Water economy of Neotropical savanna trees: Six paradigms revisited
- Autores
- Goldstein, Guillermo Hernan; Meinzer, Frederick C.; Bucci, Sandra Janet; Scholz, Fabian Gustavo; Franco, Augusto C.; Hoffmann, William A.
- Año de publicación
- 2008
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
Fil: Goldstein, Guillermo Hernan. University of Miami; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina
Fil: Meinzer, Frederick C.. USDA Forest Service; Estados Unidos
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
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
Fil: Franco, Augusto C.. Universidade do Brasília; Brasil
Fil: Hoffmann, William A.. University of North Carolina; Estados Unidos - Materia
-
CERRADO
NIGHTTIME TRANSPIRATION
TROPICAL SAVANNAS
WATER DEFICIT
WATER UPTAKE - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/96684
Ver los metadatos del registro completo
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Water economy of Neotropical savanna trees: Six paradigms revisitedGoldstein, Guillermo HernanMeinzer, Frederick C.Bucci, Sandra JanetScholz, Fabian GustavoFranco, Augusto C.Hoffmann, William A.CERRADONIGHTTIME TRANSPIRATIONTROPICAL SAVANNASWATER DEFICITWATER UPTAKEhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Biologists 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.Fil: Goldstein, Guillermo Hernan. University of Miami; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; ArgentinaFil: Meinzer, Frederick C.. USDA Forest Service; Estados UnidosFil: 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; ArgentinaFil: 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; ArgentinaFil: Franco, Augusto C.. Universidade do Brasília; BrasilFil: Hoffmann, William A.. University of North Carolina; Estados UnidosOxford University Press2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/96684Goldstein, 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; 395-4040829-318X1758-4469CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/treephys/28.3.395info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/treephys/article/28/3/395/1655260info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:35:42Zoai:ri.conicet.gov.ar:11336/96684instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:35:42.636CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Water economy of Neotropical savanna trees: Six paradigms revisited |
title |
Water economy of Neotropical savanna trees: Six paradigms revisited |
spellingShingle |
Water economy of Neotropical savanna trees: Six paradigms revisited Goldstein, Guillermo Hernan CERRADO NIGHTTIME TRANSPIRATION TROPICAL SAVANNAS WATER DEFICIT WATER UPTAKE |
title_short |
Water economy of Neotropical savanna trees: Six paradigms revisited |
title_full |
Water economy of Neotropical savanna trees: Six paradigms revisited |
title_fullStr |
Water economy of Neotropical savanna trees: Six paradigms revisited |
title_full_unstemmed |
Water economy of Neotropical savanna trees: Six paradigms revisited |
title_sort |
Water economy of Neotropical savanna trees: Six paradigms revisited |
dc.creator.none.fl_str_mv |
Goldstein, Guillermo Hernan Meinzer, Frederick C. Bucci, Sandra Janet Scholz, Fabian Gustavo Franco, Augusto C. Hoffmann, William A. |
author |
Goldstein, Guillermo Hernan |
author_facet |
Goldstein, Guillermo Hernan Meinzer, Frederick C. Bucci, Sandra Janet Scholz, Fabian Gustavo Franco, Augusto C. Hoffmann, William A. |
author_role |
author |
author2 |
Meinzer, Frederick C. Bucci, Sandra Janet Scholz, Fabian Gustavo Franco, Augusto C. Hoffmann, William A. |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
CERRADO NIGHTTIME TRANSPIRATION TROPICAL SAVANNAS WATER DEFICIT WATER UPTAKE |
topic |
CERRADO NIGHTTIME TRANSPIRATION TROPICAL SAVANNAS WATER DEFICIT WATER UPTAKE |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
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. Fil: Goldstein, Guillermo Hernan. University of Miami; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina Fil: Meinzer, Frederick C.. USDA Forest Service; Estados Unidos 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 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 Fil: Franco, Augusto C.. Universidade do Brasília; Brasil Fil: Hoffmann, William A.. University of North Carolina; Estados Unidos |
description |
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. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-12 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/96684 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 0829-318X 1758-4469 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/96684 |
identifier_str_mv |
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 0829-318X 1758-4469 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1093/treephys/28.3.395 info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/treephys/article/28/3/395/1655260 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Oxford University Press |
publisher.none.fl_str_mv |
Oxford University Press |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613114477150208 |
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13.070432 |