Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/3599
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dc.contributor.authorHeinemeyer, Andreasen_UK
dc.contributor.authorWilkinson, Matthewen_UK
dc.contributor.authorVargas, Rodrigoen_UK
dc.contributor.authorSubke, Jens-Arneen_UK
dc.contributor.authorCasella, Ericen_UK
dc.contributor.authorMorison, James I Len_UK
dc.contributor.authorIneson, Philen_UK
dc.date.accessioned2013-06-09T01:06:32Z-
dc.date.available2013-06-09T01:06:32Z-
dc.date.issued2012-01en_UK
dc.identifier.urihttp://hdl.handle.net/1893/3599-
dc.description.abstractQuantifying soil organic carbon stocks (SOC) and their dynamics accurately is crucial for better predictions of climate change feedbacks within the atmosphere-vegetation soil system. However, the components, environmental responses and controls of the soil CO2 efflux (Rs) are still unclear and limited by field data availability. The objectives of this study were (1) to quantify the contribution of the various Rs components, specifically its mycorrhizal component, (2) to determine their temporal variability, and (3) to establish their environmental responses and dependence on gross primary productivity (GPP). In a temperate deciduous oak forest in south east England hourly soil and ecosystem CO2 fluxes over four years were measured using automated soil chambers and eddy covariance techniques. Mesh-bag and steel collar soil chamber treatments prevented root or both root and mycorrhizal hyphal in-growth, respectively, to allow separation of heterotrophic (Rh) and autotrophic (Ra) soil CO2 fluxes and the Ra components, roots (Rr) and mycorrhizal hyphae (Rm). Annual cumulative Rs values were very similar between years (740±43 g Cm−2 yr−1) with an average flux of 2.0±0.3 μmol CO2 m−2 s−1, but Rs components varied. On average, annual Rr, Rm and Rh fluxes contributed 38, 18 and 44 %, respectively, showing a large Ra contribution (56 %) with a considerable Rm component varying seasonally. Soil temperature largely explained the daily variation of Rs (R2 = 0.81), mostly because of strong responses by Rh (R2 = 0.65) and less so for Rr (R2 = 0.41) and Rm (R2 = 0.18). Time series analysis revealed strong daily periodicities for Rs and Rr, whilst Rm was dominated by seasonal ( 150 days), and Rh by annual periodicities. Wavelet coherence analysis revealed that Rr and Rm were related to short-term (daily) GPP changes, but for Rm there was a strong relationship with GPP over much longer (weekly to monthly) periods and notably during periods of low Rr. The need to include individual Rs components in C flux models is discussed, in particular, the need to represent the linkage between GPP and Ra components, in addition to temperature responses for each component. The potential consequences of these findings for understanding the limitations for long-term forest C sequestration are highlighted, as GPP via root-derived C including Rm seems to function as a C “overflow tap”, with implications on the turnover of SOC.en_UK
dc.language.isoenen_UK
dc.publisherCopernicus Publications / European Geosciences Union (EGU)en_UK
dc.relationHeinemeyer A, Wilkinson M, Vargas R, Subke J, Casella E, Morison JIL & Ineson P (2012) Exploring the “overflow tap” theory: linking forest soil CO2 fluxes and individual mycorrhizosphere components to photosynthesis. Biogeosciences, 9 (1), pp. 79-95. www.biogeosciences.net/9/79/2012/; https://doi.org/10.5194/bg-9-79-2012en_UK
dc.rightsHeinemeyer, A., Wilkinson, M., Vargas, R., Subke, J.-A., Casella, E., Morison, J. I. L., and Ineson, P.: Exploring the "overflow tap" theory: linking forest soil CO2 fluxes and individual mycorrhizosphere components to photosynthesis, Biogeosciences, 9, 79-95, doi:10.5194/bg-9-79-2012, 2012. Published in Biogeosciences by Copernicus Publications / European Geosciences Union (EGU).; © Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. http://creativecommons.org/licenses/by/3.0/en_UK
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_UK
dc.subjectSoil CO2 effluxen_UK
dc.subjectheterotrophic respirationen_UK
dc.subjectautotrophic respirationen_UK
dc.subjectectomycorrhizaen_UK
dc.subjectplant productivityen_UK
dc.subjectpartitioningen_UK
dc.subjectAtmospheric carbon dioxide Environmental aspectsen_UK
dc.subjectTrees Effect of atmospheric carbon dioxide onen_UK
dc.subjectPlants Effect of atmospheric carbon dioxide onen_UK
dc.titleExploring the “overflow tap” theory: linking forest soil CO2 fluxes and individual mycorrhizosphere components to photosynthesisen_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.5194/bg-9-79-2012en_UK
dc.citation.jtitleBiogeosciencesen_UK
dc.citation.issn1726-4189en_UK
dc.citation.issn1726-4170en_UK
dc.citation.volume9en_UK
dc.citation.issue1en_UK
dc.citation.spage79en_UK
dc.citation.epage95en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.identifier.urlwww.biogeosciences.net/9/79/2012/en_UK
dc.author.emailjens-arne.subke@stir.ac.uken_UK
dc.contributor.affiliationUniversity of Yorken_UK
dc.contributor.affiliationCentre for Forestry and Climate Changeen_UK
dc.contributor.affiliationCentro de Investigación Científica y de Educación Superior de Ensenada (CICESEen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationCentre for Forestry and Climate Changeen_UK
dc.contributor.affiliationCentre for Forestry and Climate Changeen_UK
dc.contributor.affiliationUniversity of Yorken_UK
dc.identifier.isiWOS:000300229000008en_UK
dc.identifier.scopusid2-s2.0-84856372765en_UK
dc.identifier.wtid834601en_UK
dc.contributor.orcid0000-0001-9244-639Xen_UK
dcterms.dateAccepted2012-01-31en_UK
dc.date.filedepositdate2012-02-02en_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorHeinemeyer, Andreas|en_UK
local.rioxx.authorWilkinson, Matthew|en_UK
local.rioxx.authorVargas, Rodrigo|en_UK
local.rioxx.authorSubke, Jens-Arne|0000-0001-9244-639Xen_UK
local.rioxx.authorCasella, Eric|en_UK
local.rioxx.authorMorison, James I L|en_UK
local.rioxx.authorIneson, Phil|en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2012-02-02en_UK
local.rioxx.licencehttp://creativecommons.org/licenses/by/3.0/|2012-02-02|en_UK
local.rioxx.filenameHeinemeyer et al 2012_BGS.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source1726-4170en_UK
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