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Abstract:

Adaptations of species to capture limiting resources is central for understanding structure and function of ecosystems. We studied the water economy of nine woody species differing in rooting depth in a Patagonian shrub steppe from southern Argentina to understand how soil water availability and rooting depth determine their hydraulic architecture. Soil water content and potentials, leaf water potentials (ΨLeaf), hydraulic conductivity, wood density (ρw), rooting depth, and specific leaf area (SLA) were measured during two summers. Water potentials in the upper soil layers during a summer drought ranged from -2.3 to -3.6 MPa, increasing to -0.05 MPa below 150 cm. Predawn ΨLeaf was used as a surrogate of weighted mean soil water potential because no statistical differences in ΨLeaf were observed between exposed and covered leaves. Species-specific differences in predawn ΨLeaf were consistent with rooting depths. Predawn ΨLeaf ranged from -4.0 MPa for shallow rooted shrubs to -1.0 MPa for deep-rooted shrubs, suggesting that the roots of the latter have access to abundant moisture, whereas shallow-rooted shrubs are adapted to use water deposited mainly by small rainfall events. Wood density was a good predictor of hydraulic conductivity and SLA. Overall, we found that shallow rooted species had efficient water transport in terms of high specific and leaf specific hydraulic conductivity, low ρw, high SLA and a low minimum ΨLeaf that exhibited strong seasonal changes, whereas deeply rooted shrubs maintained similar minimum ΨLeaf throughout the year, had stems with high ρw and low hydraulic conductivity and leaves with low SLA. These two hydraulic syndromes were the extremes of a continuum with several species occupying different portions of a gradient in hydraulic characteristics. It appears that the marginal cost of having an extensive root system (e.g., high ρw and root hydraulic resistance) contributes to low growth rates of the deeply rooted species. © 2009 Springer-Verlag.

Registro:

Documento: Artículo
Título:Soil water availability and rooting depth as determinants of hydraulic architecture of Patagonian woody species
Autor:Bucci, S.J.; Scholz, F.G.; Goldstein, G.; Meinzer, F.C.; Arce, M.E.
Filiación:Comisión Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Departmento de Biología, 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, Universidad de Buenos Aires, Buenos Aires, Argentina
Department of Biology, University of Miami, P. O. Box 249118, Coral Gables, FL, United States
USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Palabras clave:Arid vegetation; Hydraulic conductivity; Leaf water potential; Root depth; Wood density; water; adaptation; arid environment; drought; ecosystem function; growth rate; hydraulic conductivity; leaf area; moisture; precipitation intensity; root system; rooting; seasonal variation; shrub; soil water; steppe; water availability; water economics; water flow; wood; adaptation; Argentina; article; evapotranspiration; growth, development and aging; histology; metabolism; physiology; plant; plant leaf; plant root; soil; species difference; Adaptation, Biological; Argentina; Plant Leaves; Plant Roots; Plant Transpiration; Plants; Soil; Species Specificity; Water; Argentina; South America
Año:2009
Volumen:160
Número:4
Página de inicio:631
Página de fin:641
DOI: http://dx.doi.org/10.1007/s00442-009-1331-z
Título revista:Oecologia
Título revista abreviado:Oecologia
ISSN:00298549
CODEN:OECOB
CAS:water, 7732-18-5; Soil; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v160_n4_p631_Bucci

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Citas:

---------- APA ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C. & Arce, M.E. (2009) . Soil water availability and rooting depth as determinants of hydraulic architecture of Patagonian woody species. Oecologia, 160(4), 631-641.
http://dx.doi.org/10.1007/s00442-009-1331-z
---------- CHICAGO ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C., Arce, M.E. "Soil water availability and rooting depth as determinants of hydraulic architecture of Patagonian woody species" . Oecologia 160, no. 4 (2009) : 631-641.
http://dx.doi.org/10.1007/s00442-009-1331-z
---------- MLA ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C., Arce, M.E. "Soil water availability and rooting depth as determinants of hydraulic architecture of Patagonian woody species" . Oecologia, vol. 160, no. 4, 2009, pp. 631-641.
http://dx.doi.org/10.1007/s00442-009-1331-z
---------- VANCOUVER ----------
Bucci, S.J., Scholz, F.G., Goldstein, G., Meinzer, F.C., Arce, M.E. Soil water availability and rooting depth as determinants of hydraulic architecture of Patagonian woody species. Oecologia. 2009;160(4):631-641.
http://dx.doi.org/10.1007/s00442-009-1331-z