Pedologist
Online ISSN : 2189-7336
Print ISSN : 0031-4064
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Volume 41, Issue 1
Displaying 1-20 of 20 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1997 Volume 41 Issue 1 Pages Cover1-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_Cover1
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  • [title in Japanese]
    Article type: Cover
    1997 Volume 41 Issue 1 Pages Cover2-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_Cover2
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages App1-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_App1
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages App2-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_App2
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages App3-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_App3
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  • [title in Japanese]
    T. HIGASHI
    Article type: Article
    1997 Volume 41 Issue 1 Pages 1-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_1
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  • Classification of Soils on the Raised Coral Reef Terraces of Minami-Daito Island : I. Occurrence of Haplic Lixisol or Typic Rhodudalf in Japan
    Yuji MAEJIMA, Shizuo NAGATSUKA, Teruo HIGASHI
    Article type: Article
    1997 Volume 41 Issue 1 Pages 2-14
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_2
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    Classification of the soils on the raised coral reef terraces of Minami-Daito Island, located in the humid subtropical region of Japan, were studied based on their general chemical properties and forms of free iron oxides. The results are as follows: 1) On the higher terraces, Haguue (45〜50 m.a.s.l), Red soil and Yellow soil are widely distributed. In the Red soil, the activity ratio of iron (Fe_o/Fe_d) ranges from 0.01 to 0.07, and the crystallinity ratio of iron [(Fe_d-Fe_o)/Fe_t ranges from 0.77 to 0.81, while in the Yellow soil, they range from 0.01 to 0.05 and from 0.78 to 0.85, respectively. The Red soil approximately corresponds to Haplic Lixisol close to Rhodic Nitisol (FAO-Unesco) or Typic Rhodudalf (USDA Soil Taxonomy). On the other hand, the Yellow soil corresponds to Haplic Acrisol or Typic Kandiudult. 2) On the lower terraces, Hagushita (15 m.a.s.l.), Terra rossa-like soil is distributed and approximately corresponds to Haplic Lixisol or Eutric Cambisol, Typic Hapludalf or Typic Eutrochrept, respectively. 3) On the sea side slope (20 m.a.s.l.), Terra fusca-like soil is distributed and corresponds to Chromic Luvisol or Typic Hapludalf. Consequently, the Red and Yellow soils distributed on the higher terraces of Minami-Daito Island are similar to the lateritic red soils widely distributed in subtropical South China, and considered to be older and more weathered than the Red-Yellow soils (Udults) which have hitherto been reported from Southwest Japan.
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  • Soils on the Raised Coral Reef Terraces of Minami-Daito Island : II. Clay Mineral Composition
    Yuji MAEJIMA, Shizuo NAGATSUKA, Teruo HIGASHI
    Article type: Article
    1997 Volume 41 Issue 1 Pages 15-22
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_15
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    Clay mineral composition was investigated on the soils formed on the raised coral limestone terraces under humid subtropical maritime climate of Minami-Daito Island. The outline of results is as follows: 1) On the higher terraces, Haguue (45〜50 m.a.s.l), Red soil (Haplic Lixisol, Typic Rhodudalf) and Yellow soil (Haplic Acrisol, Typic Kandiudult) mainly contained kaolinite, illite, gibbsite and goethite. The content of kaolinite in Yellow soil was higher than that of Red soil. 2) On the lower terraces, Hagushita (15 m.a.s.l.), clay mineral composition of Terra-rossa-like soil (Haplic Lixisol, Typic Hapludalf) was similar to those of Red soil and Yellow soil, except that a small amount of vermiculite was present in this soil. 3) On the sea side slope (20 m.a.s.l.), Terra fusca-like soil (Chromic Luvisol, Typic Hapludalf) mainly contained vermiculite, kaolinite and illite with a small amount of gibbsite and goethite. Judging from the fact that Red and Yellow soils of Minami-Daito Island mainly contained kaolinite and gibbsite, they are similar to the lateritic red soils in subtropical South China, and also considered to be older in the period of soil genesis and in more advanced development stage than the Red-Yellow soils (Udults) from Southwest Japan.
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  • Alteration of 2:1-type Clay Minerals in a Gray Lowland Soil Derived from Permian Sediments in Takahama Cho, Fukui Prefecture
    Yasuo KITAGAWA, Katsuhiko ITAMI, Yoshihito BANDO
    Article type: Article
    1997 Volume 41 Issue 1 Pages 23-31
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_23
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    The bio-hydrologic alteration of 2:1-type clay minerals in a Gray Lowland soil derived from Permian sediments was discussed, making the comparision between difference of these minerals in the sand fraction and clay one, by means of XRD method, DTA, TG and IR spectrometry. The result is summarized as follows: 2:1-type clay minerals should release iron from their interlayer position and silicate layer lattice as resulting in the seasonally reductive condition with vertical movement of grand water in soil horizon. Chlorite and mica minerals altered partially to chlorite-vermiculite intergrade and vermiculite, in a Gray Lowland soil derived from the Permian sediments classified into the Early Ana-diagenesis, respectively. Previous study also indicated such alteration of 2:1-type clay minerals. These results were reverse to the formation of chlorite from vermiculite at the topsoils of two excessively drained Brown Lowland soils in Ogawa Machi, Saitama Prefecture reported by Mitsuchi (1967). This difference should be caused by the hydrologic condition between two soils.
