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Allometry of emergent tree species from saplings to above-canopy adults in a Costa Rican rain forest

Published online by Cambridge University Press:  30 September 2011

David A. King*
Affiliation:
Biological and Ecological Engineering, Oregon State University, Corvallis, OR 97331USA
Deborah A. Clark
Affiliation:
University of Missouri-St. Louis, St Lous, MO 63121–4400USA La Selva Biological Station, Puerto Viejo de Sarapiqui, Costa Rica
*
1Corresponding author. Email dkingaz@yahoo.com

Abstract:

Relations between crown width and tree height and trunk diameter and tree height were measured for trees of all sizes of six large emergent species (Balizia elegans, Dipteryx panamensis, Hieronyma alchorneoides, Hymenolobium mesoamericanum, Lecythis ampla and Terminalia oblonga) in the lowland tropical wet forest at La Selva, Costa Rica. Thirty to 45 individuals were chosen per species to provide a relatively even height distribution from 1 m up to the maximum encountered height. Among small juveniles, the crown widths of the two species with the smallest leaves and horizontally spreading branches were greater than those of the four large-leaved species. On reaching and exceeding the canopy, all but one species showed pronounced increases in crown width with increasing height. These patterns are linked to leaf size and first branching height in small juveniles and low densities of emergent trees at La Selva and other tropical forests, where crown expansion in all directions enhances light interception under the equatorial sun in trees that are not crowded by neighbours of similar height.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2011

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