Seasonal variation in methane oxidation in a landfill cover soil as determined by an in situ stable isotope technique

  • Chanton J
  • Liptay K
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Abstract

Seasonavlariationisn theoxidationof methandeuringitstransporatcrossthesoilcap ofalandfillinLeonCountyF,lorida,weredetermineidnsituwithastableisotopictechnique. Theapproachontrastethdefi•3CvaluesofemittedandanoxiczoneCH4andutilizedmeasure- mentsof theisotopicfractionatiofnactorix,whichvariedinverselywithtemperaturferom 1.025 to1.049.AnoxiczoneCH4didnotvaryseasonalalyndhadafi•3Caveragvealueof -55.18+ 0.15%oM.ethanemittedfromthelandfillsoilsurfaceandcaptureidnchambersangedin from -54%0in winter,whenemissionrateswerehigh,to -40%oin summer,whenemissionrates werelower.Theantipathetviacriatiobnetweetnhefi•3CofemitteCdH4andtherateofCH4emis- sionisconsistenwtithcontroolftheemissionratebybacteriaolxidation.Ourinterpretatioonf theisotopedataindicatesthatmethaneoxidationconsumedfrom3 to 5% of thetotalflux in win- ter to a maximum of 43 + 10% in summer. There was variation in the extent of methane oxidation insoiltypes,withmulch/topsoailveraging55+ 14%andclayaveraging33+ 13%insummer. The seasonallyintegratedvaluefor methaneoxidationfor areasof thelandfill coveredwith mulch/topsowilas26+4%ofthefluxtowardthesoilsurfacew,hileforclaysoilitwasonly14+ 2%. Theoverallannuaalveragew,hichincludesbothtypesofsoil,was20-23_%.Coveringland- fillswithadditionamlulch,whichcanbegeneratedfromyardwaste,mayattenuatemethane emissionby providinga loosenoncompacstubstratefor bacterialattachmenatndanenvironment withmoisturem,ethanea,ndoxygen.Atspecificsiteswithinthelandfillwestudiedt,emperature wasthemain factorcontrollingmethaneoxidation.

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Authors

  • Jeffrey Chanton

  • Karen Liptay

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