Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects

Autores
Ambrosino, Mariela Lis; Montecchia, Marcela Susana; Torres, Yanina Alejandra; Ithurrart, Leticia Soledad; Lucero, Cinthia Tamara; Busso, Carlos Alberto
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Natural grasslands are an important renewable resource for livestock production. Grazing in these areas alters the plant community composition, litter quality, and soil microbial structure and activity. Three cool-season species were studied in a semiarid rangeland area of Argentina: Poa ligularis and Nassella tenuis (desirable/ preferred for livestock) and Amelichloa ambigua (undesirable/non preferred). The objective was to analyze the effect of moderate defoliation and plant species on the structure and activity of soil microbial communities associated with their roots. In winter 2012, soil samples (0–10 cm) were taken underneath marked plant canopies of the three species (n = 8). Immediately thereafter, half of the plants (n = 4) were defoliated (5 cm stubble height) and the other half remained undefoliated (controls). The defoliation treatment was conducted again in the spring. Soil samples were taken 30 days after each defoliation event. The study was repeated in 2013, using a different plant set. Bacterial community structure and soil microbial activity were analyzed using PCR-DGGE analysis and basal soil respiration, respectively. Moderate and early defoliations allowed compensatory growth in the defoliated plants. Variations in the soil genetic profiles of A. ambigua suggest a higher dependence on its rhizospheric bacterial communities. Defoliation treatments did not substantially affect basal soil respiration but showed strong links between desirable species and soil microbial activity. Sustainable management practices that promote the persistence of these species are important for the development of microbial communities that respond quickly to stress conditions, favoring decomposition processes that maintain soil fertility in semiarid grasslands.
Materia
Agronomía, reproducción y protección de plantas
Poa ligularis
Nassella tenuis
Amelichloa ambigua
Natural grassland
Forage quality
Rhizosphere
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
CIC Digital (CICBA)
Institución
Comisión de Investigaciones Científicas de la Provincia de Buenos Aires
OAI Identificador
oai:digital.cic.gba.gob.ar:11746/11217

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repository_id_str 9441
network_name_str CIC Digital (CICBA)
spelling Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effectsAmbrosino, Mariela LisMontecchia, Marcela SusanaTorres, Yanina AlejandraIthurrart, Leticia SoledadLucero, Cinthia TamaraBusso, Carlos AlbertoAgronomía, reproducción y protección de plantasPoa ligularisNassella tenuisAmelichloa ambiguaNatural grasslandForage qualityRhizosphereNatural grasslands are an important renewable resource for livestock production. Grazing in these areas alters the plant community composition, litter quality, and soil microbial structure and activity. Three cool-season species were studied in a semiarid rangeland area of Argentina: Poa ligularis and Nassella tenuis (desirable/ preferred for livestock) and Amelichloa ambigua (undesirable/non preferred). The objective was to analyze the effect of moderate defoliation and plant species on the structure and activity of soil microbial communities associated with their roots. In winter 2012, soil samples (0–10 cm) were taken underneath marked plant canopies of the three species (n = 8). Immediately thereafter, half of the plants (n = 4) were defoliated (5 cm stubble height) and the other half remained undefoliated (controls). The defoliation treatment was conducted again in the spring. Soil samples were taken 30 days after each defoliation event. The study was repeated in 2013, using a different plant set. Bacterial community structure and soil microbial activity were analyzed using PCR-DGGE analysis and basal soil respiration, respectively. Moderate and early defoliations allowed compensatory growth in the defoliated plants. Variations in the soil genetic profiles of A. ambigua suggest a higher dependence on its rhizospheric bacterial communities. Defoliation treatments did not substantially affect basal soil respiration but showed strong links between desirable species and soil microbial activity. Sustainable management practices that promote the persistence of these species are important for the development of microbial communities that respond quickly to stress conditions, favoring decomposition processes that maintain soil fertility in semiarid grasslands.2021-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttps://digital.cic.gba.gob.ar/handle/11746/11217enginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.rhisph.2021.100382info:eu-repo/semantics/altIdentifier/issn/2452-2198info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/reponame:CIC Digital (CICBA)instname:Comisión de Investigaciones Científicas de la Provincia de Buenos Airesinstacron:CICBA2025-09-29T13:40:09Zoai:digital.cic.gba.gob.ar:11746/11217Institucionalhttp://digital.cic.gba.gob.arOrganismo científico-tecnológicoNo correspondehttp://digital.cic.gba.gob.ar/oai/snrdmarisa.degiusti@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:94412025-09-29 13:40:09.991CIC Digital (CICBA) - Comisión de Investigaciones Científicas de la Provincia de Buenos Airesfalse
dc.title.none.fl_str_mv Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
title Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
spellingShingle Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
Ambrosino, Mariela Lis
Agronomía, reproducción y protección de plantas
Poa ligularis
Nassella tenuis
Amelichloa ambigua
Natural grassland
Forage quality
Rhizosphere
title_short Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
title_full Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
title_fullStr Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
title_full_unstemmed Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
title_sort Soil microbial structure and activity in a semiarid rangeland of Patagonia, Argentina: Plant species and defoliation effects
dc.creator.none.fl_str_mv Ambrosino, Mariela Lis
Montecchia, Marcela Susana
Torres, Yanina Alejandra
Ithurrart, Leticia Soledad
Lucero, Cinthia Tamara
Busso, Carlos Alberto
author Ambrosino, Mariela Lis
author_facet Ambrosino, Mariela Lis
Montecchia, Marcela Susana
Torres, Yanina Alejandra
Ithurrart, Leticia Soledad
Lucero, Cinthia Tamara
Busso, Carlos Alberto
author_role author
author2 Montecchia, Marcela Susana
Torres, Yanina Alejandra
Ithurrart, Leticia Soledad
Lucero, Cinthia Tamara
Busso, Carlos Alberto
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Agronomía, reproducción y protección de plantas
Poa ligularis
Nassella tenuis
Amelichloa ambigua
Natural grassland
Forage quality
Rhizosphere
topic Agronomía, reproducción y protección de plantas
Poa ligularis
Nassella tenuis
Amelichloa ambigua
Natural grassland
Forage quality
Rhizosphere
dc.description.none.fl_txt_mv Natural grasslands are an important renewable resource for livestock production. Grazing in these areas alters the plant community composition, litter quality, and soil microbial structure and activity. Three cool-season species were studied in a semiarid rangeland area of Argentina: Poa ligularis and Nassella tenuis (desirable/ preferred for livestock) and Amelichloa ambigua (undesirable/non preferred). The objective was to analyze the effect of moderate defoliation and plant species on the structure and activity of soil microbial communities associated with their roots. In winter 2012, soil samples (0–10 cm) were taken underneath marked plant canopies of the three species (n = 8). Immediately thereafter, half of the plants (n = 4) were defoliated (5 cm stubble height) and the other half remained undefoliated (controls). The defoliation treatment was conducted again in the spring. Soil samples were taken 30 days after each defoliation event. The study was repeated in 2013, using a different plant set. Bacterial community structure and soil microbial activity were analyzed using PCR-DGGE analysis and basal soil respiration, respectively. Moderate and early defoliations allowed compensatory growth in the defoliated plants. Variations in the soil genetic profiles of A. ambigua suggest a higher dependence on its rhizospheric bacterial communities. Defoliation treatments did not substantially affect basal soil respiration but showed strong links between desirable species and soil microbial activity. Sustainable management practices that promote the persistence of these species are important for the development of microbial communities that respond quickly to stress conditions, favoring decomposition processes that maintain soil fertility in semiarid grasslands.
description Natural grasslands are an important renewable resource for livestock production. Grazing in these areas alters the plant community composition, litter quality, and soil microbial structure and activity. Three cool-season species were studied in a semiarid rangeland area of Argentina: Poa ligularis and Nassella tenuis (desirable/ preferred for livestock) and Amelichloa ambigua (undesirable/non preferred). The objective was to analyze the effect of moderate defoliation and plant species on the structure and activity of soil microbial communities associated with their roots. In winter 2012, soil samples (0–10 cm) were taken underneath marked plant canopies of the three species (n = 8). Immediately thereafter, half of the plants (n = 4) were defoliated (5 cm stubble height) and the other half remained undefoliated (controls). The defoliation treatment was conducted again in the spring. Soil samples were taken 30 days after each defoliation event. The study was repeated in 2013, using a different plant set. Bacterial community structure and soil microbial activity were analyzed using PCR-DGGE analysis and basal soil respiration, respectively. Moderate and early defoliations allowed compensatory growth in the defoliated plants. Variations in the soil genetic profiles of A. ambigua suggest a higher dependence on its rhizospheric bacterial communities. Defoliation treatments did not substantially affect basal soil respiration but showed strong links between desirable species and soil microbial activity. Sustainable management practices that promote the persistence of these species are important for the development of microbial communities that respond quickly to stress conditions, favoring decomposition processes that maintain soil fertility in semiarid grasslands.
publishDate 2021
dc.date.none.fl_str_mv 2021-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://digital.cic.gba.gob.ar/handle/11746/11217
url https://digital.cic.gba.gob.ar/handle/11746/11217
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.rhisph.2021.100382
info:eu-repo/semantics/altIdentifier/issn/2452-2198
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