Sensitivity of stomatal conductance to vapor pressure deficit and its dependence on leaf water relations and wood anatom
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ORIGINAL ARTICLE
Sensitivity of stomatal conductance to vapor pressure deficit and its dependence on leaf water relations and wood anatomy in nine canopy tree species in a Malaysian wet tropical rainforest Shoko Tsuji1 · Toru Nakashizuka2 · Koichiro Kuraji3 · Atsushi Kume4 · Yuko T. Hanba5 Received: 10 February 2020 / Accepted: 26 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Key message Canopy tree species with a large mean xylem vessel diameter has a high sensitivity of stomatal conductance to vapor pressure deficit in a wet tropical rainforest in Malaysia. Abstract We investigated the diurnal variation of stomatal conductance to water vapor (gs) and leaf water relations in nine tropical rainforest canopy tree species in Malaysia to investigate the sensitivity of stomatal conductance to VPD and its dependence on leaf water relations. We focused on the effect of wood anatomical properties on the stomatal sensitivity to VPD. Negative correlations were obtained between leaf-to-air VPD (VPDleaf) and gs for all species, in which interspecific variation was obtained for the sensitivity of gs to VPDleaf with the range of VPDleaf being 1.2–5.9 kPa. The species with large mean xylem vessel diameter had high sensitivity of gs to VPDleaf. Although significant variations were obtained among the species for leaf water relations, such as relative water content at the turgor loss point (RWCtlp) and water potential at the turgor loss point (Ψtlp), these water relations were not related to the stomatal sensitivity to VPDleaf. In the wet tropical forest in the present study, VPDleaf was the main regulator of gs in the nine tree species. The high sensitivity of gs to VPDleaf in the trees with a large vessel area may contribute to the maintenance of an adequate leaf water status, e.g., high levels of Ψleaf, throughout the day, across a period of varying air temperature. Keywords Atmospheric drought · Stomatal openness · Leaf water potential · Isohydric · PPFD
Introduction
Communicated by Nardini. * Yuko T. Hanba [email protected] 1
Center for Ecological Research, Kyoto University, 2 Hirano, Otsu, Shiga 520‑2113, Japan
2
Research Institute for Humanity and Nature, 457‑4 Motoyama, Kamigamo, Kita‑ku, Kyoto 603‑8047, Japan
3
The University of Tokyo Forests, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
4
Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi‑ku, Fukuoka 819‑0395, Japan
5
Faculty of Applied Biology, Kyoto Institute of Technology, Sakyo‑ku, Kyoto 606‑8585, Japan
Tree water-use strategies in relation to stomatal regulation are often classified into isohydric or anisohydric, in which Tardieu and Simonneau (1998) regarded anisohydric species as those in which open stomata allow marked decreases in leaf water potential with an increase in evaporative demand during the daytime, whereas isohydric species maintain an almost constant leaf water potential during the day that does not depend on the soil water statu
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