Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?

Autores
Villalobos Vega, Randol; Salazar, Ana; Miralles Wilhelm, Fernando; Haridasan, Mundayatan; Franco, Augusto C.; Goldstein, Guillermo Hernan
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Questions: What are the temporal and spatial variations of groundwater depth along topographic gradients in Neotropical savannas? Are patterns of tree density and species diversity along topographic gradients in Neotropical savannas controlled by water table depth? Do soil and groundwater nutrient concentrations differ along topographic gradients in Neotropical savannas? Location: Fire-protected savannas of central Brazil. Methods: Over 16 mo, we monitored temporal and spatial variations in groundwater levels using automated submersible pressure transducers installed in ten wells located along two topographic gradients (five wells per gradient) of 950 m and 1703 m in length, representing elevations of 47 and 37 m a.s.l., respectively. We located the wells according to changes in vegetation physiognomies from woody savannas at high elevations, to open shrubby grasslands at low elevations. Along each topographic gradient we determined soil and groundwater nutrient concentrations as well as richness, density, basal diameter and height of trees within two plots of 14 × 14 m (392 m2) adjacent to each well. Results: Along the two gradients, groundwater levels exhibited larger fluctuations at lower than at higher elevations where the water table was deeper. Richness, density and diversity of trees decreased significantly at lower elevations where soils were waterlogged during the wet season. Soil pH and soil concentrations of carbon, nitrogen and manganese decreased significantly as elevation increased along the topographic gradients, but soil nutrient concentrations of phosphorus, aluminium and iron did not change with elevation. Groundwater samples contained only trace amounts of nutrients and were poorly correlated with elevation along the topographic gradients. Conclusions: In Neotropical savannas, the minimum distance between the soil surface and water table depth (reached during the wet season) and the relatively large fluctuations in groundwater limit tree density and diversity at low elevations as savanna trees cannot cope with extended waterlogging during the wet season and with low soil water availability during the dry season. Thus, variations of tree density and diversity along topographic gradients are more related to spatial and temporal variations in water table depth than to soil and groundwater nutrient variations in Neotropical savannas.
Fil: Villalobos Vega, Randol. University of Technology; Australia
Fil: Salazar, Ana. Miami University; Estados Unidos
Fil: Miralles Wilhelm, Fernando. University of Maryland; Estados Unidos
Fil: Haridasan, Mundayatan. Universidade do Brasília; Brasil
Fil: Franco, Augusto C.. Universidade do Brasília; Brasil
Fil: Goldstein, Guillermo Hernan. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Ecología Funcional; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
HYDROLOGICAL CYCLE
SOIL NUTRIENTS
TOPOGRAPHIC GRADIENTS
TREE COVER
WATER TABLE
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/85390

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oai_identifier_str oai:ri.conicet.gov.ar:11336/85390
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?Villalobos Vega, RandolSalazar, AnaMiralles Wilhelm, FernandoHaridasan, MundayatanFranco, Augusto C.Goldstein, Guillermo HernanHYDROLOGICAL CYCLESOIL NUTRIENTSTOPOGRAPHIC GRADIENTSTREE COVERWATER TABLEhttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1Questions: What are the temporal and spatial variations of groundwater depth along topographic gradients in Neotropical savannas? Are patterns of tree density and species diversity along topographic gradients in Neotropical savannas controlled by water table depth? Do soil and groundwater nutrient concentrations differ along topographic gradients in Neotropical savannas? Location: Fire-protected savannas of central Brazil. Methods: Over 16 mo, we monitored temporal and spatial variations in groundwater levels using automated submersible pressure transducers installed in ten wells located along two topographic gradients (five wells per gradient) of 950 m and 1703 m in length, representing elevations of 47 and 37 m a.s.l., respectively. We located the wells according to changes in vegetation physiognomies from woody savannas at high elevations, to open shrubby grasslands at low elevations. Along each topographic gradient we determined soil and groundwater nutrient concentrations as well as richness, density, basal diameter and height of trees within two plots of 14 × 14 m (392 m2) adjacent to each well. Results: Along the two gradients, groundwater levels exhibited larger fluctuations at lower than at higher elevations where the water table was deeper. Richness, density and diversity of trees decreased significantly at lower elevations where soils were waterlogged during the wet season. Soil pH and soil concentrations of carbon, nitrogen and manganese decreased significantly as elevation increased along the topographic gradients, but soil nutrient concentrations of phosphorus, aluminium and iron did not change with elevation. Groundwater samples contained only trace amounts of nutrients and were poorly correlated with elevation along the topographic gradients. Conclusions: