Effect of Addition of Al Hydroxides on Changes in Dispersibility and Charge Characteristics of Soils
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概要
- 論文の詳細を見る
Using a soil from a newly reclaimed area where high dispersibility of fine particles had led to poor physical properties in the field, changes in dispersibility and charge characteristics after artificial precipitation of Al hydroxides onto the soil were investigated. Al hydroxides were precipitated by neutralization with NaOH of an acidic AlCl_3 solution in which the soil samples were placed. When the titration rates were changed, no significant differences in dispersibility were observed in the resultant soils. In the systems with the addition of 2 g kg^<-1> or less of Al(OH)_3, dispersion ratios of clays were almost identical with those of blank samples although the specific surface areas were reduced. In the systems with 5 g kg^<-1> or more of Al(OH)_3, considerable effects of Al hydroxides on reduction of clay dispersibility were recognized (e.g. 10 g kg^<-1> addition yielded less than one-third of the original ratio of the clay dispersion). A slightly larger decrease in dispersion was observed by the addition of 15 g kg^<-1> or more. As the amount of added Al increased, the amount of negative charges of the soil decreased while that of positive charges increased. The charge characteristics of the system with the addition of 20 g kg^<-1> of Al(OH)_3 were closer to those of the adjacent forest soil which was characterized by a very low dispersibility. It was inferred that added Al hydroxides polymerized to form Al polycation species that were not readily exchangeable, neutralizing negative charges of clays, and acting as interparticle bonding between the clays. On the other hand, forest soils were considered to have acquired a physical stability against the dispersion of fine particles as free Al oxides had been accumulated in the process of natural weathering. It was concluded that charge characteristics primarily determined the dispersion and flocculation behavior of soils and that Al hydroxides were important modifiers of charge characteristics of 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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