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1987 Fiscal Year Final Research Report Summary

Affecting factors on the concentration and amount of forest run-off waterchemicals.

Research Project

Project/Area Number 61560166
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionKyoto University

Principal Investigator

IWATSUBO Goro  Faculty of Agriculture, Kyoto University, Associate Professor, 農学部, 助教授 (00026395)

Project Period (FY) 1986 – 1987
KeywordsForest Ecosystem / Water Chemistry / Vertical Distribution / Seasonal Change / Floodwater / 硝酸態窒素
Research Abstract

1. Vertical distribution of waterchemicals in a forest ecosystem.
Precipitation, forest throughfall, a litter layer, 5, 10, 20, 30, 50, 70 cm soil layers, and stream run-off water were collected vertically 2-4 times per month, and the waterchemicals therein were studied. Plastic pipes with an inside diameter of 19.5cm were inserted vertically into each soil layer to collect the water samples. The concentration of each mineral in the precipitation increased in the throughfall. While infiltrating through each soil layer, the concentration of NH_4-N, organic-N, P, K, Cl, So_4 decreased. On the other hand, NO_3-N, Ca, and Mg increased in each soil layer and reached a maximum at around 70cm in depth.
2. Seasonal change of waterchemicals in precipitation and stream run-off water.
Na and Cl in precipitation increased in the winter due to sea salt which wascarried by the north-west monsonn. The increase of Cl affected the concentration in stream water. NO_3-N in stream water incresed from April with the increase of biochemical activity in the soil, reaching a maximum late in the autumn. After the decrease in winter, it was flushed again during the snow melting season. SO_4, Ca, Mg in stream water tended to decrease in the summer when run-off water increased. Seasonal change was not detected in pH, SiO_2, NH_4-N, org-N, or Na.
3. Change of the concentration of waterchemicals in floodwater.
NO_3-N concentration in stream water increased with the increase in run-off water and reached a maximum when run-off water reached a maximum, and decreased with the decrease in water. Na, Mg, and SO_4 tended to decrease with the increase in water. The change of Cl depended on the season of floods, and those of Ca and K depended on the watersheds.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 岩坪五郎: 日本林学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒田幸夫: 日本林学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒田幸夫: 日本林学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒田幸夫: 日本林学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 徳地直子: 日本林学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉良竜夫,堤利夫編: "水資源の保全,琵琶湖流域をめぐる諸問題" 人文書院, 231 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Goro Iwatsubo: "The concentration and amonunt of waterchemicals in pricipitation and forest run-off." Journal of the Japanese Forestry Society.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yukio Kuroda: "Comparison of run-off waterchemicals between forest watershed and golf play ground." Journal of the Japanese Foretry Society.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yukio Kuroda: "Budget of waterchemicals in Ryuou experimental watershed." Journal of the Japanese Forestry Society.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yukio Kuroda: "Change of the concentration of waterchemicals in floodwater." Journal of the Japanese Forestry Society.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Naoko Tokuchi: "Vertical distribution of waterchemicals in a forest watershed." Journal of the Japanese Forestry Society.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshio Tsutsumi: Effects of forest on the budgets of waterchemicals and the run-off water quality. In 'Conservation of waterresources' edt. by Tatsuo Kira. 231 (1987)

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

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Published: 1989-03-30  

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