XVI International Botanical Congess

Malaysia Ecophysiological traits of Dipterocarpus sublamellatus with different regenerating phases were studied in a rainforest of Malaysia. Seedlings and saplings showed large reductions in maximum photosynthesis, respiration, light compensation point, and light-use efficiency. Main-canopy leaves showed the highest chlorophyll content and Rubisco activity. Emergent leaves showed considerably lower water potential and exhibited photo-inhibition in the afternoon. Emergent leaves were able to attain nitrogen content and leaf specific mass more than threefold of seedling leaves. As a result, ecophysiological traits can be diagnostic features of the regeneration status of D. sublamellatus in tropical forest.