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dc.contributor.author
Goldstein, Guillermo Hernan
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dc.contributor.author
Meinzer, Frederick C.
dc.contributor.author
Bucci, Sandra Janet
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dc.contributor.author
Scholz, Fabian Gustavo
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dc.contributor.author
Franco, Augusto C.
dc.contributor.author
Hoffmann, William A.
dc.date.available
2020-02-04T16:23:52Z
dc.date.issued
2008-12
dc.identifier.citation
Goldstein, Guillermo Hernan; Meinzer, Frederick C.; Bucci, Sandra Janet; Scholz, Fabian Gustavo; Franco, Augusto C.; et al.; Water economy of Neotropical savanna trees: Six paradigms revisited; Oxford University Press; Tree Physiology; 28; 3; 12-2008; 395-404
dc.identifier.issn
0829-318X
dc.identifier.uri
http://hdl.handle.net/11336/96684
dc.description.abstract
Biologists have long been puzzled by the striking morphological and anatomical characteristics of Neotropical savanna trees which have large scleromorphic leaves, allocate more than half of their total biomass to belowground structures and produce new leaves during the peak of the dry season. Based on results of ongoing interdisciplinary projects in the savannas of central Brazil (cerrado), we reassessed the validity of six paradigms to account for the water economy of savanna vegetation. (1) All savanna woody species are similar in their ability to take up water from deep soil layers where its availability is relatively constant throughout the year. (2) There is no substantial competition between grasses and trees for water resources during the dry season because grasses exclusively explore upper soil layers, whereas trees access water in deeper soil layers. (3) Tree species have access to abundant groundwater, their stomatal control is weak and they tend to transpire freely. (4) Savanna trees experience increased water deficits during the dry season despite their access to deep soil water. (5) Stomatal conductance of savanna species is low at night to prevent nocturnal transpiration, particularly during the dry season. (6) Savanna tree species can be classified into functional groups according to leaf phenology. We evaluated each paradigm and found differences in the patterns of water uptake between deciduous and evergreen tree species, as well as among evergreen tree species, that have implications for regulation of tree water balance. The absence of resource interactions between herbaceous and woody plants is refuted by our observation that herbaceous plants use water from deep soil layers that is released by deep-rooted trees into the upper soil layer. We obtained evidence of strong stomatal control of transpiration and show that most species exhibit homeostasis in maximum water deficit, with midday water potentials being almost identical in the wet and dry seasons. Although stomatal control is strong during the day, nocturnal transpiration is high during the dry season. Our comparative studies showed that the grouping of species into functional categories is somewhat arbitrary and that ranking species along continuous functional axes better represents the ecological complexity of adaptations of cerrado woody species to their seasonal environment.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
CERRADO
dc.subject
NIGHTTIME TRANSPIRATION
dc.subject
TROPICAL SAVANNAS
dc.subject
WATER DEFICIT
dc.subject
WATER UPTAKE
dc.subject.classification
Ecología
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Water economy of Neotropical savanna trees: Six paradigms revisited
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-12-12T14:50:58Z
dc.identifier.eissn
1758-4469
dc.journal.volume
28
dc.journal.number
3
dc.journal.pagination
395-404
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Oxford
dc.description.fil
Fil: Goldstein, Guillermo Hernan. University of Miami; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina
dc.description.fil
Fil: Meinzer, Frederick C.. USDA Forest Service; Estados Unidos
dc.description.fil
Fil: Bucci, Sandra Janet. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
dc.description.fil
Fil: Scholz, Fabian Gustavo. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
dc.description.fil
Fil: Franco, Augusto C.. Universidade do Brasília; Brasil
dc.description.fil
Fil: Hoffmann, William A.. University of North Carolina; Estados Unidos
dc.journal.title
Tree Physiology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1093/treephys/28.3.395
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/treephys/article/28/3/395/1655260
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