Greenhouse Gas Emissions from a Created Brackish Marsh in Eastern North Carolina

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• 作者：Yo-Jin Shiau ; Michael R. Burchell ; Ken W. Krauss ; Francois Birgand…
• 关键词：Brackish marsh creation ; Greenhouse gas emission ; Carbon dioxide ; Methane ; Carbon sequestration
• 刊名：Wetlands
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：36
• 期：6
• 页码：1009-1024
• 全文大小：
• 刊物主题：Freshwater & Marine Ecology; Environmental Management; Ecology; Hydrogeology; Coastal Sciences; Landscape Ecology;
• 出版者：Springer Netherlands
• ISSN：1943-6246
• 卷排序：36

文摘

Tidal marsh creation helps remediate global warming because tidal wetlands are especially proficient at sequestering carbon (C) in soils. However, greenhouse gas (GHG) losses can offset the climatic benefits gained from C storage depending on how these tidal marshes are constructed and managed. This study attempts to determine the GHG emissions from a 4–6 year old created brackish marsh, what environmental factors governed these emissions, and how the magnitude of the fluxes relates to other wetland ecosystems. The static flux chamber method was used to measure GHG fluxes across three distinct plant zones segregated by elevation. The major of soil GHG fluxes from the marsh were from CO₂ (−48–192 mg C m-2 h-1), although it was near the lower end of values reported from other wetland types having lower salinities, and would mostly be offset by photosynthetic uptake in this created brackish marsh. Methane flux was also low (−0.33–0.86 mg C m-2 h-1), likely inhibited by the high soil SO₄2− and soil redox potentials poised above −150 mV in this in this created brackish marsh environment. Low N₂O flux (−0.11–0.10 mg N m-2 h-1) was due to low soil NO₃− and soil redox conditions favoring complete denitrification. GHG fluxes from this created brackish marsh were generally lower than those recorded from natural marshes, suggesting that C sequestration may not be offset by the radiative forcing from soil GHG emissions if projects are designed properly.