农用地分等中指标区间的自然质量分可比性研究--以河南省为例

农用地分等是具有全国（首先保证省内）可比的土地质量调查工程，其中土地本底（自然）质量的量化是以指标区（分等因素或因素组合相对一致的区域）为单元计算的。结合河南省农用地分等的实践，就指标区间的自然质量分可比性问题进行了探讨。通过分析《农用地分等规程》中自然质量分的计算方法，分析了自然质量分的可比对分等成果可比的作用，同时指出了其存在的问题，提出利用所建立的标准样地体系，进行自然质量分可比性研究的方法。

A Study of Comparability of Nature Quantity Cent in Different Criterion Districts of Farmland Classification--with Henan Province as an example

The classification of farmland is an investigation project with a comparability nationwide(in province first),in which land background quantity is calculated with criterion districts as cells.This paper discusses the problem of comparability of the nature quantity cent in different criterion districts by combining the practice of classification of farmland in Henan Province and analyzes the influence on the comparability of classification result caused by the comparability of nature quantity cent,and points out the problems through analyzing the calculation method of nature quantity cent in the regulations of classification of farmland.Finally,the paper introduces a method of studying the comparability of nature quantity cent by using the standard spot system.