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A comparison of in situ leaf photosynthesis and chlorophyll fluorescence at the top canopies in rainforest mature trees
Tropical tree species are divided into two principal groups, climax (or shade-tolerant)and pioneer (or light demanding) tree species. The top canopy leaves of mature treesare exposed to high solar radiation, regardless of whether they are climax or pioneertrees. This article compares leaf physiology and morphology at the top canopies of aclimax Dipterocarpus corunutus tree and a pioneer Macaranga gigantea tree in arainforest, East Kalimantan. Their data indicate low light-use capacity and highsusceptibility for excess light energy of photosystem II in D. cornutus. The leafproperties were different between the mature climax and pioneer trees, even if theirleaves grew under similar light environments at the top canopies.