| Project/Area Number |
04454099
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
農業土木
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| Research Institution | Graduate School of Environmental Science, Hokkaido University |
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Principal Investigator |
TAKAHASHI Hidenori Graduate School of Environmental Earth Science, Hokkaido University, Associate Professor, 大学院・地球環境科学研究科, 助教授 (20001472)
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| Co-Investigator(Kenkyū-buntansha) |
HARADA Jiro Faculty of Agriculture, Saga University, Associate Professor, 農学部, 助教授 (00111485)
INOUE Takashi Faculty of Agriculture, Hokkaido University, Instractor, 農学部, 助手 (30203235)
FUJITA Hiroko Faculty of Agriculture, Hokkaido University, Instractor, 農学部, 助手 (50202289)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1992: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | Hygrophyte / High mire / Peat Land / Stomatal Conductance / Evapotranspiration / Water Balance / Drying Land / Water Physiology / 気孔抵抗 |
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| Research Abstract |
Vegetation type, water physiology and water/heat balances of hygrophytes community were investigated in the Sarobetsu Mire, North Hokkaido. The results are summarized as follows,
a) Diurnal changes of stomatal conductance were measured by a diffusion porometer for six species (Sasa palumata, Moliniopsis japonica, Myrica gale var.tomentosa, Ledum palusire var.diversipilosum, Chamaedaphne calyculata, llex crenata var.paldosa) growing in the Sasa-Hygrophytes mixed community.
b) Water potential at a depth of 10cm in the peat soil was closed to zero throughout the summer though the ground water level dropped to 40cm below the surface during dry weather.
c) The diameter of the subterranean stem of Myrica gale var. tomentosa were decreased and the length of them were extended with rising ground water level in this site.
d) Stomatal conductances of the six species were correlated negatively with daily maximum VPD (vapor pressure deficit). When the daytime VPD was large, stomatal conductance maintained at small values and VPD was the main factor to determine the transpiration.
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