Photosynthetic water use efficiency in tree crowns of <Emphasis Type="Italic">Shorea beccariana</Emphasis> and <Emphasis Type="Italic">Dryobalanops aromatica</Emphasis> in a tropical rain forest in Sarawak,East Malaysia |
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| Authors: | Y Kitahashi T Ichie Y Maruyama T Kenzo S Kitaoka S Matsuki L Chong T Nakashizuka T Koike |
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| Institution: | (1) Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;(2) Hokkaido University Forests, Sapporo 060-0809, Japan;(3) Forestry & Forest Products Research Institute, Sapporo 062-8516, Japan;(4) Forest Research Institute of Sarawak, Kuching, Sarawak, Malaysia;(5) Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan;(6) Institute of Humanity and Nature, Kyoto 603-8047, Japan;(7) Present address: Hokkaido Forest Products Research Institute, Asahikawa 071-0193, Japan;(8) Present address: Department of Forest Science, Kochi University, Nankoku 783-8502, Japan;(9) Present address: Graduate School of Life Science, Tohoku University, Sendai 980-8577, Japan |
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| 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. |
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| Keywords: | Dipterocarpaceae species hydraulic limitation leaf area and thickness nitrogen saturation irradiance specific leaf area stomatal conductance water potential |
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