A cost-effective method for reducing soil disturbance-induced errors in static chamber measurement of wetland methane emissions
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© 2015, Springer Science+Business Media Dordrecht. Static chambers used for sampling methane (CH 4 ) in wetlands are highly sensitive to soil disturbance. Temporary compression around chambers during sampling can inflate the initial chamber CH 4 headspace concentration and/or lead to generation of non-linear, unreliable flux estimates that must be discarded. In this study, we tested an often-used rubber gasket (RG)-sealed static chamber against a water-filled gutter (WFG) seal design that could be set up and sampled from a distance of 2 m with a newly designed remote rod sampling system to reduce soil disturbance. Compared to conventional RG design, our remotely sampled static chambers reduced the chance of detecting inflated initial CH 4 concentrations ( > 3.6 ppm) from 66 to 6 % and nearly doubled the proportion of robust linear regressions (r 2 > 0.9) from 45 to 86 %. Importantly, the remote rod sampling system allows for more accurate and reliable CH 4 sampling without costly boardwalk construction. This paper presents results demonstrating that the remote rod sampling system combined with WFG static chambers improves CH 4 data reliability by reducing initial gas measurement variability due to chamber disturbance when tested on a mineral soil-restored wetland in Charles City County, Virginia, USA.
Published Version (Please cite this version)10.1007/s11273-015-9468-5
Publication InfoRichardson, Curtis J; & Winton, RS (2016). A cost-effective method for reducing soil disturbance-induced errors in static chamber measurement of wetland methane emissions. Wetlands Ecology and Management, 24(4). pp. 419-425. 10.1007/s11273-015-9468-5. Retrieved from http://hdl.handle.net/10161/15702.
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John O. Blackburn Professor
Curtis J. Richardson is Professor of Resource Ecology and founding Director of the Duke University Wetland Center in the Nicholas School of the Environment. Dr. Richardson earned his degrees from the State University of New York and the University of Tennessee. His research interests in applied ecology focus on long-term ecosystem response to large-scale perturbations such as climate change, toxic materials, trace metals, flooding, or nutrient additions. He has specific interests in phosphor