In Neotropical savannas, the minimum distance between the soil surface and water table depth (reached during the wet season) and the relatively large fluctuations in groundwater limit tree density and diversity at low elevations as savanna trees cannot cope with extended waterlogging during the wet season and with low soil water availability during the dry season. Thus, variations of tree density and diversity along topographic gradients are more related to spatial and temporal variations in water table depth than to soil and groundwater nutrient variations in Neotropical savannas.Fil: Villalobos Vega, Randol. University of Technology; AustraliaFil: Salazar, Ana. Miami University; Estados UnidosFil: Miralles Wilhelm, Fernando. University of Maryland; Estados UnidosFil: Haridasan, Mundayatan. Universidade do Brasília; BrasilFil: Franco, Augusto C.. Universidade do Brasília; BrasilFil: Goldstein, Guillermo Hernan. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Ecología Funcional; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaWiley Blackwell Publishing, Inc2014-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/85390Villalobos Vega, Randol; Salazar, Ana; Miralles Wilhelm, Fernando; Haridasan, Mundayatan; Franco, Augusto C.; et al.; Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?; Wiley Blackwell Publishing, Inc; Journal of Vegetation Science; 25; 6; 11-2014; 1465-14731100-9233CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/jvs.12194info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/jvs.12194info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:02:41Zoai:ri.conicet.gov.ar:11336/85390instacron: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 10:02:41.301CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
title Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
spellingShingle Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
Villalobos Vega, Randol
HYDROLOGICAL CYCLE
SOIL NUTRIENTS
TOPOGRAPHIC GRADIENTS
TREE COVER
WATER TABLE
title_short Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
title_full Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
title_fullStr Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
title_full_unstemmed Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
title_sort Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?
dc.creator.none.fl_str_mv Villalobos Vega, Randol
Salazar, Ana
Miralles Wilhelm, Fernando
Haridasan, Mundayatan
Franco, Augusto C.
Goldstein, Guillermo Hernan
author Villalobos Vega, Randol
author_facet Villalobos Vega, Randol
Salazar, Ana
Miralles Wilhelm, Fernando
Haridasan, Mundayatan
Franco, Augusto C.
Goldstein, Guillermo Hernan
author_role author
author2 Salazar, Ana
Miralles Wilhelm, Fernando
Haridasan, Mundayatan
Franco, Augusto C.
Goldstein, Guillermo Hernan
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv HYDROLOGICAL CYCLE
SOIL NUTRIENTS
TOPOGRAPHIC GRADIENTS
TREE COVER
WATER TABLE
topic HYDROLOGICAL CYCLE
SOIL NUTRIENTS
TOPOGRAPHIC GRADIENTS
TREE COVER
WATER TABLE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Questions: What are the temporal and spatial variations of groundwater depth along topographic gradients in Neotropical savannas? Are patterns of tree density and species diversity along topographic gradients in Neotropical savannas controlled by water table depth? Do soil and groundwater nutrient concentrations differ along topographic gradients in Neotropical savannas? Location: Fire-protected savannas of central Brazil. Methods: Over 16 mo, we monitored temporal and spatial variations in groundwater levels using automated submersible pressure transducers installed in ten wells located along two topographic gradients (five wells per gradient) of 950 m and 1703 m in length, representing elevations of 47 and 37 m a.s.l., respectively. We located the wells according to changes in vegetation physiognomies from woody savannas at high elevations, to open shrubby grasslands at low elevations. Along each topographic gradient we determined soil and groundwater nutrient concentrations as well as richness, density, basal diameter and height of trees within two plots of 14 × 14 m (392 m2) adjacent to each well. Results: Along the two gradients, groundwater levels exhibited larger fluctuations at lower than at higher elevations where the water table was deeper. Richness, density and diversity of trees decreased significantly at lower elevations where soils were waterlogged during the wet season. Soil pH and soil concentrations of carbon, nitrogen and manganese decreased significantly as elevation increased along the topographic gradients, but soil nutrient concentrations of phosphorus, aluminium and iron did not change with elevation. Groundwater samples contained only trace amounts of nutrients and were poorly correlated with elevation along the topographic gradients. Conclusions: In Neotropical savannas, the minimum distance between the soil surface and water table depth (reached during the wet season) and the relatively large fluctuations in groundwater limit tree density and diversity at low elevations as savanna trees cannot cope with extended waterlogging during the wet season and with low soil water availability during the dry season. Thus, variations of tree density and diversity along topographic gradients are more related to spatial and temporal variations in water table depth than to soil and groundwater nutrient variations in Neotropical savannas.
