Effect of Removal of Free Oxides on Changes in Dispersibility and Charge Characteristics of Soils
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概要
- 論文の詳細を見る
Changes in dispersibility and charge characteristics of two soils with different colloidal properties were investigated after various extracting treatments of free oxides. The soil samples were taken from the upland field in a reclaimed area (highly dispersive) and from the B horizon of an adjacent forest area (physically stable), both of which derived from the same parent material. Special attention was paid to selective extraction of Al and Fe oxides. After the extraction of free oxides by conventional methods such as DCB or oxalate treatment, dispersibility of the soils which always became too high made it difficult to relate the amounts of removed oxides with the changes in dispersibility. Thus, extractions by milder treatments were designed in order to remove varying amounts of free oxides using several organic salt solutions. Among the treatments, citrate and oxalate extracted more Al oxides, followed by tartrate. Dithionite, acetate, and NaCl extracted only trace amounts of Al oxides. This order seemed to be controlled by the stability constants of organo-Al complexes. The changes in dispersibility of the residual soil were related to the amount of extracted Al, especially for the forest soil, but not to Fe or Si. After these treatments, the amount of positive charges of the soil decreased while that of negative charges increased. For instance, the amount of total charges of the forest soil after DCB treatment was 1.5 times larger than that of the non-treated soil at the dispersion pH, which was mainly attributed to the removal of Al oxides. Although the amount of removed Al oxides was relatively small, the changes in dispersibility of the residual forest soil were drastic, indicating that free oxides (mainly Al) removed by milder treatments were the most external, active fractions. This interpretation suggests the practical importance of the release of amorphous sesquioxides in the natural weathering process in preventing the dispersion of potentially dispersive soils.
- 社団法人日本土壌肥料学会の論文
著者
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Kosaki Takashi
Faculty Of Agriculture Kyoto University
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Kitagawa Y
Fukui Prefectural University
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Kitagawa Yasuo
Graduate School Of Bioscience Fukui Prefectural University
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KYUMA Kazutake
Faculty of Agriculture, Kyoto University
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Kyuma K
Faculty Of Environmental Science The University Of Shiga Prefecture
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Kyuma Kazutake
Faculty Of Agriculture Kyoto University
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Itami Katsuhiko
Faculty of Agriculture, Kyoto University
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Kitagawa Yasuo
Faculty of Bioscience, Fukui Prefectural University
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Itami K
Fukui Prefectural Univ. Fukui Jpn
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Itami Katsuhiko
Faculty Of Agriculture Kyoto University
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Kyuma Kazutake
Faculty Of Agriculture Kinki University
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