Tree allometry and crown shape of four tree species in Atlantic rain forest, south-east Brazil

The allometry of crown shape and trunk diameter with tree height were analysed for four tree species in a tropical lowland rain forest, southeast Brazil. The dimensional relationships of a subcanopy species (Garcinia gardneriana) were contrasted with those of two canopy (Chrysophyllum flexuosum and...

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Vydáno v:	Journal of tropical ecology Ročník 18; číslo 2; s. 245 - 260
Hlavní autoři:	Alves, Luciana F., Santos, Flavio A. M.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Cambridge, UK Cambridge University Press 01.03.2002
Témata:	Allometry Animal and plant ecology Animal, plant and microbial ecology Autoecology Biological and medical sciences Brazil Canopies Crown rump length Forest canopy Forest ecology Forest trees Fundamental and applied biological sciences. Psychology mechanical stability Plant ecology Plant species Plants and fungi Rain Rainforests tree allometry Tree crowns Tree trunks Trees tropical lowland rain forest Tropical rain forests tropical tree species South America Brazil America Brazil tropical tree species tropical lowland rain forest tree allometry mechanical stability Trunk Statistical analysis Elaeocarpaceae Growth Guttiferae Interspecific comparison Tropical rain forest Sapotaceae Allometry Leguminosae Dicotyledones Angiospermae Tree crown Tree Spermatophyta Lowland Diameter
ISSN:	0266-4674, 1469-7831
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Shrnutí:	The allometry of crown shape and trunk diameter with tree height were analysed for four tree species in a tropical lowland rain forest, southeast Brazil. The dimensional relationships of a subcanopy species (Garcinia gardneriana) were contrasted with those of two canopy (Chrysophyllum flexuosum and Swartzia simplex) and one emergent species (Sloanea guianensis). For all trees ≥ 1 cm dbh, we recorded dbh, total height, branching height, crown area, crown width and crown length. Observed allometric relationships indicated interspecific variation in trunk diameter and crown shape with height. All species conformed to the elastic similarity model, except the emergent one that showed thicker trunks and a scaling exponent conforming to the constant stress model. The general allometric function used to describe the overall relationship (all sizes combined) did not specify exceptional variation in crown shape between species of contrasting adult stature (emergent vs. subcanopy species). However, when allometric relationships through ontogeny were considered, different strategies of growth, maintenance and expansion of crown became evident. Crown shapes were much more variable in canopy and emergent species than in the subcanopy one, suggesting that larger-statured species might be more flexible in the relative allocation of energy to height, diameter, and crown growth than smaller-statured ones. Notwithstanding, it is suggested that it is not possible adequately to predict allometric relationships only by adult stature/canopy position. Allometric variation may be also related to size-dependent changes in demographic traits and/or different responses to light availability among tree species.
Bibliografie:	istex:CB8F67CCD118425622CFA458A9CB8D865C68BBB2 ark:/67375/6GQ-12JCMRMJ-9 PII:S026646740200216X SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-2 content type line 23
ISSN:	0266-4674 1469-7831
DOI:	10.1017/S026646740200216X