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

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 sp...

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Autores principales: Meinzer, F.C., Campanello, P.I., Domec, J.-C., Gatti, M.G., Goldstein, G., Villalobos-Vega, R., Woodruff, D.R.
Formato: JOUR
Materias:
Capacitance
Functional convergence
Hydraulic architecture
Osmotic potential
Photosynthesis
Transpiration
Water potential
forest canopy
leaf
moisture
osmosis
photosynthesis
tropical forest
wood
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0829318X_v28_n11_p1609_Meinzer
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_0829318X_v28_n11_p1609_Meinzer2023-10-03T15:40:03Z Constraints on physiological function associated with branch architecture and wood density in tropical forest trees Meinzer, F.C. Campanello, P.I. Domec, J.-C. Gatti, M.G. Goldstein, G. Villalobos-Vega, R. Woodruff, D.R. Capacitance Functional convergence Hydraulic architecture Osmotic potential Photosynthesis Transpiration Water potential forest canopy leaf moisture osmosis photosynthesis tropical forest wood 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 ETR max 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. © 2008 Heron Publishing. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0829318X_v28_n11_p1609_Meinzer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Capacitance
Functional convergence
Hydraulic architecture
Osmotic potential
Photosynthesis
Transpiration
Water potential
forest canopy
leaf
moisture
osmosis
photosynthesis
tropical forest
wood
spellingShingle Capacitance
Functional convergence
Hydraulic architecture
Osmotic potential
Photosynthesis
Transpiration
Water potential
forest canopy
leaf
moisture
osmosis
photosynthesis
tropical forest
wood
Meinzer, F.C.
Campanello, P.I.
Domec, J.-C.
Gatti, M.G.
Goldstein, G.
Villalobos-Vega, R.
Woodruff, D.R.
Constraints on physiological function associated with branch architecture and wood density in tropical forest trees
topic_facet Capacitance
Functional convergence
Hydraulic architecture
Osmotic potential
Photosynthesis
Transpiration
Water potential
forest canopy
leaf
moisture
osmosis
photosynthesis
tropical forest
wood
description 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 ETR max 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. © 2008 Heron Publishing.
format JOUR
author Meinzer, F.C.
Campanello, P.I.
Domec, J.-C.
Gatti, M.G.
Goldstein, G.
Villalobos-Vega, R.
Woodruff, D.R.
author_facet Meinzer, F.C.
Campanello, P.I.
Domec, J.-C.
Gatti, M.G.
Goldstein, G.
Villalobos-Vega, R.
Woodruff, D.R.
author_sort Meinzer, F.C.
title Constraints on physiological function associated with branch architecture and wood density in tropical forest trees
title_short Constraints on physiological function associated with branch architecture and wood density in tropical forest trees
title_full Constraints on physiological function associated with branch architecture and wood density in tropical forest trees
title_fullStr Constraints on physiological function associated with branch architecture and wood density in tropical forest trees
title_full_unstemmed Constraints on physiological function associated with branch architecture and wood density in tropical forest trees
title_sort constraints on physiological function associated with branch architecture and wood density in tropical forest trees
url http://hdl.handle.net/20.500.12110/paper_0829318X_v28_n11_p1609_Meinzer
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