講演詳細

生理部門[Tree Physiology]

日付	2024年3月10日
開始時刻	10:30
会場名	443
講演番号	G3
発表題目	Relationship between stem hydraulic conductivity and stomatal conductance sensitivity to VPD in Borneo's canopy trees. Relationship between stem hydraulic conductivity and stomatal conductance sensitivity to VPD in Borneo's canopy trees.
所属	京都大学
要旨本文	The relationship between stomatal conductance (Gs) and leaf moisture properties in response to diurnal changes in water vapor pressure deficit (VPD) was investigated for nine forest canopy tree species in a Malaysian moist tropical rainforest. Diurnal variation in leaf moisture properties and Gs were measured to determine the relationship between Gs change and diurnal VPD change, and to assess the influence of wood anatomical characteristics on stomatal sensitivity to VPD. For all species, negative correlations were found between VPD around the leaf (VPDleaf) and Gs, with Gs responses in the VPDleaf. Species with larger mean vessel diameters showed a greater responsiveness of Gs to VPDleaf, with stomata responding more rapidly to small changes in VPDleaf. In conclusion, we hypothesize that diurnal changes in VPDleaf are the main signal for stomatal regulation in the target tree species, and that larger vessel trees have greater stomatal responsiveness to diurnal changes in VPDleaf.
著者氏名	○Tsuji, Shoko1 ・ Nakashizuka, Tohru2 ・ Kuraji, Koichiro3 ・ Kume, Atsushi4 ・ Hanba, Yuko5
著者所属	1Kyoto University ・ 2Forestry and Forest Products Research Institute ・ 3The University of Tokyo ・ 4Kyushu University ・ 5Kyoto Institute of Technology
キーワード	Stomatal conductance (Gs), VPD (Vapor Pressure Deficit), Hydraulic conductivity (Ks), Leaf water potential, PPFD
Key word	Stomatal conductance (Gs), VPD (Vapor Pressure Deficit), Hydraulic conductivity (Ks), Leaf water potential, PPFD