Scaling of stem and crown in eight Cecropia (Cecropiaceae) species of Brazil
The scaling of stem and crown was studied in eight Cecropia species in Amazonian and southeastern forests of Brazil. The Amazonian species, C. concolor, C. palmata, C. purpurascens, C. sciadophylla, and C. ulei were studied in Manaus, Amazonas, Brazil. The southeastern species, C. glaziovii, C. holo...
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Published in | American journal of botany Vol. 88; no. 5; pp. 939 - 949 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
United States
Botanical Soc America
01.05.2001
Botanical Society of America Botanical Society of America, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | The scaling of stem and crown was studied in eight Cecropia species in Amazonian and southeastern forests of Brazil. The Amazonian species, C. concolor, C. palmata, C. purpurascens, C. sciadophylla, and C. ulei were studied in Manaus, Amazonas, Brazil. The southeastern species, C. glaziovii, C. hololeuca, and C. pachystachya were studied in Linhares, Espirito Santo, Brazil. Measures of diameter, height, number of branches, number of leaves, and total leaf area were log transformed and regressed on height. Three models of mechanical designs of trees, elastic, constant stress, and geometric similarity, were tested for Cecropia. None of the models can totally describe Cecropia, but geometric similarity was a close approximation. Most of the species did not vary in diameter-height relationships between unbranched and branched individuals. Safety factors diminished with height in most species studied. The crown-height relationships were similar for all species. Numbers of branches and leaves showed some variation among species and are related to height of first branching. Total leaf area had a constant allometric relationship among species, although regression intercepts differed according to species leaf areas. The scaling relationships of stem and crown in Cecropia varied with adult size of the studied species. |
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Bibliography: | Author for correspondence fsantos@unicamp.br The authors thank Reserva Florestal de Linhares, CPAA‐Embrapa, INPA, Fundação Universidade do Amazonas, and their staffs for permission to work in their areas and logistical support; C. Castro and M. Renault for help with field work; A. C. Araujo, E. Fischer, and A. Vicentini for hospitality in Manaus; J. D. Hay for permission to recalculate his data; and A. Ippolito, F. R. Martins, C. M. Jacobi, G. Shepherd, J. E. C. Figueira, W. W. Benson, D. King, and an anonymous reviewer for helpful comments on earlier versions of the manuscript. CAPES provided grant support for TCS. This research was funded by FAEP‐UNICAMP (096/93) and FAPESP (96/4592‐2). . ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0002-9122 1537-2197 |
DOI: | 10.2307/2657047 |