Artículo

Meinzer, F.C.; Woodruff, D.R.; Domec, J.-C.; Goldstein, G.; Campanello, P.I.; Gatti, M.G.; Villalobos-Vega, R. "Coordination of leaf and stem water transport properties in tropical forest trees" (2008) Oecologia. 156(1):31-41
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Abstract:

Stomatal regulation of transpiration constrains leaf water potential (ΨL) within species-specific ranges that presumably avoid excessive tension and embolism in the stem xylem upstream. However, the hydraulic resistance of leaves can be highly variable over short time scales, uncoupling tension in the xylem of leaves from that in the stems to which they are attached. We evaluated a suite of leaf and stem functional traits governing water relations in individuals of 11 lowland tropical forest tree species to determine the manner in which the traits were coordinated with stem xylem vulnerability to embolism. Stomatal regulation of ΨL was associated with minimum values of water potential in branches (Ψbr) whose functional significance was similar across species. Minimum values of Ψbr coincided with the bulk sapwood tissue osmotic potential at zero turgor derived from pressure-volume curves and with the transition from a linear to exponential increase in xylem embolism with increasing sapwood water deficits. Branch xylem pressure corresponding to 50% loss of hydraulic conductivity (P 50) declined linearly with daily minimum Ψbr in a manner that caused the difference between Ψbr and P 50 to increase from 0.4 MPa in the species with the least negative Ψbr to 1.2 MPa in the species with the most negative Ψbr. Both branch P 50 and minimum Ψbr increased linearly with sapwood capacitance (C) such that the difference between Ψbr and P 50, an estimate of the safety margin for avoiding runaway embolism, decreased with increasing sapwood C. The results implied a trade-off between maximizing water transport and minimizing the risk of xylem embolism, suggesting a prominent role for the buffering effect of C in preserving the integrity of xylem water transport. At the whole-tree level, discharge and recharge of internal C appeared to generate variations in apparent leaf-specific conductance to which stomata respond dynamically. © 2008 Springer-Verlag.

Registro:

Documento: Artículo
Título:Coordination of leaf and stem water transport properties in tropical forest trees
Autor:Meinzer, F.C.; Woodruff, D.R.; Domec, J.-C.; Goldstein, G.; Campanello, P.I.; Gatti, M.G.; Villalobos-Vega, R.
Filiación:USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695, United States
Department of Biology, University of Miami, PO Box 249118, Coral Gables, FL 33124, United States
Laboratorio de Ecología Funcional, Departamento de Ecología, Genética Y Evolución, Pab. II, Buenos Aires C1428EHA, Argentina
Palabras clave:Capacitance; Stomata; Transpiration; Turgor; Xylem vulnerability; water; plant water relations; stomatal conductance; transpiration; transport process; tropical forest; xylem; angiosperm; article; evapotranspiration; Panama; physiology; plant stem; plant stoma; tree; tropic climate; xylem; Angiosperms; Panama; Plant Stems; Plant Stomata; Plant Transpiration; Trees; Tropical Climate; Water; Xylem
Año:2008
Volumen:156
Número:1
Página de inicio:31
Página de fin:41
DOI: http://dx.doi.org/10.1007/s00442-008-0974-5
Título revista:Oecologia
Título revista abreviado:Oecologia
ISSN:00298549
CODEN:OECOB
CAS:water, 7732-18-5; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v156_n1_p31_Meinzer

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Citas:

---------- APA ----------
Meinzer, F.C., Woodruff, D.R., Domec, J.-C., Goldstein, G., Campanello, P.I., Gatti, M.G. & Villalobos-Vega, R. (2008) . Coordination of leaf and stem water transport properties in tropical forest trees. Oecologia, 156(1), 31-41.
http://dx.doi.org/10.1007/s00442-008-0974-5
---------- CHICAGO ----------
Meinzer, F.C., Woodruff, D.R., Domec, J.-C., Goldstein, G., Campanello, P.I., Gatti, M.G., et al. "Coordination of leaf and stem water transport properties in tropical forest trees" . Oecologia 156, no. 1 (2008) : 31-41.
http://dx.doi.org/10.1007/s00442-008-0974-5
---------- MLA ----------
Meinzer, F.C., Woodruff, D.R., Domec, J.-C., Goldstein, G., Campanello, P.I., Gatti, M.G., et al. "Coordination of leaf and stem water transport properties in tropical forest trees" . Oecologia, vol. 156, no. 1, 2008, pp. 31-41.
http://dx.doi.org/10.1007/s00442-008-0974-5
---------- VANCOUVER ----------
Meinzer, F.C., Woodruff, D.R., Domec, J.-C., Goldstein, G., Campanello, P.I., Gatti, M.G., et al. Coordination of leaf and stem water transport properties in tropical forest trees. Oecologia. 2008;156(1):31-41.
http://dx.doi.org/10.1007/s00442-008-0974-5