Fil: Villalobos Vega, Randol. University of Technology; Australia
Fil: Salazar, Ana. Miami University; Estados Unidos
Fil: Miralles Wilhelm, Fernando. University of Maryland; Estados Unidos
Fil: Haridasan, Mundayatan. Universidade do Brasília; Brasil
Fil: Franco, Augusto C.. Universidade do Brasília; Brasil
Fil: Goldstein, Guillermo Hernan. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Ecología Funcional; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Questions: What are the temporal and spatial variations of groundwater depth along topographic gradients in Neotropical savannas? Are patterns of tree density and species diversity along topographic gradients in Neotropical savannas controlled by water table depth? Do soil and groundwater nutrient concentrations differ along topographic gradients in Neotropical savannas? Location: Fire-protected savannas of central Brazil. Methods: Over 16 mo, we monitored temporal and spatial variations in groundwater levels using automated submersible pressure transducers installed in ten wells located along two topographic gradients (five wells per gradient) of 950 m and 1703 m in length, representing elevations of 47 and 37 m a.s.l., respectively. We located the wells according to changes in vegetation physiognomies from woody savannas at high elevations, to open shrubby grasslands at low elevations. Along each topographic gradient we determined soil and groundwater nutrient concentrations as well as richness, density, basal diameter and height of trees within two plots of 14 × 14 m (392 m2) adjacent to each well. Results: Along the two gradients, groundwater levels exhibited larger fluctuations at lower than at higher elevations where the water table was deeper. Richness, density and diversity of trees decreased significantly at lower elevations where soils were waterlogged during the wet season. Soil pH and soil concentrations of carbon, nitrogen and manganese decreased significantly as elevation increased along the topographic gradients, but soil nutrient concentrations of phosphorus, aluminium and iron did not change with elevation. Groundwater samples contained only trace amounts of nutrients and were poorly correlated with elevation along the topographic gradients. Conclusions: In Neotropical savannas, the minimum distance between the soil surface and water table depth (reached during the wet season) and the relatively large fluctuations in groundwater limit tree density and diversity at low elevations as savanna trees cannot cope with extended waterlogging during the wet season and with low soil water availability during the dry season. Thus, variations of tree density and diversity along topographic gradients are more related to spatial and temporal variations in water table depth than to soil and groundwater nutrient variations in Neotropical savannas.
publishDate 2014
dc.date.none.fl_str_mv 2014-11
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/11336/85390
Villalobos Vega, Randol; Salazar, Ana; Miralles Wilhelm, Fernando; Haridasan, Mundayatan; Franco, Augusto C.; et al.; Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?; Wiley Blackwell Publishing, Inc; Journal of Vegetation Science; 25; 6; 11-2014; 1465-1473
1100-9233
CONICET Digital
CONICET
url http://hdl.handle.net/11336/85390
identifier_str_mv Villalobos Vega, Randol; Salazar, Ana; Miralles Wilhelm, Fernando; Haridasan, Mundayatan; Franco, Augusto C.; et al.; Do groundwater dynamics drive spatial patterns of tree density and diversity in Neotropical savannas?; Wiley Blackwell Publishing, Inc; Journal of Vegetation Science; 25; 6; 11-2014; 1465-1473
1100-9233
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/jvs.12194
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/jvs.12194
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
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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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