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  • Characteristics of Induration of Tephra-derived Soils in Kyushu : (2) Strength of soil block and micromorphology of "Nigatsuchi"
    Hideo KUBOTERA, Ichiro YAMADA
    Article type: Article
    1997 Volume 41 Issue 1 Pages 32-41
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_32
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    "Nigatsuchi" is the buried volcanic ash soil distributed in western foot area of Aso volcano. "Nigatsuchi" has the unique property that it shrinks and becomes very hard by air-drying. We investigated the degree of hardening and shrinking, and the micromorphology in the moist state and the air-dried state using the nine "Nigatsuchi" samples and five common Andisol samples (non-Nigatsuchi). Unconfined compressive strength (kg/cm^2) of soil blocks of "Nigatsuchi" and non-Nigatsuchi was 5 or less in moist state. The strength of "Nigatsuchi" increased up to 10 or more by air-drying whereas the strength of non-Nigatsuchi showed no or little increase. The volume of soil blocks of "Nigatsuchi" and two non-Nigatsuchi samples decreased up to about 50% or less in comparison with moist state by air-drying whereas the volume of soil blocks of three non-Nigatsuchi samples decreased up to 70% or more in comparison with moist state. Unconfined compressive strength and shrinkage of air-dried "Nigatsuchi" was remarkably larger than other volcanic ash soils in Japan. Soil blocks of "Nigatsuchi" did not slake by repeated treatment of air-drying and soaking in water whereas non-Nigatsuchi slaked by this treatment. "Nigatsuchi" had small amount of pores which were not connected one another, and the type of micro-structure was vughy. Non-Nigatsuchi had large amount of pores which were connected one another and the type of microstructure was granular, crumb or spongy.
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  • Identification of tephra deposits in the cumulative Andisols profile in Miyakonojo basin
    Yuduru INOUE, Yoshitaka NAGATOMO, Hiroshi TAKAKI
    Article type: Article
    1997 Volume 41 Issue 1 Pages 42-54
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_42
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    Identification of tephra deposits in the cumulative Andisols profile in Miyakonojo basin was investigated based on stratigraphic relationships, primary mineral composition, and chemical composition of ferromagnetic minerals of them. The results obtained as follows; 1) It was found that there was Ikedako tephra deposits from erupted Kaimon volcano group, which has the presence of abundant hornblende and quartz component between Akahoya layer (IV laver) and Kuroniga (humus layer; IIIAT). 2) Using the chemical composition (T-Fe, Ti, Mn, V, and Zn) in ferromagnetic minerals, some of the new tephra deposits were identified like as Taisho tephra, Sueyoshi tephra, Satsuma tephra, and Takatoge 6 tephra in cumulative Andisols profile in Miyakonojo basin. 3) It was also found that development of the cumulative Andisols profile in Miyakonojo basin have been formed from Takatoge 6 tephra deposits, which was erupted 22,500 y.B.P.. It was found that the development of a lower unit of the Brown Loam layer have been formed during 22,500-11,000 y.B.P.; it indicates in about season of Last Glacial Stage, and the part of upper unit (humus layer) during 11,000-7,500 y.B.P.; it indicates in warming age which periods of Last Glacial Stage, respectively. It was found that humus layer (Kuroniga) overlying on Akahoya, on Mi-ike tephra, and on Bunmei tephra developed during 5,700-4,160 y.B.P., 4,160 y.B.P.-A.D.1471 and A.D.1471-1914, respectively. The present surface soil has been developed since A.D.1914.
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  • A Report on the 44th Field Workshop of Pedologist(Profiles)
    Syuntaro HIRADATE
    Article type: Article
    1997 Volume 41 Issue 1 Pages 55-56
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_55
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  • 「Daishiki」-Approach on the Genesis of Kuroboku Soils
    M. HOSONO
    Article type: Article
    1997 Volume 41 Issue 1 Pages 57-58
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_57
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages 59-66
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_59
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages App4-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_App4
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages App5-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_App5
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages App6-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_App6
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  • [title in Japanese]
    Article type: Appendix
    1997 Volume 41 Issue 1 Pages App7-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_App7
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  • [title in Japanese]
    Article type: Cover
    1997 Volume 41 Issue 1 Pages Cover3-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_Cover3
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  • [title in Japanese]
    Article type: Cover
    1997 Volume 41 Issue 1 Pages Cover4-
    Published: June 30, 1997
    Released on J-STAGE: June 30, 2018
    DOIhttps://doi.org/10.18920/pedologist.41.1_Cover4
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