交换性阳离子组成、养分全量及速效含量可作为评价红粘土红壤化学肥力演化的指标。

The composition of exchangeable cation and the soil nutrient content can be used as the indexes to evaluate soil chemical fertility evolution, especially the former is more important.

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根据宣城沸石化学成分、可交换阳离子组成和热处理晶体结构演化，判断宣城沸石为富钙斜发沸石，具有低热稳定性的特点。

According to chemical composition, exchangeable cation and thermal behaviors of crystal structure, Xuancheng zeolite should belong to calcium-rich clinoptilolite with low thermal stability.

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通过对青海主要土壤类型剖面的有机质、机械组成、阳离子交换量三者之间的关系分析。

The relationship was analysised between organic matter, soil granular composition and cation exchange capacity(CEC) in Qinghai major soil types.

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