Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems

Autores
Toledo, Santiago; Diaz, Boris Gastón; Duarte Guardia, Sandra; Peri, Pablo Luis
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Wetlands (mallines) of Southern Patagonia are key ecosystems for biodiversity, forage production, and carbon (C) sequestration. However, overgrazing threatens their ecological integrity, causing varying levels of degra­dation that alter soil physical, chemical, and biological properties. The impacts of grazing-induced degradation on soil microbiome function and C dynamics remain poorly understood. This study evaluated soil microbial attributes and C dynamics across eighteen wetlands under light, moderate, and severe degradation along a regional climatic gradient. Measured soil physicochemical and biological properties, such as microbial biomass C and N (MBC, MBN), basal respiration (SBR), microbial efficiency indices (qCO₂, qMC), and estimated both mi­crobial and soil C stocks and CO₂ fluxes. Severe degradation reduced MBC and MBN by up to 46 % and 36 %, respectively, and SBR by 75 %, while increasing bulk density (0.57 to 0.92 g.cm− 3) and reducing nutrient levels (N: 80 %, P: 30 % and K: 35 %). Soil organic carbon (SOC) stocks and associated potential CO₂ removal were 2.5 to 3 times higher in lightly (8.63 and 31.68 kg.m− 2) degraded wetlands compared to moderate (4.52 and 16.59 kg.m− 2) and severe (2.75 and 10.08 kg.m− 2), respectively. Microbial efficiency declined with severe degradation, represented by low qCO₂ (0.13 µg.mg− 1) and high qMC values (1.35 %). Random Forest models identified bulk density, vegetation cover, soil N, and litter as key drivers of microbial and C-related processes. Our findings reveal that degradation alters the functional capacity of soil microbial communities, consequently affecting carbon sequestration. Microbial variables are early bioindicators of soil functional integrity. Integrating micro­bial and soil physicochemical parameters into monitoring frameworks can help detect early degradation and guide sustainable land-use strategies for wetland ecosystems.
Fil: Toledo, Santiago. Instituto Nacional de Tecnología Agropecuaria; Argentina
Fil: Diaz, Boris Gastón. Instituto Nacional de Tecnología Agropecuaria; Argentina. Universidad Nacional de la Patagonia Austral; Argentina
Fil: Duarte Guardia, Sandra. Universidad Cientifica del Sur;
Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Santa Cruz. Universidad Tecnológica Nacional. Facultad Regional Santa Cruz. Centro de Investigaciones y Transferencia de Santa Cruz. Universidad Nacional de la Patagonia Austral. Centro de Investigaciones y Transferencia de Santa Cruz; Argentina
Materia
Soil functionality
Grazing pressure
Carbon sequestration
Ecosystem functioning
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/276102
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/276102
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystemsToledo, SantiagoDiaz, Boris GastónDuarte Guardia, SandraPeri, Pablo LuisSoil functionalityGrazing pressureCarbon sequestrationEcosystem functioninghttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Wetlands (mallines) of Southern Patagonia are key ecosystems for biodiversity, forage production, and carbon (C) sequestration. However, overgrazing threatens their ecological integrity, causing varying levels of degra­dation that alter soil physical, chemical, and biological properties. The impacts of grazing-induced degradation on soil microbiome function and C dynamics remain poorly understood. This study evaluated soil microbial attributes and C dynamics across eighteen wetlands under light, moderate, and severe degradation along a regional climatic gradient. Measured soil physicochemical and biological properties, such as microbial biomass C and N (MBC, MBN), basal respiration (SBR), microbial efficiency indices (qCO₂, qMC), and estimated both mi­crobial and soil C stocks and CO₂ fluxes. Severe degradation reduced MBC and MBN by up to 46 % and 36 %, respectively, and SBR by 75 %, while increasing bulk density (0.57 to 0.92 g.cm− 3) and reducing nutrient levels (N: 80 %, P: 30 % and K: 35 %). Soil organic carbon (SOC) stocks and associated potential CO₂ removal were 2.5 to 3 times higher in lightly (8.63 and 31.68 kg.m− 2) degraded wetlands compared to moderate (4.52 and 16.59 kg.m− 2) and severe (2.75 and 10.08 kg.m− 2), respectively. Microbial efficiency declined with severe degradation, represented by low qCO₂ (0.13 µg.mg− 1) and high qMC values (1.35 %). Random Forest models identified bulk density, vegetation cover, soil N, and litter as key drivers of microbial and C-related processes. Our findings reveal that degradation alters the functional capacity of soil microbial communities, consequently affecting carbon sequestration. Microbial variables are early bioindicators of soil functional integrity. Integrating micro­bial and soil physicochemical parameters into monitoring frameworks can help detect early degradation and guide sustainable land-use strategies for wetland ecosystems.Fil: Toledo, Santiago. