TY - JOUR
T1 - Photosynthetic water use efficiency in tree crowns of Shorea beccariana and Dryobalanops aromatica in a tropical rain forest in Sarawak, East Malaysia
AU - Kitahashi, Y.
AU - Ichie, T.
AU - Maruyama, Y.
AU - Kenzo, T.
AU - Kitaoka, S.
AU - Matsuki, S.
AU - Chong, L.
AU - Nakashizuka, T.
AU - Koike, T.
N1 - Funding Information:
Received 31 October 2005, accepted 24 August 2007. ●Corresponding author; fax: +81-11-706-2517, e-mail: tkoike@for.agr.hokudai.ac.jp. +Present address: Hokkaido Forest Products Research Institute, Asahikawa 071-0193, Japan. ++Present address: Department of Forest Science, Kochi University, Nankoku 783-8502, Japan. +++Present address: Graduate School of Life Science, Tohoku University, Sendai 980-8577, Japan Abbreviations: gs – stomatal conductance; Psat – photon-saturated photosynthesis; PPFD – photosynthetic photon flux density; PWUE – photosynthetic water use efficiency; SLA – specific leaf area; Ψxylem – xylem water potential. Acknowledgement: We thank the Forestry Department of Sarawak and the Sarawak Forestry Corporation in Malaysia for the opportunity to undertake the present tower monitoring study at Lambir Hills National Park. Partial financial support by CREST and JSPS is acknowledged.
PY - 2008/3
Y1 - 2008/3
N2 - 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.
AB - 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.
KW - Dipterocarpaceae species
KW - Hydraulic limitation
KW - Leaf area and thickness
KW - Nitrogen
KW - Saturation irradiance
KW - Specific leaf area
KW - Stomatal conductance
KW - Water potential
UR - http://www.scopus.com/inward/record.url?scp=40749101096&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=40749101096&partnerID=8YFLogxK
U2 - 10.1007/s11099-008-0025-9
DO - 10.1007/s11099-008-0025-9
M3 - Article
AN - SCOPUS:40749101096
SN - 0300-3604
VL - 46
SP - 151
EP - 155
JO - Photosynthetica
JF - Photosynthetica
IS - 1
ER -