Juvenile height growth rate of seven major tree species in a tropical rain forest of West Sumatra

Mukhtar, Erizal and Koike, Fumito (2009) Juvenile height growth rate of seven major tree species in a tropical rain forest of West Sumatra. Tropics, 18 (1). pp. 1-6.

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Abstract

ABSTRACT Performances of juveniles are a key process for the existence of species in the community. Ef fect of topography, crowding ef fect and forest regeneration cycle, and conspecific plants in the context of Janzen-Connell hypothesis on height growth rate of seven major tree species were evaluated based on measurement of juveniles for nine-year period in a 1-ha plot of a tropical rain forest in West Sumatra, Indonesia. Height growth rate was significantly smaller in Calophyllum soulattri than other six species, and the latter species had approximately equivalent height growth rate. Growth rate was positively correlated with initial height in five species, but was negatively correlated in Calophyllum soulattri . Negative ef fect of conspecific juvenile density was detected by regression analysis only in Calophyllum soulattri . Topography was significant in two species (Hopea dryobalanoides and Mastixia trichotoma). Negative ef fects of total basal area including all species was found in one species (Swintonia schwenkii ). Negative ef fects by conspecific plants was not dominant at least for height growth rate. Calophyllum soulattri was the only exception showing dif ferent behavior from the other species studied. Key Words: Forest regeneration cycle, height growth rate, Janzen-Connell hypothesis, topography, tropical forest

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