Artículo

Scholz, F.G.; Bucci, S.J.; Goldstein, G.; Moreira, M.Z.; Meinzer, F.C.; Domec, J.-C.; Villalobos-Vega, R.; Franco, A.C.; Miralles-Wilhelm, F. "Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees" (2008) Functional Ecology. 22(5):773-786
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Abstract:

1. Ecological and physiological characteristics of vascular plants may facilitate or constrain hydraulic lift. Studies of hydraulic lift typically include only one or few species, but in species-rich ecosystems a larger number of representative species needs to be studied. 2. Measurements of sap flow in tap roots, lateral roots and stems, as well as stable isotope labelling techniques were used to determine the occurrence and relative magnitude of hydraulic lift in several individuals of nine co-occurring Brazilian savanna (Cerrado) tree species differing in life-history traits, and to assess physical and biological determinants of this process at the tree and ecosystem level. 3. The occurrence of reverse sap flow observed in deciduous and brevideciduous species during the dry season was consistent with hydraulic lift. The evergreen species did not exhibit reverse flow. Consistent with their ability to carry out hydraulic lift, the brevideciduous and deciduous species had both shallow and tap roots (dimorphic root systems), whereas the evergreen species had mostly deep roots (monomorphic root systems). 4. In the deciduous and brevideciduous species, the contribution of tap roots to transpiration increased substantially as the dry season progressed. Seasonal changes in the contribution of tap roots to transpiration were not observed in the evergreen species. 5. There was an inverse relationship between rates of reverse sap flow and seasonal loss of hydraulic conductivity in lateral roots, suggesting that hydraulic lift in Cerrado woody plants may help maintain the functionality of the lateral roots in exploring dry and nutrient rich superficial soil layers without directly enhancing the amount of water uptake. 6. Reverse sap flow in lateral roots of the deciduous and brevideciduous species increased asymptotically as the driving force for water movement from roots to the soil increased. This nonlinear relationship implies that additional sinks for water such as nocturnal transpiration and refilling of internal water storage tissues may compete for internal water resources during the dry season. 7. There appears to be a trade-off between greater year-round access to nutrients in the upper soil layers (deciduous and brevideciduous species) and a greater access to deep and more reliable water sources during the dry season (evergreen species), which has implications for whole-ecosystem water, carbon and nutrient balance in Neotropical savannas. © 2008 The Authors.

Registro:

Documento: Artículo
Título:Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees
Autor:Scholz, F.G.; Bucci, S.J.; Goldstein, G.; Moreira, M.Z.; Meinzer, F.C.; Domec, J.-C.; Villalobos-Vega, R.; Franco, A.C.; Miralles-Wilhelm, F.
Filiación:Laboratorio de Ecología Funcional, Departamento de Biología, Universidad Nacional de la Patagonia San Juan Bosco, (9000) Comodoro Rivadavia, Argentina
Comisión Nacional de Investigaciones Científicas Y Técnicas (CONICET), Argentina
Laboratorio de Ecología Funcional, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
Department of Biology, University of Miami, FL, United States
Centro de Energia Nuclear Na Agricultura (CENA), Piracicaba, SP 13416-903, Brazil
USDA Forest Service, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27795, United States
Department of Biology, University of Miami, FL 33124, United States
Departamento de Botanica, Universidade de Brasília, Brasília, DF 70904-970, Brazil
Department of Civil and Environmental Engineering, Florida International University, EC 3680, Miami, FL 33174, United States
Palabras clave:Hydraulic redistribution; Leaf phenology; Nocturnal transpiration; Root architecture; Root conductivity; cerrado; deciduous tree; dry season; evergreen tree; hydraulic conductivity; life history; life history trait; Neotropical region; nutrient budget; phenology; root architecture; sap flow; savanna; seasonal variation; transpiration; vascular plant; water budget; woody plant; Brazil; South America; Tracheophyta
Año:2008
Volumen:22
Número:5
Página de inicio:773
Página de fin:786
DOI: http://dx.doi.org/10.1111/j.1365-2435.2008.01452.x
Título revista:Functional Ecology
Título revista abreviado:Funct. Ecol.
ISSN:02698463
CODEN:FECOE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02698463_v22_n5_p773_Scholz

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Citas:

---------- APA ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Moreira, M.Z., Meinzer, F.C., Domec, J.-C., Villalobos-Vega, R.,..., Miralles-Wilhelm, F. (2008) . Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees. Functional Ecology, 22(5), 773-786.
http://dx.doi.org/10.1111/j.1365-2435.2008.01452.x
---------- CHICAGO ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Moreira, M.Z., Meinzer, F.C., Domec, J.-C., et al. "Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees" . Functional Ecology 22, no. 5 (2008) : 773-786.
http://dx.doi.org/10.1111/j.1365-2435.2008.01452.x
---------- MLA ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Moreira, M.Z., Meinzer, F.C., Domec, J.-C., et al. "Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees" . Functional Ecology, vol. 22, no. 5, 2008, pp. 773-786.
http://dx.doi.org/10.1111/j.1365-2435.2008.01452.x
---------- VANCOUVER ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Moreira, M.Z., Meinzer, F.C., Domec, J.-C., et al. Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees. Funct. Ecol. 2008;22(5):773-786.
http://dx.doi.org/10.1111/j.1365-2435.2008.01452.x