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Diaz, Boris Gastón. Instituto Nacional de Tecnología Agropecuaria; Argentina. Universidad Nacional de la Patagonia Austral; ArgentinaFil: Duarte Guardia, Sandra. Universidad Cientifica del Sur;Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Santa Cruz. Universidad Tecnológica Nacional. Facultad Regional Santa Cruz. Centro de Investigaciones y Transferencia de Santa Cruz. Universidad Nacional de la Patagonia Austral. Centro de Investigaciones y Transferencia de Santa Cruz; ArgentinaElsevier2025-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/276102Toledo, Santiago; Diaz, Boris Gastón; Duarte Guardia, Sandra; Peri, Pablo Luis; Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems; Elsevier; Total Environment Microbiology; 1; 4; 10-2025; 1-113050-6417CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S3050641725000412info:eu-repo/semantics/altIdentifier/doi/10.1016/j.temicr.2025.100041info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-12-23T13:57:49Zoai:ri.conicet.gov.ar:11336/276102instacron: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:34982025-12-23 13:57:49.468CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
title Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
spellingShingle Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
Toledo, Santiago
Soil functionality
Grazing pressure
Carbon sequestration
Ecosystem functioning
title_short Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
title_full Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
title_fullStr Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
title_full_unstemmed Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
title_sort Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems
dc.creator.none.fl_str_mv Toledo, Santiago
Diaz, Boris Gastón
Duarte Guardia, Sandra
Peri, Pablo Luis
author Toledo, Santiago
author_facet Toledo, Santiago
Diaz, Boris Gastón
Duarte Guardia, Sandra
Peri, Pablo Luis
author_role author
author2 Diaz, Boris Gastón
Duarte Guardia, Sandra
Peri, Pablo Luis
author2_role author
author
author
dc.subject.none.fl_str_mv Soil functionality
Grazing pressure
Carbon sequestration
Ecosystem functioning
topic Soil functionality
Grazing pressure
Carbon sequestration
Ecosystem functioning
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Wetlands (mallines) of Southern Patagonia are key ecosystems for biodiversity, forage production, and carbon (C) sequestration. However, overgrazing threatens their ecological integrity, causing varying levels of degra­dation that alter soil physical, chemical, and biological properties. The impacts of grazing-induced degradation on soil microbiome function and C dynamics remain poorly understood. This study evaluated soil microbial attributes and C dynamics across eighteen wetlands under light, moderate, and severe degradation along a regional climatic gradient. Measured soil physicochemical and biological properties, such as microbial biomass C and N (MBC, MBN), basal respiration (SBR), microbial efficiency indices (qCO₂, qMC), and estimated both mi­crobial and soil C stocks and CO₂ fluxes. Severe degradation reduced MBC and MBN by up to 46 % and 36 %, respectively, and SBR by 75 %, while increasing bulk density (0.57 to 0.92 g.cm− 3) and reducing nutrient levels (N: 80 %, P: 30 % and K: 35 %). Soil organic carbon (SOC) stocks and associated potential CO₂ removal were 2.5 to 3 times higher in lightly (8.63 and 31.68 kg.m− 2) degraded wetlands compared to moderate (4.52 and 16.59 kg.m− 2) and severe (2.75 and 10.08 kg.m− 2), respectively. Microbial efficiency declined with severe degradation, represented by low qCO₂ (0.13 µg.mg− 1) and high qMC values (1.35 %). Random Forest models identified bulk density, vegetation cover, soil N, and litter as key drivers of microbial and C-related processes. Our findings reveal that degradation alters the functional capacity of soil microbial communities, consequently affecting carbon sequestration. Microbial variables are early bioindicators of soil functional integrity. Integrating micro­bial and soil physicochemical parameters into monitoring frameworks can help detect early degradation and guide sustainable land-use strategies for wetland ecosystems.
