土壤交换性阳离子的组成与土壤理化性质有密切联系,是土壤改良利用和土壤类型划分的重要依据之一。对石灰性土壤,交换性钠可标志着土壤碱化程度。其程度划分是按交换性钠占交换性阳离子总量的比例来确定的。交换性镁等对土壤碱化也受人们所重视。所以通常需要分析土壤中各主要交换性阳离子和交换总量。 The composition of soil exchangeable cation is closely related to soil physical and chemical properties, which is one of the important bases for soil improvement and soil classification. For calcareous soils, exchangeable sodium may indicate the degree of soil alkalization. The degree of division is determined by the ratio of exchangeable sodium to total exchangeable cations. Exchangeable magnesium and other alkalinization of the soil by people attention. Therefore, it is often necessary to analyze the major exchangeable cations in the soil and the total amount exchanged.