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Article type: Cover
1992 Volume 36 Issue 1 Pages
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Article type: Cover
1992 Volume 36 Issue 1 Pages
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
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I. Yamada
Article type: Article
1992 Volume 36 Issue 1 Pages
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Masahiko SAIGUSA, Sadao SHOJI
Article type: Article
1992 Volume 36 Issue 1 Pages
2-16
Published: June 30, 1992
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The occurrence of halloysite in Towada Holocene and Pleistocene Tephras was investigated. Formation of halloysite took place in the buried tephras occurring in "Si accumulating zone" where thickness of overburden tephra. deposits were mostly 2 m or greater, and the following forms of halloysite were observed ; spheroidal, elongated spheroidal, twin of spheroidal, chestnut-sheell-like and tubular. Tubular halloysite was dominated in buried A horizon or crack zone of outcrop, whereas spheroidal halloysite was dominated in B, C horizons or noncrack zone of outcrop. The absence of chestnut-shell-like halloysite in Holocene tephras indicate that spheroidal and tubular forms of halloysite were formed concurrently in these tephras. On the other hand, in Pleistocene tephras, the following transformation of halloysite was also suggested ; spheroidal → chestnut-shell-like → tubular. The mean size of spheroidal halloysite in B or C horizon or noncrack zone of outcrop and that of tubular halloysite in all tephras increased with age of tephra. Beside, the mean diameter of spheroidal halloysite in buried A horizon or crack zone of outcrop increased till Takadate tephra, but decreased in Tengutai tephra indicating the depletion of Al supply in this oldest tephra. Results obtained in this study thus indicate that surface weathering of tephra influenced the form and amounts of halloysite formed by geochemical weathering.
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Akemi TSUKIMORI, Hideaki HIRAI, Kazutake KYUMA
Article type: Article
1992 Volume 36 Issue 1 Pages
17-30
Published: June 30, 1992
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The changes in soil properties in relation to vegetation recovery and as a function of age after afforestation were studied in Mt. Tanakami of Shiga Prefecture. The following conclusions may be made. 1. Total carbon and nitrogen contents, the values of CEC, exchangeable potassium, aluminum and proton increased with time, while the values of pH (H2 0) de. creased. As for soil organic matter, both carbon contents in humic acid and in fulvic acid increased with time. 2. Clay and silt content hardly tended to increase with time, while initial condition of parent materials may have influenced clay and silt contents. As for clay minerals, kaolin minerals and clay mica seemed to be dominant in the plantation, while Al-vermiculite and gibbsite seemed to be dominant in the natural forest. 3. Improvements of soil physical properties with time such as decreases of solid phase percentage and bulk density, and increases of pore volume were recognized. 4. Factor analysis was carried out for selected chemical properties, and then three significant factors were extracted. After that, regression analysis was carried out for physical properties and CEC using these factors. Factor 1, organic matter factor, had a high correlation with time and influenced pore volume and solid phase percentage and bulk density. Factor 2 was regarded as silt content factor, while Factor 3 was regarded as clay content factor, both of which influenced the water retention. CEC was significantly influenced by all factors. 5. Thus, the said soil properties were improved with time, whereas significant differences were recognized in the values of the said properties between the plantation and the natural forest. Therefore it is considered that soils developed under the natural forest will not be formed within 100 years after afforestation on the denuded land.
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Hiroki Imai
Article type: Article
1992 Volume 36 Issue 1 Pages
31-39
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T. Sasaki, T. Katsui, S. Kumano
Article type: Article
1992 Volume 36 Issue 1 Pages
41-45
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K. Yamamoto
Article type: Article
1992 Volume 36 Issue 1 Pages
47-51
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H. Tanaka
Article type: Article
1992 Volume 36 Issue 1 Pages
53-54
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U. Tanaka, H. Hirai, K. Sakurai
Article type: Article
1992 Volume 36 Issue 1 Pages
55-56
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K. Kawase
Article type: Article
1992 Volume 36 Issue 1 Pages
57-58
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[in Japanese]
Article type: Article
1992 Volume 36 Issue 1 Pages
59-60
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[in Japanese]
Article type: Article
1992 Volume 36 Issue 1 Pages
60-61
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[in Japanese]
Article type: Article
1992 Volume 36 Issue 1 Pages
62-63
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
65-70
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
72-73
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
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Article type: Appendix
1992 Volume 36 Issue 1 Pages
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Article type: Cover
1992 Volume 36 Issue 1 Pages
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Article type: Cover
1992 Volume 36 Issue 1 Pages
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