Fil: Toledo, Santiago. Instituto Nacional de Tecnología Agropecuaria; Argentina
Fil: Diaz, Boris Gastón. Instituto Nacional de Tecnología Agropecuaria; Argentina. Universidad Nacional de la Patagonia Austral; Argentina
Fil: Duarte Guardia, Sandra. Universidad Cientifica del Sur;
Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Santa Cruz. Universidad Tecnológica Nacional. Facultad Regional Santa Cruz. Centro de Investigaciones y Transferencia de Santa Cruz. Universidad Nacional de la Patagonia Austral. Centro de Investigaciones y Transferencia de Santa Cruz; Argentina
description Wetlands (mallines) of Southern Patagonia are key ecosystems for biodiversity, forage production, and carbon (C) sequestration. However, overgrazing threatens their ecological integrity, causing varying levels of degra­dation that alter soil physical, chemical, and biological properties. The impacts of grazing-induced degradation on soil microbiome function and C dynamics remain poorly understood. This study evaluated soil microbial attributes and C dynamics across eighteen wetlands under light, moderate, and severe degradation along a regional climatic gradient. Measured soil physicochemical and biological properties, such as microbial biomass C and N (MBC, MBN), basal respiration (SBR), microbial efficiency indices (qCO₂, qMC), and estimated both mi­crobial and soil C stocks and CO₂ fluxes. Severe degradation reduced MBC and MBN by up to 46 % and 36 %, respectively, and SBR by 75 %, while increasing bulk density (0.57 to 0.92 g.cm− 3) and reducing nutrient levels (N: 80 %, P: 30 % and K: 35 %). Soil organic carbon (SOC) stocks and associated potential CO₂ removal were 2.5 to 3 times higher in lightly (8.63 and 31.68 kg.m− 2) degraded wetlands compared to moderate (4.52 and 16.59 kg.m− 2) and severe (2.75 and 10.08 kg.m− 2), respectively. Microbial efficiency declined with severe degradation, represented by low qCO₂ (0.13 µg.mg− 1) and high qMC values (1.35 %). Random Forest models identified bulk density, vegetation cover, soil N, and litter as key drivers of microbial and C-related processes. Our findings reveal that degradation alters the functional capacity of soil microbial communities, consequently affecting carbon sequestration. Microbial variables are early bioindicators of soil functional integrity. Integrating micro­bial and soil physicochemical parameters into monitoring frameworks can help detect early degradation and guide sustainable land-use strategies for wetland ecosystems.
publishDate 2025
dc.date.none.fl_str_mv 2025-10
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/11336/276102
Toledo, Santiago; Diaz, Boris Gastón; Duarte Guardia, Sandra; Peri, Pablo Luis; Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems; Elsevier; Total Environment Microbiology; 1; 4; 10-2025; 1-11
3050-6417
CONICET Digital
CONICET
url http://hdl.handle.net/11336/276102
identifier_str_mv Toledo, Santiago; Diaz, Boris Gastón; Duarte Guardia, Sandra; Peri, Pablo Luis; Degradation of soil microbiome and carbon dynamics in response to overgrazing in Austral wetland ecosystems; Elsevier; Total Environment Microbiology; 1; 4; 10-2025; 1-11
3050-6417
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S3050641725000412
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.temicr.2025.100041
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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score 12.952241

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