在一定地貌单元内，由地形、母质和水文状况改变引起两种或两种以上不同土壤，或间有其他非土壤物质，呈有规律的变化所构成的制图单元。图斑内主要组分土壤和其他非土壤物质在1:24000比例尺的图上能够分开。
本文论述了土壤组合的概念，提出了土壤组合划分的五条原则。
In this paper, the concept of soil association is described and five principles in its division are suggested.
运用土壤组合构型中各种参数对海涂土壤资源的开发和利用进行了评价。
The reclamation and utilization of beach soil resources were evaluated by using various parameters of constitution of soil association.
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