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Branch xylem density variations across the Amazon Basin

Patiño, Sandra and Lloyd, Jon and Paiva, R. and Baker, Timothy R. and Quesada, Carlos Alberto and Mercado, L. M. and Schmerler, J. and Schwarz, M. and Santos, A. J. B. and Aguilar, A. and Czimczik, C. I. and Gallo, J. and Horna, V. and Hoyos, E. J. and Jimenez, Eliana and Peacock, J. and Peña-Cruz, A. and Sarmiento, C. and Sota, A. and Turriago, J. D. and Villanueva, B. and Vitzthum, P. and Álvarez Dávila, Esteban and Arroyo, L. and Baraloto, C. and Bonal, D. and Chave, J. and Costa, A. C. L. and Herrera, R. and Higuchi, Niro and Killeen, T. and Leal, E. and Luizâo, F. J. and Meir, P. and Monteagudo, A. and Neil, D. A. and Núñez Vargas, P. and Peñuela, Maria Cristina and Pitman, N. and Priante Filho, N. and Prieto, A. and Panfil, S. N. and Rudas, A. and Salomao, R. and Silva, N. and Silveira, M. and Soares de Almeida, S. and Torres-Lezama, A. and Vasquez-Martınez, R. and Vieira, I. and Malhi, Y. and Phillips, O. L. (2009) Branch xylem density variations across the Amazon Basin. Biogeosciences (6). pp. 545-568. ISSN 17264170

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Xylem density is a physical property of wood that varies between individuals, species and environments. It reflects the physiological strategies of trees that lead to growth, survival and reproduction. Measurements of branch xylem density, -px-, were made for 1653 trees representing 598 species, sampled from 87 sites across the Amazon basin. Measured values ranged from 218 kgm−3 for a Cordia sagotii (Boraginaceae) from Mountagne de Tortue, French Guiana to 1130 kgm−3 for an Aiouea sp. (Lauraceae) from Caxiuana, Central Par´a, Brazil. Analysis of variance showed significant differences in average -px- across regions and sampled plots as well as significant differences between families, genera and species. A partitioning of the total variance in the dataset showed that species identity (family, genera and species) accounted for 33% with environment (geographic location and plot) accounting for an additional 26%; the remaining “residual” variance accounted for 41% of the total variance. Variations in plot means, were, however, not only accountable by differences in species composition because xylem density of the most widely distributed species in our dataset varied systematically from plot to plot. Thus, as well as having a genetic component, branch xylem density is a plastic trait that, for any given species, varies according to where the tree is growing in a predictable manner. Within the analysed taxa, exceptions to this general rule seem to be pioneer species belonging for example to the Urticaceae whose branch xylem density is more constrained than most species sampled in this study. These patterns of variation of branch xylem density across Amazonia suggest a large functional diversity amongst Amazonian trees which is not well understood.

Tipo de documento:Artículo - Article
Palabras clave:Árboles - mediciones; Árboles - Amazonia (Región); Xilema – mediciones
Temática:5 Ciencias naturales y matemáticas / Science > 58 Plantas / Plants
Unidad administrativa:Sede Amazonía > Instituto Amazónico de Investigaciones (IMANI)
Código ID:3694
Enviado por : Biblioteca Sede Amazonia Universidad Nacional de Colombia
Enviado el día :22 Junio 2011 20:06
Ultima modificación:30 Junio 2018 17:22
Ultima modificación:30 Junio 2018 17:22
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