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标题：Laboratory Studies on the Release of Cations and Anions in Acid Sulf ate Soils from Pulau Lumut, Selangor.
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作者：J. Shamshuddin ; Edgardo A. Auxtero
期刊名称：Pertanika Journal of Social Sciences & Humanities
印刷版ISSN：0128-7702
电子版ISSN：2231-8534
出版年度：1991
卷号：14
期号：3
出版社：Universiti Putra Malaysia
摘要：Acid sulf ate soils in Peninsular Malaysia are characterized by low pH and high amounts ofAl Alleviation of toxic ions in the soils by controlled drainage is recommended. However, potential acidity remains in the soils due to slow release of toxic ions during mineral weathering. A study was conducted to determine the release of AI and other ions by repetitive extraction of samples from the field and by aerobic incubation of samples in the laboratory. The results showed that Al was released continuously from the soils even after the sixth extraction. When the soils were allowed to undergo free oxidation under aerobic conditions Al, Mn, Fe, Ca, Mg, K, Na and S were released into the soil solutions due to breakdown of clay minerals. Activities of these ions increased significantly, resulting in an increase of electrical conductivity of the soil solution. Additionally, pH of the soil solution dropped. These commonly observed properties of acid sulfate soils have great implications on their management practices.
关键词：Acid Sulfate Soils; pH; Aluminium; Oxidation