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Abstract:

The impact of nocturnal water loss and recharge of stem water storage on predawn disequilibrium between leaf (ΨL) and soil (ΨS) water potentials was studied in three dominant tropical savanna woody species in central Brazil (Cerrado). Sap flow continued throughout the night during the dry season and contributed from 13 to 28% of total daily transpiration. During the dry season, ΨL was substantially less negative in covered transpiring leaves, throughout the day and night, than in exposed leaves. Before dawn, differences in ΨL between covered and exposed leaves were about 0.4 MPa. When relationships between sap flow and ΨL of exposed leaves were extrapolated to zero flow, the resulting values of ΨL (a proxy of weighted mean soil water potential) in two of the species were similar to predawn values of covered leaves. Consistent with substantial nocturnal sap flow, stomatal conductance (gs) never dropped below 40 mmol m-2 s-1 at night, and in some cases, rose to as much as 100 mmol m-2 s -1 before the end of the dark period. Nocturnal gs decreased linearly with increasing air saturation deficit (D), but there were species-specific differences in the slopes of the relationships between nocturnal gs and D. Withdrawal and recharge of water from stem storage compartments were assessed by monitoring diel fluctuations of stem diameter with electronic dendrometers. Stem water storage compartments tended to recharge faster when nocturnal transpiration was reduced by covering the entire plant. Water potential of covered leaves did not stabilize in any of the plants before the end of the dark period, suggesting that, even in covered plants, water storage tissues were not fully rehydrated by dawn. Patterns of sap flow and expansion and contraction of stems reflected the dynamics of water movement during utilization and recharge of stem water storage tissues. This study showed that nighttime transpiration and recharge of internal water storage contribute to predawn disequilibrium in water potential between leaves and soil in neotropical savanna woody plants.

Registro:

Documento: Artículo
Título:Processes preventing nocturnal equilibration between leaf and soil water potential in tropical savanna woody species
Autor:Bucci, S.J.; Scholz, F.G.; Goldstein, G.; Meinzer, F.C.; Hinojosa, J.A.; Hoffmann, W.A.; Franco, A.C.
Filiación:Department of Biology, University of Miami, P.O. Box 249118, Coral Gables, FL 33124, United States
Lab. de Ecología Funcional, Depto. de Ciencias Biológicas, Ciudad Universitaria, Nuñez, Buenos Aires, Argentina
USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Instituto de Biología, Univ. Catol. de Valparaiso, Av. Brazil 2950, Valparaíso, Chile
Departamento de Engenharia Florestal, Universidade de Brasília, Caixa Postal 04357, Brasília, DF 70919-970, Brazil
Departamento de Botanica, Universidade de Brasília, Caixa Postal 04457, Brasília, DF 70919-970, Brazil
North Carolina State University, Department of Botany, Campus Box 7612, Raleigh, NC 27695, United States
Palabras clave:Capacitance; Nocturnal transpiration; Sap flow; Soil-plant-atmosphere continuum; Stomata; sap flow; soil-vegetation interaction; stomatal conductance; transpiration; woody plant
Año:2004
Volumen:24
Número:10
Página de inicio:1119
Página de fin:1127
DOI: http://dx.doi.org/10.1093/treephys/24.10.1119
Título revista:Tree Physiology
Título revista abreviado:Tree Physiol.
ISSN:0829318X
CODEN:TRPHE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v24_n10_p1119_Bucci

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Citas:

---------- APA ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C., Hinojosa, J.A., Hoffmann, W.A. & Franco, A.C. (2004) . Processes preventing nocturnal equilibration between leaf and soil water potential in tropical savanna woody species. Tree Physiology, 24(10), 1119-1127.
http://dx.doi.org/10.1093/treephys/24.10.1119
---------- CHICAGO ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C., Hinojosa, J.A., Hoffmann, W.A., et al. "Processes preventing nocturnal equilibration between leaf and soil water potential in tropical savanna woody species" . Tree Physiology 24, no. 10 (2004) : 1119-1127.
http://dx.doi.org/10.1093/treephys/24.10.1119
---------- MLA ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C., Hinojosa, J.A., Hoffmann, W.A., et al. "Processes preventing nocturnal equilibration between leaf and soil water potential in tropical savanna woody species" . Tree Physiology, vol. 24, no. 10, 2004, pp. 1119-1127.
http://dx.doi.org/10.1093/treephys/24.10.1119
---------- VANCOUVER ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C., Hinojosa, J.A., Hoffmann, W.A., et al. Processes preventing nocturnal equilibration between leaf and soil water potential in tropical savanna woody species. Tree Physiol. 2004;24(10):1119-1127.
http://dx.doi.org/10.1093/treephys/24.10.1119