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Abstract:

Water availability is a principal factor limiting the distribution of closed-canopy forest in the seasonal tropics, suggesting that forest tree species may not be well adapted to cope with seasonal drought. We studied 11 congeneric species pairs, each containing one forest and one savanna species, to test the hypothesis that forest trees have a lower capacity to maintain seasonal homeostasis in water relations relative to savanna species. To quantify this, we measured sap flow, leaf water potential (Ψ L ), stomatal conductance (g s ), wood density, and Huber value (sapwood area:leaf area) of the 22 study species. We found significant differences in the water relations of these two species types. Leaf area specific hydraulic conductance of the soil/root/leaf pathway (G t ) was greater for savanna species than forest species. The lower G t of forest trees resulted in significantly lower Ψ L and g s in the late dry season relative to savanna trees. The differences in G t can be explained by differences in biomass allocation of savanna and forest trees. Savanna species had higher Huber values relative to forest species, conferring greater transport capacity on a leaf area basis. Forest trees have a lower capacity to maintain homeostasis in Ψ L due to greater allocation to leaf area relative to savanna species. Despite significant differences in water relations, relationships between traits such as wood density and minimum Ψ L were indistinguishable for the two species groups, indicating that forest and savanna share a common axis of water-use strategies involving multiple traits. © 2010 Springer-Verlag.

Registro:

Documento: Artículo
Título:Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees
Autor:Gotsch, S.G.; Geiger, E.L.; Franco, A.C.; Goldstein, G.; Meinzer, F.C.; Hoffmann, W.A.
Filiación:Department of Plant Biology, North Carolina State University, Campus Box 7612, Raleigh, NC 27695-7612, United States
Departamento de Botânica, Universidade de Brasilia, Caixa Postal 04457, Brasilia, DF 70904970, Brazil
Department of Biology, University of Miami, 1301 Memorial Drive, 215, Coral Gables, FL 33124-0421, United States
CONICET-Laboratorio de Ecologia Funcional, Departamento de Genetica Ecologia y Evolucion, Ciudad Universitaria, Buenos Aires, Argentina
USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Palabras clave:Brazil; Cerrado; Huber value; Leaf area index; Sap flow; adaptation; biomass allocation; cerrado; drought; dry season; forest canopy; homeostasis; hydraulic conductivity; hypothesis testing; leaf area index; sap flow; savanna; stomatal conductance; water availability; water relations; Brazil
Año:2010
Volumen:163
Número:2
Página de inicio:291
Página de fin:301
DOI: http://dx.doi.org/10.1007/s00442-009-1543-2
Título revista:Oecologia
Título revista abreviado:Oecologia
ISSN:00298549
CODEN:OECOB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v163_n2_p291_Gotsch

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Citas:

---------- APA ----------
Gotsch, S.G., Geiger, E.L., Franco, A.C., Goldstein, G., Meinzer, F.C. & Hoffmann, W.A. (2010) . Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees. Oecologia, 163(2), 291-301.
http://dx.doi.org/10.1007/s00442-009-1543-2
---------- CHICAGO ----------
Gotsch, S.G., Geiger, E.L., Franco, A.C., Goldstein, G., Meinzer, F.C., Hoffmann, W.A. "Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees" . Oecologia 163, no. 2 (2010) : 291-301.
http://dx.doi.org/10.1007/s00442-009-1543-2
---------- MLA ----------
Gotsch, S.G., Geiger, E.L., Franco, A.C., Goldstein, G., Meinzer, F.C., Hoffmann, W.A. "Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees" . Oecologia, vol. 163, no. 2, 2010, pp. 291-301.
http://dx.doi.org/10.1007/s00442-009-1543-2
---------- VANCOUVER ----------
Gotsch, S.G., Geiger, E.L., Franco, A.C., Goldstein, G., Meinzer, F.C., Hoffmann, W.A. Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees. Oecologia. 2010;163(2):291-301.
http://dx.doi.org/10.1007/s00442-009-1543-2