The Effects of Organic Matter Amendments on Greenhouse Gas Emissions from a Mitigation Wetland in Virginia’s Coastal Plain
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© 2015, Society of Wetland Scientists. There is concern that widespread restoration and/or creation of freshwater wetlands may present a radiative forcing hazard because of the potential for methane (CH 4 ) emissions. Yet data on greenhouse gas (GHG) emissions from restored wetlands are sparse and there has been little investigation into the GHG effects of amending wetland soils with organic matter (OM), a practice used to improve function of mitigation wetlands in the Eastern United States. In this study we measure GHG emissions across an OM gradient at the Charles City Wetland (CCW) in Charles City County, Virginia. We found soils heavily loaded with OM emit significantly more CO 2 than those that have received little or no OM. CH 4 emissions from CCW are low compared to reference wetlands and show no relationship with the loading rate of added OM or total soil carbon. We conclude that adding moderate amounts ( < ~150 kg m −2 ) of OM to the CCW does not greatly increase GHG emissions, while the addition of high amounts of OM produces additional CO 2 , but not CH 4 . CH 4 flux is highest under flooded conditions during warmer months but it still a modest contribution to global warming potential compared to soil CO 2 flux.
Published Version (Please cite this version)10.1007/s13157-015-0674-y
Publication InfoRichardson, Curtis J; & Winton, RS (2015). The Effects of Organic Matter Amendments on Greenhouse Gas Emissions from a Mitigation Wetland in Virginia’s Coastal Plain. Wetlands, 35(5). pp. 969-979. 10.1007/s13157-015-0674-y. Retrieved from https://hdl.handle.net/10161/15704.
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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