Above- and below-ground methane fluxes and methanotrophic activity in a landfill-cover soil |
| |
| Authors: | Schroth M H Eugster W Gómez K E Gonzalez-Gil G Niklaus P A Oester P |
| |
| Institution: | 1. Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Universitätstrasse 16, 8092 Zürich, Switzerland;2. Institute of Agricultural Sciences, ETH Zürich, Universitätstrasse 2, 8092 Zürich, Switzerland;3. Laboratory for Environmental Biotechnology, EPF Lausanne, 1015 Lausanne, Switzerland;4. Oester Messtechnik, Bahnhofstrasse 3, 3600 Thun, Switzerland;1. Environment Agency, Horizon House, Deanery Road, Bristol BS1 5AH, United Kingdom;2. National Physical Laboratory (NPL), Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom;3. Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kongens Lyngby, Denmark;1. Centro de Investigación y de Estudios Avanzados del IPN, Departamento de Biotecnología y Bioingeniería, Av. IPN 2508, México DF, Mexico;2. University of Alaska Fairbanks, Geophysical Institute, 900 Yukon Drive, PO Box 755780, 99775-5780 Fairbanks, USA;1. MOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China;2. Research Center for Air Pollution and Health, Zhejiang University, Hangzhou 310058, China;3. Institute of Environmental Science, Zhejiang University, Hangzhou 310058, China;4. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China;1. Dept of Civil and Environmental Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, FL 32311, USA;2. Ecole Nationale d’Ingénieurs de Gabès, University of Gabès, Rue Omar Ibn-Elkhattab 6029, Gabès, Tunisia;3. LASMAP, Ecole Polytechnique de Tunisie, University of Carthage, B.P. 743, La Marsa 2078, Tunisia;4. Geosyntec Consultants, Columbia, MD 21046, USA;5. Waste Management, Inc., Minneapolis, MN 55337, USA |
| |
| Abstract: | Landfills are a major anthropogenic source of the greenhouse gas methane (CH(4)). However, much of the CH(4) produced during the anaerobic degradation of organic waste is consumed by methanotrophic microorganisms during passage through the landfill-cover soil. On a section of a closed landfill near Liestal, Switzerland, we performed experiments to compare CH(4) fluxes obtained by different methods at or above the cover-soil surface with below-ground fluxes, and to link methanotrophic activity to estimates of CH(4) ingress (loading) from the waste body at selected locations. Fluxes of CH(4) into or out of the cover soil were quantified by eddy-covariance and static flux-chamber measurements. In addition, CH(4) concentrations at the soil surface were monitored using a field-portable FID detector. Near-surface CH(4) fluxes and CH(4) loading were estimated from soil-gas concentration profiles in conjunction with radon measurements, and gas push-pull tests (GPPTs) were performed to quantify rates of microbial CH(4) oxidation. Eddy-covariance measurements yielded by far the largest and probably most representative estimates of overall CH(4) emissions from the test section (daily mean up to ～91,500μmolm(-2)d(-1)), whereas flux-chamber measurements and CH(4) concentration profiles indicated that at the majority of locations the cover soil was a net sink for atmospheric CH(4) (uptake up to -380μmolm(-2)d(-1)) during the experimental period. Methane concentration profiles also indicated strong variability in CH(4) loading over short distances in the cover soil, while potential methanotrophic activity derived from GPPTs was high (v(max)～13mmolL(-1)(soil air)h(-1)) at a location with substantial CH(4) loading. Our results provide a basis to assess spatial and temporal variability of CH(4) dynamics in the complex terrain of a landfill-cover soil. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ |
|
