Show simple item record

dc.contributor.authorLam, Christina
dc.contributor.authorSlowinski, Stephanie
dc.contributor.authorWillms, N
dc.contributor.authorHug, L
dc.contributor.authorVan Cappellen, Philippe
dc.contributor.authorRezanezhad, Fereidoun 19:22:35 (GMT) 19:22:35 (GMT)
dc.description.abstractLandfills are one of the largest anthropogenic sources of methane (CH4), comprising over 20% of Canada’s CH4 emissions. Hot-spots of CH4 emissions in landfill cover soils have shown an enrichment of microbes that consume CH4 and produce carbon dioxide (CO2) through CH4 oxidation, which can act as a natural solution to reduce CH4 emissions. CH4 oxidation is affected by soil moisture and temperature, although their simultaneous effects on CH4 oxidation rates have not been well-studied. Here, we conducted a closed-headspace batch experiment with cover soil from a former landfill in Waterloo, Ontario, to measure CH4 oxidation and CO2 efflux rates associated with variations in soil moisture and temperature simultaneously. The soil samples were prepared under 5 soil moisture contents (% WFPS; water-filled pore space), ranging from 11 to 47% WFPS, and incubated following a regime whereby temperatures increased from 1 to 35°C (Phase I) then decreased from 35 to 1°C (Phase II). Every 2 days, the temperature was adjusted to the next value for a 24-hour acclimation period while open to the atmosphere, then the headspace was closed and spiked with CH4 (150 ppm). Headspace CH4 and CO2 concentrations were measured over 2 hours to calculate apparent CH4 oxidation and CO2 efflux rates. The maximum CO2 efflux rate was observed at the maximal WFPS and temperature conditions of this experiment (91.5 nmol h-1 g dry wt.-1 at 47% WFPS and 35°C). In contrast, the maximum CH4 oxidation rates were observed at intermediate WFPS and temperature conditions (1.86 nmol h-1 g dry wt.-1 at 25% WFPS and 25°C). These experimental results provide insight into favourable WFPS and temperature conditions for CH4 oxidation, and therefore into how seasonal changes in WFPS and temperature could impact CH4 oxidation.en
dc.description.sponsorshipThis research was undertaken thanks, in part, with support from the Global Water Futures Program funded by the Canada First Research Excellence Fund (CFREF)en
dc.publisherUniversity of Waterlooen
dc.relation.ispartofseriesGlobal Water Futures;
dc.subjectGWF AOSM 2023en
dc.titleLandfill cover soils: variable moisture and temperature effects on methane oxidationen
dc.typeConference Posteren
dcterms.bibliographicCitationLam, C; Slowinski, S; Willms, N; Hug, L; Van Cappellen, P & Rezanezhad, F. (2023). Methane oxidation in landfill cover soils under variable moisture and temperature conditions. Global Water Futures (GWF) Annual Open Science Meeting Conference. University of Waterloo.en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen

Files in this item


This item appears in the following Collection(s)

Show simple item record


University of Waterloo Library
200 University Avenue West
Waterloo, Ontario, Canada N2L 3G1
519 888 4883

All items in UWSpace are protected by copyright, with all rights reserved.

DSpace software

Service outages