Afficher la notice abrégée

Spectral evidence for substrate availability rather than environmental control of methane emissions from a coastal forested wetland

hal.structure.identifierDepartment of Ecosystem Science and Management
dc.contributor.authorMITRA, Bhaskar
hal.structure.identifierDepartment of Forestry and Environmental Resources [North Carolina State University]
dc.contributor.authorMINICK, Kevan
hal.structure.identifierDepartment of Forestry and Environmental Resources
dc.contributor.authorMIAO, Guofang
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDOMEC, Jean-Christophe
hal.structure.identifierTexas A&M University [College Station]
dc.contributor.authorPRAJAPATI, Prajaya
hal.structure.identifierEastern Forest Environmental Threat Assessment Center
dc.contributor.authorMCNULTY, Steve
hal.structure.identifierUnited States Department of Agriculture [USDA]
dc.contributor.authorSUN, Ge
hal.structure.identifierUniversity of Michigan [Ann Arbor]
dc.contributor.authorKING, John
hal.structure.identifierTexas A&M University [College Station]
hal.structure.identifierTexas A&M University [College Station]
dc.contributor.authorNOORMETS, Asko
dc.date.accessioned2024-04-08T11:53:31Z
dc.date.available2024-04-08T11:53:31Z
dc.date.issued2020-09
dc.identifier.issn0168-1923
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195538
dc.description.abstractEnKnowledge of the dynamics of methane (CH4) fluxes across coastal freshwater forested wetlands, such as those found in the southeastern US remains limited. In the current study, we look at the spectral properties of ecosystem net CH4 exchange (NEECH4) time series, and its cospectral behavior with key environmental conditions (temperature (Ts5), water table (WTD) and atmospheric pressure (Pa)) and physiological fluxes (photosynthesis (GPP), transpiration (LE), sap flux (Js)) using data from a natural bottomland hardwood swamp in eastern North Carolina. NEECH4 fluxes were measured over five years (2012 – 2016) that included both wet and dry years. During the growing season, strong cospectral peaks at diurnal scale were detected between CH4 efflux and GPP, LE and Js. This suggests that the well understood diurnal cycles in the latter processes may affect CH4 production through substrate availability (GPP) and transport (sap flow and LE). The causality between different time series was established by the magnitude and consistency of phase shifts. The causal effect of Ts5 and Pa were ruled out because despite cospectral peaks with CH4, their phase relationships were inconsistent. The effect of fluctuations in WTD on CH4 efflux at synoptic scale lacked clear indications of causality, possibly due to time lags and hysteresis. The stronger cospectral peak with ecosystem scale LE rather than Js suggested that the evaporative component of LE contributed equally with plant transpiration. Hence, we conclude that while the emission of dissolved gases through plants likely takes place, it may not contribute to higher CH4 emissions as has been proposed by aerenchymatous gas transport in sedge wetlands. These findings can inform future model development by (i) highlighting the coupling between vegetation processes and CH4 emissions, and (ii) identifying specific and non-overlapping timescales for different driving factors.
dc.language.isoen
dc.publisherElsevier Masson
dc.subject.enCross-scale analysis
dc.subject.enMethane
dc.subject.enPlant transportation
dc.subject.enWavelet analysis
dc.subject.enWater table depth
dc.title.enSpectral evidence for substrate availability rather than environmental control of methane emissions from a coastal forested wetland
dc.typeArticle de revue
dc.identifier.doi10.1016/j.agrformet.2020.108062
dc.subject.halSciences de l'environnement
bordeaux.journalAgricultural and Forest Meteorology
bordeaux.page1-9
bordeaux.volume291
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02918861
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02918861v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Agricultural%20and%20Forest%20Meteorology&rft.date=2020-09&rft.volume=291&rft.spage=1-9&rft.epage=1-9&rft.eissn=0168-1923&rft.issn=0168-1923&rft.au=MITRA,%20Bhaskar&MINICK,%20Kevan&MIAO,%20Guofang&DOMEC,%20Jean-Christophe&PRAJAPATI,%20Prajaya&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée