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Abstract:

On a local scale, topography influences microclimate, vegetation structure and the morpho-physiological attributes of plants. We studied the effects of microclimatic differences between NE- and SW-facing slopes on the water relations and hydraulic properties of two dominant shrubs of the Patagonian steppe in Argentina (Retanilla patagonica and Colliguaja integerrima). The NE-facing slope had higher irradiance and air saturation deficits and lower soil water availability and wind speed than the SW-facing slope. Predawn and midday ΨL and osmotic potentials were significantly lower in shrubs on the NE-facing slope. Osmotic adjustment and more elastic cell walls helped the plants to cope with a more xeric environment on NE-facing slope. Higher water deficits on NE-facing slope were partially compensated by a higher leaf and stem water storage. While stem hydraulic efficiency did not vary between slopes, leaf hydraulic conductance was between 40% and 300% higher on the NE-facing slope. Changes observed in leaf size and in SLA were consistent with responses to mechanical forces of wind (smaller and scleromorphic leaves on SW-facing slope). Morpho-physiological adjustments observed at a short spatial scale allow maintenance of midday ΨL above the turgor loss point and demonstrate that leaves are more responsive to microclimatic selective pressures than stems. © 2011.

Registro:

Documento: Artículo
Título:Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate
Autor:Iogna, P.A.; Bucci, S.J.; Scholz, F.G.; Goldstein, G.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
Grupo de Estudios Biofisicos y Ecofisiologicos (GEBEF), Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Argentina
Laboratorio de Ecología Funcional, Departamento de Ecología, Genética y Evolución FCEyN, Universidad de Buenos Aires, Buenos Aires, Argentina
Department of Biology, University of Miami, P.O Box 249118, Coral Gables, FL, United States
Palabras clave:Colliguaja integerrima; Irradiance; Leaf water potential; Retanilla patagonica; Water transport efficiency; Wind; Wood density; adaptation; hydraulic conductivity; irradiance; leaf; microclimate; morphology; osmosis; physiological response; plant water relations; shrub; slope; soil water; spatial analysis; steppe; topographic effect; vegetation structure; wind forcing; Patagonia; Colliguaja integerrima; Retanilla patagonica
Año:2011
Volumen:75
Número:9
Página de inicio:763
Página de fin:772
DOI: http://dx.doi.org/10.1016/j.jaridenv.2011.04.001
Título revista:Journal of Arid Environments
Título revista abreviado:J. Arid Environ.
ISSN:01401963
CODEN:JAEND
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01401963_v75_n9_p763_Iogna

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Citas:

---------- APA ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G. & Goldstein, G. (2011) . Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate. Journal of Arid Environments, 75(9), 763-772.
http://dx.doi.org/10.1016/j.jaridenv.2011.04.001
---------- CHICAGO ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G., Goldstein, G. "Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate" . Journal of Arid Environments 75, no. 9 (2011) : 763-772.
http://dx.doi.org/10.1016/j.jaridenv.2011.04.001
---------- MLA ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G., Goldstein, G. "Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate" . Journal of Arid Environments, vol. 75, no. 9, 2011, pp. 763-772.
http://dx.doi.org/10.1016/j.jaridenv.2011.04.001
---------- VANCOUVER ----------
Iogna, P.A., Bucci, S.J., Scholz, F.G., Goldstein, G. Water relations and hydraulic architecture of two Patagonian steppe shrubs: Effect of slope orientation and microclimate. J. Arid Environ. 2011;75(9):763-772.
http://dx.doi.org/10.1016/j.jaridenv.2011.04.001