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Water balance and physiology of hygrophyte in cold regions.

Research Project

Project/Area Number 04454099
Research Category

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

Allocation TypeSingle-year Grants
Research Field 農業土木
Research InstitutionGraduate School of Environmental Science, Hokkaido University

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)

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)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
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)
KeywordsHygrophyte / High mire / Peat Land / Stomatal Conductance / Evapotranspiration / Water Balance / Drying Land / Water Physiology / 気孔抵抗
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.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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