Transpiration rate of several tropical lowland rain forest trees in Sarawak, Malaysia
1995
Hiromi, T. (Ehime Univ., Matsuyama (Japan). Coll. of Agriculture) | Ninomiya, I. | Ogino, K.
Transpiration rate if several Tropical lowland rain forest trees viz. Dipterocarpus pachyphyllus, Mallotus leptophyllus, Elaeocarpus beccarii in Sarawaka, Malaysia was measured in situ by steady state porometer. The rate of transpiration seemed to depend on vapor pressure difference (VPD) between leaf and air. In upper canopy the rapid increase of leaf temperature due to intensive sunlight was observed in the morning. The transpiration rate increased and decreased in proportion to VPD during early morning and late afternoon in the lower range of VPD. VPD was kept at higher level during the daytime. Beyond the certain level of VPD the transpiration rate remarkably fluctuated. The cyclic raise and drop of the transpiration rate occurred within a very short time of period. It was supposed that this phenomenon was attributable to the quick stomatal open and close movement occurring in very short intervals with D. pachyphyllus
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