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本文提出了一个同时测定土壤的交换性酸和交换性碱的简易方法。将土壤的交换性酸和交换性碱区分为:Na-交换性酸、Ba-交换性酸和SO_4-交换性碱、F-交换性碱。用推荐的方法,在野外对华南地区由不同母质发育的砖红壤、赤红壤、红壤等10个剖面进行了测定。结果表明,红壤类土壤含有相当量的交换性碱,但其数量比交换性酸少。酸性母质发育的土壤的交换性酸和交换性碱量大于由基性岩发育的土壤者。红壤的交换性酸和碱的量随电性盐浓度的增高而增大,浓度大于0.1N后,数量基本不变。
This article presents a simple method for simultaneous determination of exchangeable acids and exchangeable bases in soils. The soil exchangeable acid and exchangeable base is divided into: Na-exchangeable acid, Ba-exchangeable acid and SO_4-exchangeable base, F-exchangeable base. Using the recommended method, 10 profiles of brick red soil, latosolic red soil and red soil developed in South China from different parent materials were measured in the field. The results showed that the soil of red soil contains a considerable amount of exchangeable alkali, but its quantity is less than that of exchangeable acid. The exchangeable acid and exchangeable alkalinity of soils developed from acidic parent material is greater than that of soils developed from basic rocks. The amount of exchangeable acid and alkali in red soils increased with the increase of the concentration of the electroactive salt. After the concentration was more than 0.1N, the amount of exchangeable acid and alkali did not change substantially.