Long-term study on regeneration process of several tree specieswith special reference to mortality in a tropical rain forest of WestSumatra

Mukhtar, Erizal (2010) Long-term study on regeneration process of several tree specieswith special reference to mortality in a tropical rain forest of WestSumatra. In: Seminar dan Rapat Tahunan BKS-PTN Wilayah Barat ke-21, 10-11 May 2010, Universitas Riau.

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Abstract

Regeneration process of several important tree species in a tropical rainforest,West Sumatra, was evaluated for seven tree species over 20 years period in 1-ha plot of tropical rain forest in Ulu Gadut, West Sumatra Indonesia. Seven- tree species were sampled in 1989, 1999 and 2009. The highest mortality rate of seedling was observed for G. florida and the lowest was observed for ,S. schwenkii At the sapling stage (101-400 cm), the highest mortality rate was also observed for G. florida and the lowest one was observed for H. dryobalanoides. Furthermore, at the pole stage (401-1000 cm), the highest mortality rate was observed for S. schwenkii and the lowest one was observed for C. glandulosus. Species with high mortaiity rates were various between emergent, canopy and subcanopy tree. G. florida and M. trichotoma as subcagopy tree species have performance the higher mortality for seedling, sapling and pole stage. Whereas G forbesii and C. glandulosus also as subcanopy tree species showed lower mortality for seedling, sapling and pole stage. Between canopy tree species C soulottri showed the lowest in mortality rate for seedling, sapling and pole. Furthermore, H. dryobalanoides as canopy tee species perfornance low mortality at sapling and pole stage but higher at seedling stage. On contrary, S. sclnvenkii as emergent tree species have performance low mortalily at seedling stage but high at sapling and pole stage. Key Wcrds : mortality, seedling, sapling, pole, Ulu Gadut, tropical rein forest.

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