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Vertical variation in leaf gas exchange parameters for a Southeast Asian tropical rainforest in Peninsular Malaysia
Authors:Yoshiko Kosugi  Satoru Takanashi  Naoto Yokoyama  Elizabeth Philip  Mai Kamakura
Affiliation:1. Laboratory of Forest Hydrology, Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
2. Forestry and Forest Products Research Institute, Tsukuba, Ibaraki, 305-8687, Japan
3. Forest Research Institute Malaysia, Kepong, 52109, Kuala Lumpur, Malaysia
4. KYOUSEI Science Center for Life and Nature, Nara Women’s University, Kita-uoya Higashimachi, Nara, 630-8506, Japan
Abstract:
Vertical variation in leaf gas exchange characteristics of trees grown in a lowland dipterocarp forest in Peninsular Malaysia was investigated. Maximum net photosynthetic rate, stomatal conductance, and electron transport rate of leaves at the upper canopy, lower canopy, and forest floor were studied in situ with saturated condition photosynthetic photon flux density. The dark respiration rate of leaves at the various heights was also studied. Relationships among gas exchange characteristics, and also with nitrogen content per unit leaf area and leaf dry matter per area were clearly detected, forming general equations representing the vertical profile of several important parameters related to gas exchange. Numerical analysis revealed that the vertical distribution of gas exchange parameters was well determined showing both larger carbon gain for the whole canopy and at the same time positive carbon gain for the leaves of the lowest layer. For correct estimation of gas exchange at both leaf and canopy scales using multi-layer models, it is essential to consider the vertical distribution of gas exchange parameters with proper scaling coefficients.
Keywords:
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