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UC Irvine Faculty Publications UC Irvine Faculty Publications Title Branch xylem density variations across the Amazon Basin Permalink https://escholarship.org/uc/item/81h2v1g5 Journal Biogeosciences, 6(4) ISSN 1726-4189 Authors Patiño, S. Lloyd, J. Paiva, R. et al. Publication Date 2009-04-08 DOI 10.5194/bg-6-545-2009 Supplemental Material https://escholarship.org/uc/item/81h2v1g5#supplemental License https://creativecommons.org/licenses/by/4.0/ 4.0 Peer reviewed eScholarship.org Powered by the California Digital Library University of California Biogeosciences, 6, 545–568, 2009 www.biogeosciences.net/6/545/2009/ Biogeosciences © Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License. Branch xylem density variations across the Amazon Basin S. Patino˜ 1,2,*, J. Lloyd2, R. Paiva3,**, T. R. Baker2,*, C. A. Quesada2,3, L. M. Mercado4,*, J. Schmerler5,*, † M. Schwarz5,*, A. J. B. Santos6, , A. Aguilar1, C. I.Czimczik7,*, J. Gallo8, V. Horna9,*, E. J. Hoyos10, E. M. Jimenez1, W. Palomino11, J. Peacock2, A. Pena-Cruz˜ 12, C. Sarmiento13, A. Sota5,*, J. D. Turriago8, B. Villanueva8, P. Vitzthum1, E. Alvarez14, L. Arroyo15, C. Baraloto13, D. Bonal13, J. Chave16, A. C. L. Costa17, R. Herrera*, N. Higuchi3, T. Killeen18, E. Leal19, F. Luizao˜ 3, P. Meir20, A. Monteagudo11,12, D. Neil21, P. Nu´nez-Vargas˜ 11, M. C. Penuela˜ 1, N. Pitman22, N. Priante Filho23, A. Prieto24, S. N. Panfil25, A. Rudas26, R. Salomao˜ 19, N.Silva27,28, M. Silveira29, S. Soares deAlmeida19, A. Torres-Lezama30, R. Vasquez-Mart´ ´ınez11, I. Vieira19, Y. Malhi31, and O. L. Phillips2,*** 1Grupo de Ecolog´ıa de Ecosistemas Terrestres Tropicales, Universidad Nacional de Colombia, Sede Amazonia, Instituto Amazonico´ de Investigaciones-Imani, km. 2, v´ıa Tarapaca,´ Leticia, Amazonas, Colombia 2Earth and Biosphere Institute, School of Geography, University of Leeds, LS2 9JT, England, UK 3Institito National de Pesquisas Amazonicas,ˆ Manaus, Brazil 4Centre for Ecology and Hydrology, Wallingford, England, UK 5Fieldwork Assistance, Postfach 101022, 07710 Jena, Germany 6Departamento de Ecologia, Universidade de Bras´ılia, Brazil 7Department of Earth System Science, University of California, Irvine, USA 8Departamento de Biolog´ıa, Universidad Distrital, Bogota,´ Colombia 9Abteilung Okologie¨ und Okosystemforschung,¨ Albrecht-von-Haller-Institut fur¨ Pflanzenwissenschaften, Universitat¨ Gottingen,¨ Gottingen,¨ Germany 10Departamento de Ciencias Forestales, Universidad Nacional de Colombia, Medell´ın, Colombia 11Herbario Vargas, Universidad Nacional San Antonio Abad del Cusco, Cusco, Peru´ 12Proyecto Flora del Peru,´ Jard´ın Botanico´ de Missouri, Oxapampa, Peru´ 13UMR-ECOFOG, INRA, 97310 Kourou, French Guiana 14Equipo de Gestion´ Ambiental, Interconexion´ Electrica´ S.A. ISA., Medell´ın, Colombia 15Museo Noel Kempff Mercado, Santa Cruz, Bolivia 16Lab. Evolution et Diversite’´ Biologique CNRS, Univ. Paul Sabatier Batimentˆ 4R3, 31062, Toulouse cedex 4, France 17Universidade Federal de Para,´ Belem, Brazil 18Center for Applied Biodiversity Science, Conservation International, Washington, DC, USA 19Museu Paraense Emilio Goeldi, Belem, Brazil 20School of Geography, University of Edinburgh, Edinburgh, Scotland, UK 21Herbario Nacional del Ecuador, Quito, Ecuador 22Center for Tropical Conservation, Duke University, Durham, USA 23Universidade Federal do Mato Grosso, Cuiaba, Brazil 24Instituto de Investigacion´ de Recursos Biologicos´ Alexander von Humboldt. Diagonal 27 No. 15-09, Bogota´ D.C, Colombia 25Department of Botany, University of Georgia, Athens, USA 26Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogota,´ Colombia 27CIFOR, Tapajos, Brazil 28EMBRAPA Amazonia Oriental, Belem, Brazil 29Departamento de Cienciasˆ da Natureza, Universidade Federal do Acre, Rio Branco, Brazil 30Facultad de Ciencias Forestales y Ambiental, Universidad de Los Andes, Merida,´ Venezuela 31Oxford University, Centre for the Environment, Oxford, England, United Kingdom † deceased *formerly at: Max-Planck-Institut fur¨ Biogeochemie, Jena, Germany **now at: Secretaria´ Municipal de Desenvolvimento e Meio Ammbiente ma Prefeturia Municipal de Maues,´ Maues,´ Brazil ***Authors are listed according to their contribution to the work. Received: 27 February 2008 – Published in Biogeosciences Discuss.: 9 May 2008 Revised: 3 March 2009 – Accepted: 17 March 2009 – Published: 8 April 2009 Published by Copernicus Publications on behalf of the European Geosciences Union. 546 S. Patino˜ et al.: Amazonian xylem density variation Abstract. Xylem density is a physical property of wood too (Elias and Potvin, 2003). Density, ρ, (the ratio between that varies between individuals, species and environments. oven-dry mass and fresh volume of xylem tissue) is one of It reflects the physiological strategies of trees that lead to the physical properties of wood (Kollmann and Cote,ˆ 1984) growth, survival and reproduction. Measurements of branch and provides an index of the balance between solid mate- xylem density, ρx, were made for 1653 trees represent- rial (i.e. cell wall, parenchyma) and void (i.e. lumen of fi- ing 598 species, sampled from 87 sites across the Amazon bres, tracheids and conductive elements) of the xylem tissue. basin. Measured values ranged from 218 kg m−3 for a Cordia Therefore, changes in wood density are directly associated sagotii (Boraginaceae) from Mountagne de Tortue, French with structural variations at the molecular, cellular and organ Guiana to 1130 kg m−3 for an Aiouea sp. (Lauraceae) from levels. These structural differences are strongly correlated Caxiuana, Central Para,´ Brazil. Analysis of variance showed with the tree’s mechanical properties (Givnish, 1986; Niklas, significant differences in average ρx across regions and sam- 1992; Gartner, 1995), water transport efficiency and safety pled plots as well as significant differences between families, (Hacke et al., 2001; Tyree and Zimmermann, 2002; Jacob- genera and species. A partitioning of the total variance in sen et al., 2005; Holbrook and Zwieniecki, 2005; Pittermann the dataset showed that species identity (family, genera and et al., 2006), rates of carbon exchange (Tyree, 2003; Jacob- species) accounted for 33% with environment (geographic sen et al., 2005; Ishida et al., 2008) and perhaps resistance to location and plot) accounting for an additional 26%; the re- pathogens and herbivores (Rowe and Speck, 2005). Different maining “residual” variance accounted for 41% of the total species from different taxonomic, phylogenetic and architec- variance. Variations in plot means, were, however, not only tural groups show convergence of these functional character- accountable by differences in species composition because istics in response to the environment (Meinzer, 2003). xylem density of the most widely distributed species in our In this work we make the distinction between the density dataset varied systematically from plot to plot. Thus, as well of the wood from the main trunk (here defined as wood den- as having a genetic component, branch xylem density is a sity, ρw) normally measured at 1.3 m from the ground (pos- plastic trait that, for any given species, varies according to sibly including both sapwood and heartwood that may have where the tree is growing in a predictable manner. Within the been air or oven-dried) and that of the sapwood or functional analysed taxa, exceptions to this general rule seem to be pio- xylem of small (ca. 1.5 cm diameter) terminal branches of neer species belonging for example to the Urticaceae whose trees (here defined as xylem density, ρx). Xylem density is branch xylem density is more constrained than most species considered as a potential proxy for tree hydraulic architecture sampled in this study. These patterns of variation of branch (water transport) (Stratton et al., 2000; Gartner and Meinzer, xylem density across Amazonia suggest a large functional 2005; Meinzer et al., 2008). There is evidence supporting the diversity amongst Amazonian trees which is not well under- idea that hydraulic architecture may limit tree performance in stood. terms of transpiration, carbon exchange and growth, (Tyree, 2003; Meinzer et al., 2008). For example, there have been reports showing how ρx scales negatively with leaf 1 Introduction gas exchange and water balance for neotropical forest trees with contrasting phenologies subjected to contrasting rain- Xylem tissue (wood) is a complex organic material com- fall regimes (Santiago et al., 2004; Meinzer et al., 2008), posed of a matrix of hemicelluloses and lignin in which cellu- for neotropical savannah trees (Bucci et al., 2004; Scholz et lose fibrils are embedded (Harada, 1965; Hamad, 2002; Pal- al., 2007), Hawaiian dry forests trees (Stratton et al., 2000) lardy and Kozlowski, 2007). It has a variety of functions in and Californian chaparral species (Pratt et al., 2007). For trees, such as structural support, actuation of the tree itself different environments (California chaparral, South African and of different organs (Niklas, 1992; Fratzl et al., 2008), Mediterranean-type climate, Sonoran desert, Great Basin of long distance transport of water, inorganic ions, organic com- central Utah) and for both gymnosperm and angiosperm trees pounds and proteins from roots to leaves, and storage of wa- and shrubs with distinct xylem structure (ring porous and dif- ter, carbohydrates and fat (Gartner, 1995; Smith and Shortle, fuse porous), ρx scales positively with xylem resistance to 2001; Kehr et al., 2005). Wood also contains the major- cavitation and mechanical
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