- KOREAN
- P-ISSN2287-8327
- E-ISSN2288-1220
- SCOPUS, KCI
ISSN : 2287-8327
Environmental controls on growing-season sap flow density of Quercus serrata Thunb in a temperate deciduous forest of Korea
Dennis Otieno (University of Bayreuth)
(University of Bayreuth)
(University of Bayreuth)
John Tenhunen (Department of Plant Ecology, University of Bayreuth, Bayreuth, Germany)
Abstract
Sap flux density (SFD) measurements were used, in combination with morphological characteristics of trees and forest structure, to calculate whole-tree transpiration, stand transpiration (St) and mean canopy stomatal conductance (Gs). Analysis based on the relationships between the morphological characteristics of trees and whole tree water use, and on the responses of SFD and Gs to short wave radiation (RR), vapor pressure deficit (VPD) and soil water content (SWC) during drought and non-drought periods were conducted. The results showed a strong positive correlation between whole tree transpiration and both tree diameter at breast height (DBH) (r2 = 0.95, P < 0.05) and sapwood area (SA) (r2 = 0.98,P < 0.05). Relationships between SFD and DBH (r2 = 0.25), as well as SA (r2 = 0.17) were weak. Daily SFD of Quercus serrata Thunb was closely related to VPD and RR. Although operating at different time scales, RR and VPD were important interacting environmental controls of tree water use. SFD increased with increasing VPD (<1 kPa) and RR. SWC had a considerable effect on stand transpiration during the drought period. The relationships between SFD, VPD and RR were distorted when SWC dropped below 35%.
- keywords
- drought effect, sapflow, stand transpiration, Quercus serrata
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