耕地质量定级方法改进研究:以农安县为例

Modified method to improve quality classification of cultivated land in Nong'an County

耕地质量定级是全面掌握耕地质量状况,实现数量、质量和生态协调管理的重要手段.该文以农安县为例,梳理修正法的技术路线,针对修正法的不足提出2种改进办法.通过确定定级指标体系、计算定级指数、划分级别,从级别面积分布、空间重叠度、定级指数与土地纯收益相关性3个角度,比较修正法和改进法的评价结果.结果显示:修正法的定级指数跨度明显高于改进法的定级指数;修正法与改进法空间分布差异较大,2个改进法之间的空间分布差异较小;改进法各级别变异系数均低于修正法;改进法定级指数与土地纯收益相关性系数高于修正法.该研究提出了2种新的定级方法,并验证了方法的可行性,可以为耕地质量定级及相关研究提供新的思路.

Quality classification of cultivated land is important for coordinated management of quantity,quality and ecology of cultivated land.In this paper Nongan County was used as an example to sort out technical route of modified method,aiming at the shortcomings of modified method and to put forward two improved methods.Evaluations of modified method and two improved methods were compared from three respects:level area distribution,spatial overlap degree,grading index and land net income correlation.The grading index span of modified method was markedly higher than the two improved methods.The spatial distribution of modified method and two improved method were different,while spatial distribution of the two improved methods were smaller.The coefficient of variation at each grade of the improved method was lower than the correction method.Correlation coefficient of each improved method between index and land net income was higher than the correction method.The current paper put forward two new classification methods,and verified feasibility of the methods.This will provide new ideas for cultivated land quality classification and related research.