Relation between process of oxidation of sulfur compounds and water content in a coastal muddy soil.

沿海泥质土壤中硫化合物氧化过程与含水量的关系。

• 批准号: 02660238
• 负责人: ADACHI Tadashi
• 金额: $ 1.22万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02660238/
• 关键词: Acid sulfate soil; Muddy soil; Sulfur compound; Soil microorganism; Soil pH; Water content (pF); 海成粘土; 乾燥; 土壌水分

The relation between the process of oxidation of sulfur compounds and the water content(water moisture suction)in a coastal muddy soil was examined.The concentration of sulfuric ions increased with the progressing of oxidation of sulfur compounds containing in pyrite etc. and consequently the soil pH decreased in the coastal muddy soil. The treatment of salt removal enhanced the activity of microorganisms participating sulfur oxidation and formation of sulfuric ions. Actually, the soil pH decrease was occurred more greatly in the soil containing lower salt concentration.In spite of the difference of the soil pF values, the soil pH decreased from 7.6 to 3.0 - 4.0, after two years drying of the soil. Especially, the oxidation of sulfur compounds occurred at the pF values of 4.0 to 4.4 and the lowest pH was observed at the pF 2.8.Accordingly, we concluded that the decrease of soil pH in a coastal muddy soil was mainly occurred by microorganisms which oxidize sulfur compounds under the condition of higher-water than pF 3.0.

研究了沿海泥质土壤中硫化合物的氧化过程与含水量（吸湿性）之间的关系。硫离子浓度随着黄铁矿等中含有的硫化合物氧化的进行而增加，从而使土壤中的硫离子浓度增加。沿海泥质土壤的 pH 值下降。除盐处理增强了微生物参与硫氧化和硫酸离子形成的活性。实际上，含盐量较低的土壤中，土壤pH值下降幅度更大。尽管土壤pF值存在差异，但土壤干燥两年后，土壤pH值从7.6下降到3.0-4.0。特别是，硫化合物的氧化发生在 pF 值为 4.0 至 4.4 时，并且在 pF 2.8 时观察到最低 pH。因此，我们得出结论，沿海泥质土壤中土壤 pH 值的降低主要是由氧化硫的微生物引起的。水含量高于 pF 3.0 的条件下的化合物。