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Article type: Cover
1990 Volume 34 Issue 2 Pages
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Article type: Cover
1990 Volume 34 Issue 2 Pages
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Article type: Appendix
1990 Volume 34 Issue 2 Pages
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Article type: Appendix
1990 Volume 34 Issue 2 Pages
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Y. Kato
Article type: Article
1990 Volume 34 Issue 2 Pages
103-
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Atsushi TORII
Article type: Article
1990 Volume 34 Issue 2 Pages
104-118
Published: December 31, 1990
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In Kinki and Sanyo district there are only a few volcanos and so it is said that volcanic ejecta is distributed only on terrace or flat plain on the summit. But even on slope a few tephra-origin particles are intermixed in the soil. Then in the Granite low-reliefed mountain areas mineralogical and tephrochlonological study was made to make clear mode of deposition of forest soils. The results are as follows. 1. There was no tephra-origin particles in eroded immature soils in this area. Contents ratio of volcanic glass in brown forest soils were generally 1〜10%. 2. In many soil profiles contents ratio of volcanic glass of B horizon was more than that of A horizon. In C horizons there were no volcanic glasses. 3. Volcanic glasses in the soils were classified to at least 3 types according to figure and refractive index. The distribution of volcanic glasses sujested that they were mixed into the soil because of mass-movement. 4. It is considered that volcanic glasses were mainly originated from AT-tephra (erupted from Aira caldera about 22000〜25000 yrs. ago) and Akahoya-tephra (erupted from Kikai caldera about 6300 yrs. ago).
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Yuefang Xiao, Yutaka OBA, Akeo TOMIKAWA, Teruo HIGASHI
Article type: Article
1990 Volume 34 Issue 2 Pages
119-127
Published: December 31, 1990
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Humus composition of several soils in China and Japan was studied. Soil samples were taken from Entic brunisolic soil, Orthic Brunisolic soil, Mountain Dark-brown soil and Mountain Shrubby-meadow soil at Mt. Taishan in China and also from Light-colored Andosol, Red-Yellow soil and Acid Brown Forest soil in Japan. Humus were extracted from the soils with 0.5% NaOH and a mixture of 0.5% NaOH and 0.1M Na_4P_2O_7 (1 : 1). Humus composition analysis was carried out with Kobo and Oba method, and then visible-ultraviolet absorption spectra of those humic acids were measured. From the results obtained, types of humic acids and their degrees of humification were evaluated. The types of humic acids extracted from Light-colored Andosol, Red-Yellow soil and Acid Brown Forest soil were A, Rp and P Type, respectively. But, the types of humic acids extracted from the soils at Mt. Taishan in China were all Rp, and it is apparent that the degree of humification were quite low.
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Tetsuo ANZAI
Article type: Article
1990 Volume 34 Issue 2 Pages
128-136
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Katsutoshi SAKURAI
Article type: Article
1990 Volume 34 Issue 2 Pages
137-143
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Mamoru HOSONO
Article type: Article
1990 Volume 34 Issue 2 Pages
144-155
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T. Kosaki
Article type: Article
1990 Volume 34 Issue 2 Pages
156-158
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K. Inoue
Article type: Article
1990 Volume 34 Issue 2 Pages
159-161
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H. Sumida, K. Inubushi
Article type: Article
1990 Volume 34 Issue 2 Pages
162-165
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T. Wakatsuki
Article type: Article
1990 Volume 34 Issue 2 Pages
166-168
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H. Yamada
Article type: Article
1990 Volume 34 Issue 2 Pages
169-
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T. Ito
Article type: Article
1990 Volume 34 Issue 2 Pages
170-171
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K. Kimura
Article type: Article
1990 Volume 34 Issue 2 Pages
172-173
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I. Yamada, H. Obara
Article type: Article
1990 Volume 34 Issue 2 Pages
174-176
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S. Nagatsuka, N. Miyaji
Article type: Article
1990 Volume 34 Issue 2 Pages
177-179
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[in Japanese]
Article type: Article
1990 Volume 34 Issue 2 Pages
180-181
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Article type: Appendix
1990 Volume 34 Issue 2 Pages
182-183
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Article type: Appendix
1990 Volume 34 Issue 2 Pages
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Article type: Bibliography
1990 Volume 34 Issue 2 Pages
185-
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Article type: Appendix
1990 Volume 34 Issue 2 Pages
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Article type: Appendix
1990 Volume 34 Issue 2 Pages
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Article type: Cover
1990 Volume 34 Issue 2 Pages
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Article type: Cover
1990 Volume 34 Issue 2 Pages
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