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Article type: Cover
2001 Volume 45 Issue 1 Pages
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Article type: Appendix
2001 Volume 45 Issue 1 Pages
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2001 Volume 45 Issue 1 Pages
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2001 Volume 45 Issue 1 Pages
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Article type: Appendix
2001 Volume 45 Issue 1 Pages
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Article type: Appendix
2001 Volume 45 Issue 1 Pages
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Article type: Index
2001 Volume 45 Issue 1 Pages
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Article type: Appendix
2001 Volume 45 Issue 1 Pages
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S. YOSHINAGA
Article type: Article
2001 Volume 45 Issue 1 Pages
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Nobusuke IWASAKI, Makiko WATANABE, Masao YOSHIDA
Article type: Article
2001 Volume 45 Issue 1 Pages
2-13
Published: June 30, 2001
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Comparative study on Andosols developed under grassland and forest was carried out in regions with different lithological regime in Japan to discuss the influence of vegetation management to soil chemical properties. The following are the results of soil investigation and soil analysis on the four studied regions, which are Tamayama of northern Japan, Bodai of central Japan, Sanbe of western Japan, and Aso of southern Japan. Andosols properties have shown significant difference between grassland pedon and forest pedon. Continuous grassland use characterized Andosols with thick humic horizon, relatively, high humification degree, high base saturation degree, and low soil acidity. These characteristics are to be estimated as response of vegetation management, or human impact, such as burning or grazing, which effect to accelerate the circulation of bases. Soil humus properties of the surface soil of both grassland and forest pedon have shown regionality. In Tamayama, Bodai, and Aso region, a the significant difference in humification degree was represented by RF value and Δ logK, between grassland and forest pedon. In comparision, as for Sanbe region, the humification degree remained high even in the secondary forest soil. The difference of soil acidity between two types of vegetation control, grassland and forest, has shown geographical differentiation related to the diverse conditions of parent materials. Soils composed of layered silicate clay, especially remarked in Sanbe and Tamayama pedon, have wide ranged difference between grassland and forest. The existence of layered silicate clay in the Andosols, act to amplify the difference of soil acidity according to the strength of vegetation control.
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Norio YASUDA
Article type: Article
2001 Volume 45 Issue 1 Pages
14-22
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Based on GIS and GPS, the Soil Survey Support System was developed to use soil information in a soil map promptly and effectively in field conditions. The structure and functions of the system are summarized as follows. 1) The system consists of a light-weighted notebook-sized personal computer and DGPS including a satellite electric wave receiver with antenna and an antenna for a multiple frequency modulation broadcasting for the position correction. Software for the system was developed based on Visual-C language, so as to work with Windows 95 and 98. 2) A soil map and interpretation map of a requested area are in real time displayed in a needed scale. A profile description and physico-chemical properties are retrieved on request and displayed on the computer screen. Interpretation maps be easily and quickly prepared and displayed in terms of such soil characteristics as effective soil depth, the soil texture, depth of gravelly layer, phosphorus fixation capacity, moisture regime (paddy field) and drainage condition (paddy field). 3) The reproducibility of positioning with DGPS installed in the system was tested with 16 sites. Positioning error was less than 10m and found to be accurate enough to use in field conditions. The error was slightly larger in hilly and mountains areas than in the plains.
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Isao AKAGI, Yudzuru INOUE, Yoshitaka NAGATOMO
Article type: Article
2001 Volume 45 Issue 1 Pages
23-31
Published: June 30, 2001
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Many Quaternary tephra have been widely distributed in Southern Kyushu, Japan. It will be possible to estimate of chronological data on paleosol by stratigraphical correlation of tephras, which have studied owing to recent progress in tephrochronology. The major and minor elements (Fe, Ti, Mn, V and Zn) of ferromagnetic minerals in Aso-4, Kikai-Tozurahara, Ata, Aso-3, Ata-Torihama, Kakuto, Kobayashi-Kasamori and Hiwaki tephra which are representative middle to late Pleistocene tephra in southern Kyushu were analyzed. The results obtained as follows; 1) These tephra were characterized by the chemical composition of ferromagnetic minerals. The content of Ti, Mn, V and Zn in ferromagnetic minerals were very different from every other tephra; 2) Aso-4, Kikai-Tozurahara, Aso-3, Ata-Torihama, Kobayashi-Kasamori and Hiwaki tephra were clearly discriminated by the combination of the content ratios of Zn/tFe and V/Ti. On the other hand, Ata and Kakuto tephra were clearly distinguished by the combination of the content ratios of Zn/Ti and Mn/tFe; and 3) The analysis of the chemical composition of ferromagnetic mineral allowed to identify unknown two tephra which are middle to late Pleistocene tephra existed on and under the paleosol in Hitoyoshi basin. It was shown that the properties of chemical composition of ferromagnetic minerals in these tephra serves as a good indicator for the identification of these tephras.
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Takashi KUSABA, Takeshi OTA, Makoto NAKAI, Yoji AMANO
Article type: Article
2001 Volume 45 Issue 1 Pages
32-40
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The processes of the soil resources-decreasing with the advance of urbanization and the monitoring method of the soil resources-changing in urban fringes are studied. The south_east part of Saitama Prefecture; Misato City, Koshigaya City, Yoshikawa Town and Matsufuse Town, is selected as the model area and analyzed by means of GIS method. The GIS methods consist of three operation units; the land use map making from satellite data by maximum likelihood method, the soil map digitizing by GIS, and overlying the land use map and the soil map and calculation of area. In this area the paddy field is distributed on Peat soils, Gray lowland soils and Gley soils and the upland field on Brown lowland soils before the urbanization. The method is suitable for the investigation of the soil resources-changing in the lowland soils area, however is unsuitable in the upland area. On lowland area, in the lately 1970s and early 1980s the Peat soils and Gley soils decreased mainly. In the lately 1980s use of Gray lowland soils tend to increase. The processes of the soil resources-decreasing with the advance of urbanization are estimated to progress as follows ; in lowland farming field Brown lowland soils distributed on natural levee decrease mainly at first stage, area occupied by Peat soil and Gley soils divert from farming to housing and commercial and industrial land use at second stage, decrease in farming field covered with Gray lowland soils tend to increase at last stage.
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Masayuki TOYOSIEMA
Article type: Article
2001 Volume 45 Issue 1 Pages
41-47
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Tadao HAMAZAKI
Article type: Article
2001 Volume 45 Issue 1 Pages
48-55
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Kazutake KYUMA
Article type: Article
2001 Volume 45 Issue 1 Pages
56-64
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[in Japanese]
Article type: Article
2001 Volume 45 Issue 1 Pages
65-68
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[in Japanese]
Article type: Article
2001 Volume 45 Issue 1 Pages
69-72
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Kaoruko SUNAGA
Article type: Article
2001 Volume 45 Issue 1 Pages
73-74
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[in Japanese]
Article type: Article
2001 Volume 45 Issue 1 Pages
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Article type: Bibliography
2001 Volume 45 Issue 1 Pages
76-76b
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Article type: Appendix
2001 Volume 45 Issue 1 Pages
77-82
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Article type: Appendix
2001 Volume 45 Issue 1 Pages
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2001 Volume 45 Issue 1 Pages
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2001 Volume 45 Issue 1 Pages
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2001 Volume 45 Issue 1 Pages
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Article type: Cover
2001 Volume 45 Issue 1 Pages
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2001 Volume 45 Issue 1 Pages
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