Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient

In the Mediterranean arid region such as Southeast (SE) Spain, a considerable part of the fluvial network runs permanently dry. Here, many dry watercourses are embedded in catchments where agriculture has brought changes in carbon (C) and nitrogen (N) availability due to native riparian vegetation r...

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Autores: Arce, María Isabel, Sánchez-García, María, Martínez-López, Javier, Cayuela, María Luz, Sánchez-Monedero, Miguel Ángel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/339999
Acceso en línea:http://hdl.handle.net/10261/339999
Access Level:acceso abierto
Palabra clave:Greenhouse gas emissions
Nitrate
Denitrification
Drying-rewetting
Dry riverbeds
Campo de Cartagena
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spelling Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradientArce, María IsabelSánchez-García, MaríaMartínez-López, JavierCayuela, María LuzSánchez-Monedero, Miguel ÁngelGreenhouse gas emissionsNitrateDenitrificationDrying-rewettingDry riverbedsCampo de CartagenaIn the Mediterranean arid region such as Southeast (SE) Spain, a considerable part of the fluvial network runs permanently dry. Here, many dry watercourses are embedded in catchments where agriculture has brought changes in carbon (C) and nitrogen (N) availability due to native riparian vegetation removal and the establishment of intensive agriculture. Despite their increasing scientific recognition and vulnerability, our knowledge about dry riverbeds biogeochemistry and environmental drivers is still limited, moreover for developing proper management plans at the whole catchment scale. We examined CO2 and N2O emissions in five riverbeds in SE Spain of variable agricultural impact under dry and simulated rewetted conditions. Sediment denitrifying capacity upon rewetting was also assessed. We found that, regardless of agricultural impact, all riverbeds can emit CO2 under dry and wet conditions. Emissions of N2O were only observed in our study when a long-term rewetting driving saturated sediments was conducted. Besides, most biogeochemical capabilities were enhanced in summer, reflecting the sensitiveness of microbial activity to temperature. Biogeochemical processing variation across rivers appeared to be more controlled by availability of sediment organic C, rather than by agriculturally derived nitrate. We found that the studied dry riverbeds, agriculturally affected or not, may be active sources of CO2 and contribute to transitory N2O emissions during rewetting phenomena, potentially through denitrification. We propose that management plans aiming to support ecosystem biogeochemistry through organic C from native vegetation rather than agricultural exudates would help to reduce anthropogenic greenhouse gases emissions and excess of nutrients in the watershed and to control the nitrate inputs to coastal ecosystemsM.I. Arce was funded by the Spanish Ministry of Economy and Competitiveness through the postdoctoral program Juan de la Cierva -formation (FJCI-2015-26192) and incorporation (IJC 2018-036969-I). J. Martínez-López was funded by a María Zambrano postdoctoral grant by the Spanish Ministry of Universities and Next Generation European Union fundsPeer reviewedElsevierMinisterio de Economía y Competitividad (España)Ministerio de Universidades (España)European CommissionAgencia Estatal de Investigación (España)Cayuela, María Luz [0000-0003-0929-4204]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/339999reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO//FJCI-2015-26192info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 / IJC 2018-036969-IThe underlying dataset has been published as supplementary material of the article in the publisher platform at https://doi.org/10.1016/j.jenvman.2023.117462https://doi.org/10.1016/j.jenvman.2023.117462Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3399992026-05-22T06:33:51Z
dc.title.none.fl_str_mv Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
title Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
spellingShingle Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
Arce, María Isabel
Greenhouse gas emissions
Nitrate
Denitrification
Drying-rewetting
Dry riverbeds
Campo de Cartagena
title_short Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
title_full Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
title_fullStr Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
title_full_unstemmed Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
title_sort Role of dry watercourses of an arid watershed in carbon and nitrogen processing along an agricultural impact gradient
dc.creator.none.fl_str_mv Arce, María Isabel
Sánchez-García, María
Martínez-López, Javier
Cayuela, María Luz
Sánchez-Monedero, Miguel Ángel
author Arce, María Isabel
author_facet Arce, María Isabel
Sánchez-García, María
Martínez-López, Javier
Cayuela, María Luz
Sánchez-Monedero, Miguel Ángel
author_role author
author2 Sánchez-García, María
Martínez-López, Javier
Cayuela, María Luz
Sánchez-Monedero, Miguel Ángel
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Ministerio de Universidades (España)
European Commission
Agencia Estatal de Investigación (España)
Cayuela, María Luz [0000-0003-0929-4204]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Greenhouse gas emissions
Nitrate
Denitrification
Drying-rewetting
Dry riverbeds
Campo de Cartagena
topic Greenhouse gas emissions
Nitrate
Denitrification
Drying-rewetting
Dry riverbeds
Campo de Cartagena
description In the Mediterranean arid region such as Southeast (SE) Spain, a considerable part of the fluvial network runs permanently dry. Here, many dry watercourses are embedded in catchments where agriculture has brought changes in carbon (C) and nitrogen (N) availability due to native riparian vegetation removal and the establishment of intensive agriculture. Despite their increasing scientific recognition and vulnerability, our knowledge about dry riverbeds biogeochemistry and environmental drivers is still limited, moreover for developing proper management plans at the whole catchment scale. We examined CO2 and N2O emissions in five riverbeds in SE Spain of variable agricultural impact under dry and simulated rewetted conditions. Sediment denitrifying capacity upon rewetting was also assessed. We found that, regardless of agricultural impact, all riverbeds can emit CO2 under dry and wet conditions. Emissions of N2O were only observed in our study when a long-term rewetting driving saturated sediments was conducted. Besides, most biogeochemical capabilities were enhanced in summer, reflecting the sensitiveness of microbial activity to temperature. Biogeochemical processing variation across rivers appeared to be more controlled by availability of sediment organic C, rather than by agriculturally derived nitrate. We found that the studied dry riverbeds, agriculturally affected or not, may be active sources of CO2 and contribute to transitory N2O emissions during rewetting phenomena, potentially through denitrification. We propose that management plans aiming to support ecosystem biogeochemistry through organic C from native vegetation rather than agricultural exudates would help to reduce anthropogenic greenhouse gases emissions and excess of nutrients in the watershed and to control the nitrate inputs to coastal ecosystems
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/339999
url http://hdl.handle.net/10261/339999
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO//FJCI-2015-26192
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 / IJC 2018-036969-I
The underlying dataset has been published as supplementary material of the article in the publisher platform at https://doi.org/10.1016/j.jenvman.2023.117462
https://doi.org/10.1016/j.jenvman.2023.117462
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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