated land quality, and other comparable conversion methods need to be explored.