Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa

[1] Autotrophic and heterotrophic components of soil CO2 efflux may have differential responses to environmental factors, so estimating the relative contribution of each component during summer precipitation pulses is essential to predict C balance in soils experiencing regular drought conditions. A...

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Autores: Casals i Tortras, Pere, 1963-, Lopez-Sangil, Luis, Carrara, Arnaud, Gimeno, Cristina, Nogués Mestres, Salvador
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/198126
Acceso en línea:https://hdl.handle.net/2445/198126
Access Level:acceso abierto
Palabra clave:Sòls
Diòxid de carboni
Mediterrània (Regió)
Deveses
Soils
Carbon dioxide
Mediterranean Region
Meadows
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spelling Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesaCasals i Tortras, Pere, 1963-Lopez-Sangil, LuisCarrara, ArnaudGimeno, CristinaNogués Mestres, SalvadorSòlsDiòxid de carboniMediterrània (Regió)DevesesSoilsCarbon dioxideMediterranean RegionMeadows[1] Autotrophic and heterotrophic components of soil CO2 efflux may have differential responses to environmental factors, so estimating the relative contribution of each component during summer precipitation pulses is essential to predict C balance in soils experiencing regular drought conditions. As even small summer rains induced high instantaneous soil respiration rates in Mediterranean wooded grasslands, we hypothesized that standing dead mass, surface litter, and topsoil layer could play a dominant role in the initial flush of CO2 produced immediately after soil rewetting; in contrast, soil CO2 effluxes during drought periods should be mostly derived from tree root activity. In a grazed dehesa, we simulated four summer rain events and measured soil CO2 efflux discontinuously, estimating its δ13C through a Keeling plot nonsteady state static chamber approach. In addition, we estimated litter contribution to soil CO2 efflux and extracted soil available C fractions (K2SO4-extracted C and chloroform-fumigated extracted C). The δ13C-CO2 from in-tube incubated excised tree roots and rewetted root-free soil was −25.0 (±0.2) and −28.4 (±0.2), respectively. Assuming those values as end-members' sources, the autotrophic component of soil CO2 efflux was dominant during the severe drought, whereas the heterotrophic contribution dominated from the very beginning of precipitation pulses. As standing dead mass and fresh litter contribution was low (<25%) in the first day and negligible after, we concluded that CO2 efflux after rewetting was mostly derived from microbial mineralization of available soil organic C fractions.Wiley2023202320112023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion12 p.application/pdfhttps://hdl.handle.net/2445/198126Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1029/2010GB003973Global Biogeochemical Cycles, 2011, vol. 25, num. 3, p. 3012https://doi.org/10.1029/2010GB003973(c) American Geophysical Union, 2011info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1981262026-05-29T05:05:01Z
dc.title.none.fl_str_mv Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
title Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
spellingShingle Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
Casals i Tortras, Pere, 1963-
Sòls
Diòxid de carboni
Mediterrània (Regió)
Deveses
Soils
Carbon dioxide
Mediterranean Region
Meadows
title_short Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
title_full Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
title_fullStr Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
title_full_unstemmed Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
title_sort Autotrophyc and heterotrophic contributions to short-term soil CO2 efflux following simulated summer precipitation pulses in a mediterranean dehesa
dc.creator.none.fl_str_mv Casals i Tortras, Pere, 1963-
Lopez-Sangil, Luis
Carrara, Arnaud
Gimeno, Cristina
Nogués Mestres, Salvador
author Casals i Tortras, Pere, 1963-
author_facet Casals i Tortras, Pere, 1963-
Lopez-Sangil, Luis
Carrara, Arnaud
Gimeno, Cristina
Nogués Mestres, Salvador
author_role author
author2 Lopez-Sangil, Luis
Carrara, Arnaud
Gimeno, Cristina
Nogués Mestres, Salvador
author2_role author
author
author
author
dc.subject.none.fl_str_mv Sòls
Diòxid de carboni
Mediterrània (Regió)
Deveses
Soils
Carbon dioxide
Mediterranean Region
Meadows
topic Sòls
Diòxid de carboni
Mediterrània (Regió)
Deveses
Soils
Carbon dioxide
Mediterranean Region
Meadows
description [1] Autotrophic and heterotrophic components of soil CO2 efflux may have differential responses to environmental factors, so estimating the relative contribution of each component during summer precipitation pulses is essential to predict C balance in soils experiencing regular drought conditions. As even small summer rains induced high instantaneous soil respiration rates in Mediterranean wooded grasslands, we hypothesized that standing dead mass, surface litter, and topsoil layer could play a dominant role in the initial flush of CO2 produced immediately after soil rewetting; in contrast, soil CO2 effluxes during drought periods should be mostly derived from tree root activity. In a grazed dehesa, we simulated four summer rain events and measured soil CO2 efflux discontinuously, estimating its δ13C through a Keeling plot nonsteady state static chamber approach. In addition, we estimated litter contribution to soil CO2 efflux and extracted soil available C fractions (K2SO4-extracted C and chloroform-fumigated extracted C). The δ13C-CO2 from in-tube incubated excised tree roots and rewetted root-free soil was −25.0 (±0.2) and −28.4 (±0.2), respectively. Assuming those values as end-members' sources, the autotrophic component of soil CO2 efflux was dominant during the severe drought, whereas the heterotrophic contribution dominated from the very beginning of precipitation pulses. As standing dead mass and fresh litter contribution was low (<25%) in the first day and negligible after, we concluded that CO2 efflux after rewetting was mostly derived from microbial mineralization of available soil organic C fractions.
publishDate 2011
dc.date.none.fl_str_mv 2011
2023
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/198126
url https://hdl.handle.net/2445/198126
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1029/2010GB003973
Global Biogeochemical Cycles, 2011, vol. 25, num. 3, p. 3012
https://doi.org/10.1029/2010GB003973
dc.rights.none.fl_str_mv (c) American Geophysical Union, 2011
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Geophysical Union, 2011
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 12 p.
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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