Abstract
The objective of this research was to obtain information on species composition and structure of lowland tropical rain forest in Sentarum lake National Park, West Kalimantan. The research was carried out from 26 to 31 December 2003 and from 20 January to 5 February 2004 on the foot slope of Semujan Hill in Sentarum lake National Park. To carry out the research, 10 sample units {SU'S) with size of 10 m x 10 m each, were placed, based on systematic sampling with random start scheme, with distance of 10 m between each SU. On each SU, trees with diameter~ 2 em were identified and diameter {DBH) and height were recorded. Eighty four {84) tree species were found in a 0.1 ha SU, consisting of 32 families, dominated by 16 species of Dipterocarpaceae, followed by 9 species of Guttiferae and 5 species of Melastomataceae. Tree density decreased exponentially with increasing the diameter of trees.
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