Photosynthetic water use efficiency in tree crowns of Shorea beccariana and Dryobalanops aromatica in a tropical rain forest in Sarawak, East Malaysia

Y. Kitahashi, T. Ichie, Y. Maruyama, T. Kenzo, S. Kitaoka, S. Matsuki, L. Chong, T. Nakashizuka, T. Koike

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Photosynthetic water use efficiency (PWUE), stomatal conductance (g s), and water potential were measured at two different positions in the tree crown of two emergent tropical tree species (Shorea beccariana Burck, Dryobalanops aromatica Gaertn. f.). The trees were about 50 m high, in a tropical rain forest in Sarawak, East Malaysia. In both species, g s at the upper crown position at midday was lower than at the lower crown position, even though both positions were exposed to full sunlight; the difference was greater in S. beccariana. Hydraulic limitation occurs in the upper crown position in both species. A midday depression was observed in the photon saturated photosynthetic rate in both species, especially at the upper crown. However, PWUE was markedly higher in the upper crown than the lower crown at midday, even though no morphological adjustment was observed in the leaves; this difference was greater in S. beccariana.

    Original languageEnglish
    Pages (from-to)151-155
    Number of pages5
    JournalPhotosynthetica
    Volume46
    Issue number1
    DOIs
    Publication statusPublished - 2008 Mar 1

    Keywords

    • Dipterocarpaceae species
    • Hydraulic limitation
    • Leaf area and thickness
    • Nitrogen
    • Saturation irradiance
    • Specific leaf area
    • Stomatal conductance
    • Water potential

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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  • Cite this

    Kitahashi, Y., Ichie, T., Maruyama, Y., Kenzo, T., Kitaoka, S., Matsuki, S., Chong, L., Nakashizuka, T., & Koike, T. (2008). Photosynthetic water use efficiency in tree crowns of Shorea beccariana and Dryobalanops aromatica in a tropical rain forest in Sarawak, East Malaysia. Photosynthetica, 46(1), 151-155. https://doi.org/10.1007/s11099-008-0025-9