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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

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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.

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Acknowledgements

This study was conducted in accordance with memorandums of understanding signed in 2005 by the Sarawak Forestry Corporation (SFC, Kuching, Malaysia) and the Japan Research Consortium for Tropical Forests in Sarawak (JRCTS, Sendai, Japan). We thank the Sarawak Forest Department, Sarawak Forest Corporation, for their permission and support for our study. We appreciate Dr. Taeko Wakahara and Dr. Katsushige Shiraki for providing the data for soil water content. We appreciate Dr. Shoko Sakai for helping with our research. We appreciate Yuichiro Kanzaki for supporting the data recovery. We appreciate Dr. Tomonori Kume and Dr. Shoko Sakai for helping our research.

Funding

The research was partly supported by JSPS (17H01477 and 17H03835).

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Correspondence to Yuko T. Hanba.

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The authors declare that they have no conflict of interest.

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Communicated by Nardini.

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Tsuji, S., Nakashizuka, T., Kuraji, K. et al. 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. Trees 34, 1299–1311 (2020). https://doi.org/10.1007/s00468-020-01998-5

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  • DOI: https://doi.org/10.1007/s00468-020-01998-5

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