| Project/Area Number |
05304017
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
IWATSUBO Goro Kyoto University, Agriculture Professor, 農学部, 教授 (00026395)
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| Co-Investigator(Kenkyū-buntansha) |
ANDO Makoto Kyoto University, Agriculture Lectuerer, 農学部, 講師 (00133132)
KAWANABE Saburo Kyoto University, Agriculture Professor, 農学部, 教授 (10026396)
NAGAYAMA Yasuhide Shimane University, Agriculture Instructor, 農学部, 助手 (60228062)
KATAGIRI Shigeo Shimane University, Agriculture Professor, 農学部, 教授 (00032649)
CHIBA Kyozo Okayama University, Agriculture Professor, 農学部, 教授 (10036741)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 1994: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1993: ¥5,100,000 (Direct Cost: ¥5,100,000)
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| Keywords | FOREST WATERSHED / PURIFICATION FUNCTION / EXTENSIVE STUDY / WATER CHEMICALS / PRECIPITATION / RUNOFF WATER / MINERAL CYCLING / WARMTH INDEX / 生物窒素固定 |
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| Research Abstract |
Extensive comparison studies were carried out to evaluate the function of forest ecosystems to purify the environmental pollutant.
1. Water chemicals of rain and runoff stream water from thirteen forested watersheds which are located in the area of Hokkaido, Gifu, Mt.Hiei in Kyoto, and Takamatsu in Japan, Southern China and Northern Thailand were analyzed.According to Warmth Index, those six areas are classified in cool-temperate, warm-temperate or sub-Tropical zones.Both in cool-temperate and sub-tropical areas, major dissolved ions in runoff water were low comparing with those in warm-temperate area.
2. In Shimane prefecture, high concentration of Na^+, Cl^-, NO_3^-, SO_4^<2-> ions was detected in snowfall.However, the effects of these chemicals on runoff water were not detected.
3. In Yamaguchi Prefecture, wet-and dry-fall to the forest was separately measured.So-called man-made pollutants were contained more in dry-fall.
4. On the three kinds of forest soils in Chugoku area, the hydraulic conductivity was compared using heavy water and heavy nitrogen.
5. Through the measurements of natural abundance of ^<15>N in rain and soil water, denitrification in the watersheds was confirmed.
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