• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

EXPLORATION OF EFFECTIVE IMPROVEMENT IN THE ACID SULFATE SOILS AND SELECTION OF INDICATOR WEEDY PLANTS FOR JUDGEMENT ON ACIDIFICATION PROCESS

Research Project

Project/Area Number 08456120
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionOKAYAMA UNIVERSITY

Principal Investigator

ADACHI Tadashi  OKAYAMA UNIVERSITY,FACULTY OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY,PROFESSOR, 環境理工学部, 教授 (20012007)

Co-Investigator(Kenkyū-buntansha) SUGIO Tsuyoshi  OKAYAMA UNIVERSITY,FACULTY OF AGRICULTURE,PROFESSOR, 農学部, 教授 (20033269)
OKI Yoko  OKAYAMA UNIVERSITY,FACULTY OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY,ASSOCIATE PRO, 環境理工学部, 助教授 (30127550)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1996: ¥6,100,000 (Direct Cost: ¥6,100,000)
KeywordsAcid sulfate soil / pH / Iron-oxidizing bacteria / Indicator plant / Salt concentration / Dryness process / 乾燥課程 / 土壌水分(pF) / 鉄バクテリア / 硫酸イオン / 二価鉄 / 重金属 / 石灰中和 / パイライト
Research Abstract

The acid sulfate soils is one of the problem soils in the world. If they were to be reclaimed by appropriate methods, we expect to extend the acreage for feeding the more increased population in near future. The objectives of this research were to examine the acidification process of an acid sulfate soil from such a view point of soil water contents and biological activity, and evaluate the possibilities of utilization of indicator plants which suggest the improvement of the acidification of soils. The following are summaries of our results.
From the investigation of soil water contents and their physical and chemical characteristics, it was found that acidification of soils proceeded under the progression of dryness of soils . Even if a decline in pH value of soil was parallel with those in soil water contents at the period of immediately after drying, however, the specific range of soil water contents such as showing a striking low pH value appeared at a later period
In the range of a … More remarkable decline of pH, the acidification of soils result from the increase of surfuric ions, concurrently a remarkable increase in the number of iron-oxidizing bacteria was found . In more higher range of soil water contents, even if we observed only the exist of iron-oxidizing bacteria, an increase in the number of them had not occurred with the passage of time . While under more dryness conditions, it was not suitable conditions for feeding the iron-oxidizing bacteria.
Since the activity of iro-oxidizing bacteria was higher under such circumstances that the, initial salt concentration of soil was lower, the above-mentioned phenomenon with oxidation process, even if final step when Pyrite was oxidized was the same situation, occurred the more remarkably the less the initial salt concentration of soil.
Those fundamental studies suggested that it was more effective to improve the acid sulfate soil by the application of lime after soil was oxidized sufficiently under plastic limit conditions which indicated acute development of acidity at an initial dryness period.
On the other hand, the research on selection of indicator plants was carried on to clarify the adapted pH conditions of several weeds for their growth, and their range of adaptation in acidic soils. As a result, Phragmites australis, Schoenoplectus validus, Hydrocotyle umbellala and H.verticillata seemed to be possible to use as an indicator plant, especailly in highly acidic soils under wet conditions, while the gramineous weeds such as Miscanthus sinensis, Imperata cylindrica and Zoysia japanica under upland conditions . Less

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Yoko OKI: "Environmental management by using weedy plants" The Korean Journal of Weed Science. 18(2). 95-105 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.SUGIO et al.: "Isolation and Some Properties of a Strain of the Iron-oxidizing Bacterium Thiobacillus ferrooxidans Resistant to 2, 4-Dinitrophenol" Journal of Fement.Bioeng.86. 134-137 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.ZEIDA, T.SUGIO et al.: "Purification and Characterization of Gallic Acid Decarboxylase from Pantoea agglomerans T71" Appl.Environ.Microbiol.64. 4743-4747 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 足立忠司、沖 陽子 他2: "酸性硫酸塩土壌生成に及ぼす温度の影響" 平成11年度農業土木学会大会講演要旨集. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoko Oki: "Environmental Management by Using Weedy Plants" The Korean Journal of Weed Sci.Vol.18 (2). 95-105 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tsuyoshi Sugio et al.: "Isolation and Some Properties of a Strain of the Iron-oxidizing Bacterium Thiobacillus ferrooxidans Resistant to 2,4-Dinitrophenol" Journal of Ferment.Bioeng.Vol.86. 134-137 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Zeida, T.Sugio et al.: "Purification and Characterization of Gallic Acid Decarboxylase from Pantoea agglomerans T71" Appl.Environ.Microbiol.Vol.64. 4743-4747 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoko OKI: "Environmental management by using weedy plants" The Korean Journal of Weed Science. 18(2). 95-105 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.SUGIO et al.: "Isolation and Some Properties of a Strain of the Iron-oxidizing Bacterium Thiobacillus ferrooxidans Resistant to 2,4-Dinitrophenol" Journal of Fement.Bioeng.86. 134-137 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.ZEIDA,T.SUGIO et al.: "Purification and Characterization of Gallic Acid Decarboxylase from Pantoea agglomerans T71" Appl.Environ.Microbiol.64. 4743-4747 (1998)

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi