Journal Article

Constraints on physiological function associated with branch architecture and wood density in tropical forest trees

Frederick C. Meinzer, Paula I. Campanello, Jean-Christophe Domec, M. Genoveva Gatti, Guillermo Goldstein, Randol Villalobos-Vega and David R. Woodruff

in Tree Physiology

Volume 28, issue 11, pages 1609-1617
Published in print September 2008 | ISSN: 0829-318X
Published online September 2008 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/28.11.1609
Constraints on physiological function associated with branch architecture and wood density in tropical forest trees

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This study examined how leaf and stem functional traits related to gas exchange and water balance scale with two potential proxies for tree hydraulic architecture: the leaf area:sapwood area ratio (AL:AS) and wood density (ρw). We studied the upper crowns of individuals of 15 tropical forest tree species at two sites in Panama with contrasting moisture regimes and forest types. Transpiration and maximum photosynthetic electron transport rate (ETRmax) per unit leaf area declined sharply with increasing AL:AS, as did the ratio of ETRmax to leaf N content, an index of photosynthetic nitrogen-use efficiency. Midday leaf water potential, bulk leaf osmotic potential at zero turgor, branch xylem specific conductivity, leaf-specific conductivity and stem and leaf capacitance all declined with increasing ρw. At the branch scale, AL:AS and total leaf N content per unit sapwood area increased with ρw, resulting in a 30% increase in ETRmax per unit sapwood area with a doubling of ρw. These compensatory adjustments in AL:AS, N allocation and potential photosynthetic capacity at the branch level were insufficient to completely offset the increased carbon costs of producing denser wood, and exacerbated the negative impact of increasing ρw on branch hydraulics and leaf water status. The suite of tree functional and architectural traits studied appeared to be constrained by the hydraulic and mechanical consequences of variation in ρw.

Keywords: capacitance; functional convergence; hydraulic architecture; osmotic potential; photosynthesis; transpiration; water potential

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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