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

    研究成果: Article査読

    12 被引用数 (Scopus)

    抄録

    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.

    本文言語English
    ページ(範囲)151-155
    ページ数5
    ジャーナルPhotosynthetica
    46
    1
    DOI
    出版ステータスPublished - 2008 3

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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