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2002 Fiscal Year Final Research Report Summary

Study on initial process of soil erosion, on sloped, cropland in humid tropics using soil water-monitoring system

Research Project

Project/Area Number 12460032
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Plant nutrition/Soil science
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

FUNAKAWA Shinya  Kyoto University, Graduate School of Agriculture, Assistant Professor, 農学研究科, 助教授 (20244577)

Co-Investigator(Kenkyū-buntansha) TANAKA Sota  Kochi University, Faculty of Agriculture, Assistant, 農学部, 助手 (10304669)
HIRAI Hideaki  Utsunomiya University, Faculty of Agriculture, Assistant Professor, 農学部, 助教授 (20208804)
TANAKA Ueru  Kyoto University, Graduate School of Global Environmental Studies, Assistant Professor, 地球環境学堂, 助教授 (10231408)
Project Period (FY) 2000 – 2002
Keywordscapillary saturation / condition for surface runoff generation / datalogger / Internal drainage in soil profile / monitoring for soil water dynamics / monsoon climate / rainfall intensity / volumetric soil moisture content
Research Abstract

The condition and process of runoff generation were studied quantitatively by a water dynamics-monitoring system Three experimental plots were installed on sloped agricultural field in northern or northeastern Thailand under monsoon climate. The amount of rainfall, volumetric soil moisture content, and the amount of surface runoff were continuously monitored for every 10 minutes using a datalogger, which was installed in a small-scale field plot (1m × 1m or 25m × 2.5 m). Then the fate of water derived firm rainfall was divided into three destinations, i.e. increment of soil moisture, surface runoff and water loss. Based on these data, the rate of water loss and surface runoff and the initial conditions for their generation were determined as functions of rainfall intensity, initial soil moisture content, etc. The results obtained are summarized below :
1) Both the rate of water loss and surface runoff were strongly dependent on rainfall intensity ; and also on initial moisture content of the surface soil to some degree
2) In early stage of rainy season, water delved firm rainfall is largely lost through evapotranspiration, and partially accumulated into the soil as capillary water : As a result, gradual increment of soil water throughout rainy season is observed especially in medium to the fine textured soils
3) In late rainy season, a water loss through internal drainage increased
4) Different distribution patterns for rainfall intensity and soil moisture condition during rainy season were observed among the experimental plots, resulting in following types of runoff generation risks :
i) rainfall intensity-dependent risk in low elevation area in northeastem Thailand
ii) capillary saturation-enhanced risk in medium elevation area in northern Thailand
iii) risk by increased rainfall intensity in later rainy season in highland in northern Thailand

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Funakawa, S., Ashida, M., Yanebayashi, K.: "Charge characteristics of forest soils derived from sedimentary rocks in Kinki District, Japan, in relation to pedogenetic adidification prosess"Soil Science and Plant Nutrition. 49. 387-396 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 舟川 晋也: "ジオスタティスティクスを用いた四次元的土壌プロセスの解明"ペドロジスト. 47(1). 55-63 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Funakawa, S., Kosaki, T.: "Salt-effected soils under large-scale irrigation agriculture in Central Asia"Proceedings of International Symposium on Integration and regional researches to combat desertification, Tsukuba. 231-238 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 舟川 晋也, 小崎 隆(分担執筆): "地球環境ハンドブック、不破敬一郎・森田昌敏編、朝倉書店、東京"アラル海地域の砂漠化. 1129(708-717) (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Funakawa, S., Ashida, M., Yonebayashi, K.: "Charge characteristics of Forest soils derived from sedimentary rocks in Kinki District, Japan, in Relation to pedogenetic acidification process"Soil Sci.Plant Nut. 49. 387-396 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Funakawa, S.: "Forth-dimensional analysis on soil processes using -Budget of soil organic matter under cereal cropping in Northern Kazakhstan-"Pedologist. 47(1). 55-63 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Funakawa, S., Kosaki, T.: "Salt-affected soils under large-scale irrigation Agriculturc in central Asia"Proceedings of International symposium on Integration and regional researches to combat desertification, Tsukuba. 231-238 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Funakawa, S., Kosaki, T.: "Desertification in the Aral area, Handbook for global Environment (2nd edition), (Eds. Fuwa, K., Morita, M.,)(Tokyo, Japan)"Asakura-shoten. 1129(708-717) (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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