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土系是土壤系统分类中的基层分类单元 ,具有聚合土体的概念 ,它与外界景观条件紧密联系 ,是通过实际调查而取得 ,有着易以鉴别的属性依据和定量指标 ,已不同于 30年代的土系及后期的土种 .为此 ,划分土系必须通过实际调查 ,在不同小区域内作土链或土壤组合研究 ,重视控制层段与特征土层的设立 ,获取土系单元的中心概念与边界范围 ,并作好土系间的评比 ,由此可保证土系划分的正确 .
Soil system is the basic taxonomic unit of soil system classification. It has the concept of polymeric soil. It is closely related to the external landscape conditions and is obtained through actual investigation. It has different attribute basis and quantitative index, which is different from that of the 1930s Of the soil system and later soil species.To this end, the division of soil system must be through actual investigation, in different small areas for earth chain or soil composition research, emphasis on the control section and characteristic soil layer establishment, access to the center concept of soil unit And border areas, and make the assessment of soil between the system, thus ensuring the division of soil system is correct.