ポドゾル性土壌に関する実験土壌学的試み : III)鉄・アルミニウム水溶液によるAO層抽出物の解析

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An experimental pedological study was carried out for clarifying the mechanism of podozolization. In attempt to clarify the role of organic matter in A0 horizon in mobilization and in precipitation of iron and aluminium, the solution of iron and aluminium at pH 4.0 reacted with the fresh of A0 horizon in the nitrogen atmosphere. The concentrations of extracting solution of iron were 0.5mg/l and 50mg/l, those of aluminium were 1.0mg/l and 50mg/l. Reacted solutions were filtered and analyzed to determine, pH, C, organic matter, reducing sugar, phenolic substance, carboxyl radical (-COOH), iron, aluminium and values of optical density at 300nm. The results were as follows: 1) With extracting solution of 50mg/l Fe, the degree of released iron was high such as 83.5mg/l, 663.2mg/l, 200.0mg/l for PD-LF, PD-H, Pw (i)-H, respectively. For aluminium, high amount release was only in case of PD-H. 2) The tentative interpretation of the above phenomena is a role of organic matter especially of PD-H in holding the amount of iron is rather high and the capability of holding iron is influenced by the added iron in extracting solution. This is somewhat same for the behavior of aluminium as in the case of PD-H but not for PD-LF, PW(i)-H. 3) As for the released organic matter in the extracting solution, reducing sugar and phenolic substance content was relatively high in PD-LF lower for PW (i)-H. The amount and nature of organic matter in the extracted solution could explain the behavior of iron and aluminim presented in A0 horizon.
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ポドゾル性土壌に関する実験土壌学的試み : III)鉄・アルミニウム水溶液によるAO層抽出物の解析

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