AOBPreview originally published online on January 6, 2006
Annals of Botany 2006 97(4):559-569; doi:10.1093/aob/mcl003
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Responses of Crown Development to Canopy Openings by Saplings of Eight Tropical Submontane Forest Tree Species in Indonesia: A Comparison with Cool-temperate Trees
1 Department of Biology, Faculty of Science, Shinshu University, Asahi 3-1-1, Matsumoto 390-8621, Japan and 2 Center for Research and Development in Biology, Indonesian Institute of Sciences, JL Juanda 22, Bogor 16122, Indonesia
* For correspondence. E-mail koichit{at}gipac.shinshu-u.ac.jp
Received: 12 August 2005 Returned for revision: 15 November 2005 Accepted: 6 December 2005 Published electronically: 6 January 2006
• Background and Aims Growth in trunk height in canopy openings is important for saplings. How saplings increase height growth in canopy openings may relate to crown architectural constraints. Responses of crown development to canopy openings in relation to trunk height growth were studied for saplings (0·2–2·5 m tall) of eight tropical submontane forest tree species in Indonesia. The results of this study were also compared with those of temperate trees in northern Japan.
• Methods The crown architecture differed among the eight tropical species, i.e. they had sparsely to highly developed branching structures. Crown allometry was compared among the eight species in each canopy condition (closed canopy or canopy openings), and between closed canopy and canopy openings within a species. A general linear regression model was used to analyse how each species increases height growth rate in canopy openings. Crown allometry and its plasticity were compared between tropical and temperate trees by a nested analysis of covariance.
• Key Results Tropical submontane trees had responses similar to cool-temperate trees, showing an increase in height in canopy openings, i.e. taller saplings of sparsely branched species increase height growth rates by increasing the sapling leaf area. Cool-temperate trees have a wider crown projection area and a smaller leaf area per crown projection area to avoid self-shading within a crown compared with tropical submontane trees. Plasticity of the crown projection area is greater in cool-temperate trees than in tropical submontane trees, probably because of the difference in leaf longevity.
• Conclusions This study concluded that interspecific variation in the responses of crown development to canopy openings in regard to increasing height related to the species' branching structure, and that different life-forms, such as evergreen and deciduous trees, had different crown allometry and plasticity.
Key words: Cool-temperate trees, crown allometry, crown architecture, height growth, Indonesia, saplings, plasticity, tropical trees
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