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土被结构是土壤地理学的一个重要分支学科。土壤组合是土被结构的基本组成单元，它具有完全明确的生态内容，可以作为土地评价单元。本文分析了江津县北部低山丘陵区的自然、社会经济条件，选取能代表不同地貌类型区的典型地段，应用遥感航片，结合野外调查划分出不同类型区的土壤组合类型，并提出了本区土被结构的三级分类系统，编制了本区土壤组合类型图（１∶５００００）。在此基础上以土壤组合为单元进行了土地资源评价及土地资源制图。
Soil structure is an important branch of soil geography. Soil composition is the basic unit of soil structure, it has a completely clear ecological content, can be used as land evaluation unit. This paper analyzes the natural and socio-economic conditions in the northern hilly area of Jiangjin County, selects typical areas that can represent different types of geomorphological areas, and uses remote sensing aerial photographs combined with field surveys to separate the types of soil assemblages in different types of areas. Soil structure by the three-tier classification system, the preparation of the type of soil combinations map (1: 50000). On this basis, the land resources evaluation and land resource mapping were carried out based on soil combination.