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| Titel |
Branch xylem density variations across the Amazon Basin |
| VerfasserIn |
S. Patiño, J. Lloyd, R. Paiva, T. R. Baker, C. A. Quesada, L. M. Mercado, J. Schmerler, M. Schwarz, A. J. B. Santos, A. Aguilar, C. I. Czimczik, J. Gallo, V. Horna, E. J. Hoyos, E. M. Jimenez, W. Palomino, J. Peacock, A. Peña-Cruz, C. Sarmiento, A. Sota, J. D. Turriago, B. Villanueva, P. Vitzthum, E. Álvarez, L. Arroyo, C. Baraloto, D. Bonal, J. Chave, A. C. L. Costa, R. Herrera, N. Higuchi, T. Killeen, E. Leal, F. Luizão, P. Meir, A. Monteagudo, D. Neil, P. Núñez-Vargas, M. C. Peñuela, N. Pitman, N. Priante Filho, A. Prieto, S. N. Panfil, A. Rudas, R. Salomão, N. Silva, M. Silveira, S. Soares de Almeida, A. Torres-Lezama, R. Vásquez-Martínez, I. Vieira, Y. Malhi, O. L. Phillips |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 4 ; Nr. 6, no. 4 (2009-04-08), S.545-568 |
| Datensatznummer |
250003638
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| Publikation (Nr.) |
 copernicus.org/bg-6-545-2009.pdf |
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| Zusammenfassung |
| 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, ρx, were made for 1653 trees
representing 598 species, sampled from 87 sites across the Amazon basin.
Measured values ranged from 218 kg m−3 for a Cordia sagotii (Boraginaceae) from
Mountagne de Tortue, French Guiana to 1130 kg m−3 for an Aiouea sp. (Lauraceae)
from Caxiuana, Central Pará, Brazil. Analysis of variance showed
significant differences in average ρx 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. |
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