文章基本信息

标题：The greenhouse gas flux and potential global warming feedbacks of a northern macrotidal and microtidal salt marsh
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作者：Gail L Chmura ; Lisa Kellman ; Glenn R Guntenspergen 等
期刊名称：Environmental Research Letters
印刷版ISSN：1748-9326
电子版ISSN：1748-9326
出版年度：2011
卷号：6
期号：4
页码：044016-044016
DOI：10.1088/1748-9326/6/4/044016
语种：English
出版社：IOP Publishing Ltd
摘要：Conversion of wetlands by drainage for agriculture or other anthropogenic activities could have a negative or positive feedback to global warming (GWF). We suggest that a major predictor of the GWF is salinity of the wetland soil (a proxy for available sulfate), a factor often ignored in other studies. We assess the radiative balance of two northern salt marshes with average soil salinities > 20 ppt, but with high (macro-) and low (micro-) tidal amplitudes. The flux of greenhouse gases from soils at the end of the growing season averaged 485 ± 253 mg m^{− 2} h^{− 1}, 13 ± 30 µg m^{− 2} h^{− 1}, and 19 ± 58 µg m^{− 2} h^{− 1} in the microtidal marsh and 398 ± 201 mg m^{− 2} h^{− 1}, 2 ± 26 µg m^{− 2} h^{− 1}, and 35 ± 77 µg m^{− 2} h^{− 1} in the macrotidal marsh for CO₂, N₂O, and CH₄, respectively. High rates of C sequestration mean that loss of these marshes would have a radiative balance of − 981 CO₂_eq. m^{− 2} yr^{− 1} in the microtidal and − 567 CO₂_eq. m^{− 2} yr^{− 1} in the macrotidal marsh.