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Abstract:

The objective of this study was to characterize and understand morphological and physiological variation in traits related to water economy, at the plant and stand level, along a gradient of tree density in a Neotropical savanna (Cerrado). Cerrado plots subjected to long-term fertilization and gallery forests were also included in the analysis to expand the axes of ecosystem variation. Consistent changes in stand level biophysical traits observed along the gradient of increasing tree density included a decrease in weighted-average wood density, and increases in leaf surface area per plant, leaf specific hydraulic conductivity, specific leaf area and stomatal conductance. A conceptual model of biophysical, morphological and physiological trait interactions was developed in an attempt to explain determinants of hy draulic architecture and variations in water economy of Cerrado trees. Consistent with the model minimum leaf water potentials were higher, during the dry season, in low wood density trees compared to high wood density trees, and higher leaf water potential was associated with higher stomatal conductance. On the other hand, variations in stand level physiological and morphological traits along the tree density gradient could not be explained by variations in single environmental factors. Some of the potential contributing factors are: higher concentration and availability of soil nutrients in the upper portion of the gradient where tree density is greatest and constrains to tree establishment and growth by waterlogging and presence of concretions in the soil profile where tree density is lowest.

Registro:

Documento: Artículo
Título:Plant- and stand-level variation in biophysical and physiological traits along tree density gradients in the Cerrado
Autor:Scholz, F.G.; Bucci, S.J.; Goldstein, G.; Meinzer, F.C.; Franco, A.C.; Salazar, A.
Filiación:Departamento de Biologia, Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco, (9000) Comodoro Rivadavia, Argentina
Comisión Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de, Buenos Aires, Argentina
Department of Biology, University of Miami, P.O. Box 249118, Coral Gables, FL 33124, United States
USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Departamento de Botanica, Universidade de Brasília, Caixa Postal 04457, Brasília, DF 70904-970, Brazil
Palabras clave:Gallery forest; Hydraulic architecture; Nutrients; Savannas; Specific leaf area; Wood density
Año:2008
Volumen:20
Número:3
Página de inicio:217
Página de fin:232
Título revista:Brazilian Journal of Plant Physiology
Título revista abreviado:Braz. J. Plant Physiol.
ISSN:16770420
CODEN:BJPPB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16770420_v20_n3_p217_Scholz

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Citas:

---------- APA ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Meinzer, F.C., Franco, A.C. & Salazar, A. (2008) . Plant- and stand-level variation in biophysical and physiological traits along tree density gradients in the Cerrado. Brazilian Journal of Plant Physiology, 20(3), 217-232.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16770420_v20_n3_p217_Scholz [ ]
---------- CHICAGO ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Meinzer, F.C., Franco, A.C., Salazar, A. "Plant- and stand-level variation in biophysical and physiological traits along tree density gradients in the Cerrado" . Brazilian Journal of Plant Physiology 20, no. 3 (2008) : 217-232.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16770420_v20_n3_p217_Scholz [ ]
---------- MLA ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Meinzer, F.C., Franco, A.C., Salazar, A. "Plant- and stand-level variation in biophysical and physiological traits along tree density gradients in the Cerrado" . Brazilian Journal of Plant Physiology, vol. 20, no. 3, 2008, pp. 217-232.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16770420_v20_n3_p217_Scholz [ ]
---------- VANCOUVER ----------
Scholz, F.G., Bucci, S.J., Goldstein, G., Meinzer, F.C., Franco, A.C., Salazar, A. Plant- and stand-level variation in biophysical and physiological traits along tree density gradients in the Cerrado. Braz. J. Plant Physiol. 2008;20(3):217-232.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16770420_v20_n3_p217_Scholz [ ]