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Hao, G.-Y.; Hoffmann, W.A.; Scholz, F.G.; Bucci, S.J.; Meinzer, F.C.; Franco, A.C.; Cao, K.-F.; Goldstein, G. "Stem and leaf hydraulics of congeneric tree species from adjacent tropical savanna and forest ecosystems" (2008) Oecologia. 155(3):405-415
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Abstract:

Leaf and stem functional traits related to plant water relations were studied for six congeneric species pairs, each composed of one tree species typical of savanna habitats and another typical of adjacent forest habitats, to determine whether there were intrinsic differences in plant hydraulics between these two functional types. Only individuals growing in savanna habitats were studied. Most stem traits, including wood density, the xylem water potential at 50% loss of hydraulic conductivity, sapwood area specific conductivity, and leaf area specific conductivity did not differ significantly between savanna and forest species. However, maximum leaf hydraulic conductance (Kleaf) and leaf capacitance tended to be higher in savanna species. Predawn leaf water potential and leaf mass per area were also higher in savanna species in all congeneric pairs. Hydraulic vulnerability curves of stems and leaves indicated that leaves were more vulnerable to drought-induced cavitation than terminal branches regardless of genus. The midday Kleaf values estimated from leaf vulnerability curves were very low implying that daily embolism repair may occur in leaves. An electric circuit analog model predicted that, compared to forest species, savanna species took longer for their leaf water potentials to drop from predawn values to values corresponding to 50% loss of Kleaf or to the turgor loss points, suggesting that savanna species were more buffered from changes in leaf water potential. The results of this study suggest that the relative success of savanna over forest species in savanna is related in part to their ability to cope with drought, which is determined more by leaf than by stem hydraulic traits. Variation among genera accounted for a large proportion of the total variance in most traits, which indicates that, despite different selective pressures in savanna and forest habitats, phylogeny has a stronger effect than habitat in determining most hydraulic traits. © 2007 Springer-Verlag.

Registro:

Documento: Artículo
Título:Stem and leaf hydraulics of congeneric tree species from adjacent tropical savanna and forest ecosystems
Autor:Hao, G.-Y.; Hoffmann, W.A.; Scholz, F.G.; Bucci, S.J.; Meinzer, F.C.; Franco, A.C.; Cao, K.-F.; Goldstein, G.
Filiación:Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, 666303 Mengla, Yunnan Province, China
Department of Biology, University of Miami, Coral Gables, FL 33124, United States
Department of Plant Biology, North Carolina State University, Raleigh, NC 27695-7612, United States
Consejo Nacional de Investigaciones Cientificas Y Técnicas (CONICET), Departamento de Biología, Universidad Nacional de la Patagonia San Juan Bosco, 9000 Comodoro Rivadavia, Argentina
USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Departamento de Botanica, Universidade de Brasilia, Caixa Postal 04457, Brasilia, DF 70904970, Brazil
Laboratorio de Ecología Funcional, Departamento de Ciencias Biológicas, Ciudad Universitaria Nuñez, Buenos Aires, Argentina
Palabras clave:Embolism; Phylogenetic inertia; Plant water relations; Vulnerability; forest ecosystem; habitat; hydraulic conductivity; leaf; phylogenetics; phylogeny; plant water relations; savanna; stem
Año:2008
Volumen:155
Número:3
Página de inicio:405
Página de fin:415
DOI: http://dx.doi.org/10.1007/s00442-007-0918-5
Título revista:Oecologia
Título revista abreviado:Oecologia
ISSN:00298549
CODEN:OECOB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v155_n3_p405_Hao

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Citas:

---------- APA ----------
Hao, G.-Y., Hoffmann, W.A., Scholz, F.G., Bucci, S.J., Meinzer, F.C., Franco, A.C., Cao, K.-F.,..., Goldstein, G. (2008) . Stem and leaf hydraulics of congeneric tree species from adjacent tropical savanna and forest ecosystems. Oecologia, 155(3), 405-415.
http://dx.doi.org/10.1007/s00442-007-0918-5
---------- CHICAGO ----------
Hao, G.-Y., Hoffmann, W.A., Scholz, F.G., Bucci, S.J., Meinzer, F.C., Franco, A.C., et al. "Stem and leaf hydraulics of congeneric tree species from adjacent tropical savanna and forest ecosystems" . Oecologia 155, no. 3 (2008) : 405-415.
http://dx.doi.org/10.1007/s00442-007-0918-5
---------- MLA ----------
Hao, G.-Y., Hoffmann, W.A., Scholz, F.G., Bucci, S.J., Meinzer, F.C., Franco, A.C., et al. "Stem and leaf hydraulics of congeneric tree species from adjacent tropical savanna and forest ecosystems" . Oecologia, vol. 155, no. 3, 2008, pp. 405-415.
http://dx.doi.org/10.1007/s00442-007-0918-5
---------- VANCOUVER ----------
Hao, G.-Y., Hoffmann, W.A., Scholz, F.G., Bucci, S.J., Meinzer, F.C., Franco, A.C., et al. Stem and leaf hydraulics of congeneric tree species from adjacent tropical savanna and forest ecosystems. Oecologia. 2008;155(3):405-415.
http://dx.doi.org/10.1007/s00442-007-0918-5