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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Carbon dioxide and methane emissions from an artificially drained coastal wetland during a flood: Implications for wetland global warming potential
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Carbon dioxide and methane emissions from an artificially drained coastal wetland during a flood: Implications for wetland global warming potential

机译：洪水期间人工排水的沿海湿地的二氧化碳和甲烷排放：对湿地全球变暖潜力的影响

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Floods frequently produce deoxygenation and acidification in waters of artificially drained coastal acid sulfate soil (CASS) wetlands. These conditions are ideal for carbon dioxide and methane production. We investigated CO_2 and CH_4 dynamics and quantified carbon loss within an artificially drained CASS wetland during and after a flood. We separated the system into wetland soils (inundated soil during flood and exposed soil during post flood period), drain water, and creek water and performed measurements of free CO_2 ([CO_2*]), CH_4, dissolved inorganic and organic carbon (DIC and DOC), stable carbon isotopes, and radon (~(222)Rn: natural tracer for groundwater discharge) to determine aquatic carbon loss pathways. [CO_2*] and CH_4 values in the creek reached 721 and 81 μM, respectively, 2 weeks following a flood during a severe deoxygenation phase (dissolved oxygen ~ 0% saturation). CO_2 and CH_4 emissions from the floodplain to the atmosphere were 17-fold and 170-fold higher during the flooded period compared to the post-flood period, respectively. CO_2 emissions accounted for about 90% of total floodplain mass carbon losses during both the flooded and post-flood periods. Assuming a 20 and 100 year global warming potential (GWP) for CH_4 of 105 and 27 CO_2-equivalents, CH_4 emission contributed to 85% and 60% of total floodplain CO_2-equivalent emissions, respectively. Stable carbon isotopes (δ13C in dissolved CO_2 and CH_4) and ~(222)Rn indicated that carbon dynamics within the creek were more likely driven by drainage of surface floodwaters from the CASS wetland rather than groundwater seepage. This study demonstrated that >90% of CO_2 and CH_4 emissions from the wetland system occurred during the flood period and that the inundated wetland was responsible for ~95% of CO_2-equivalent emissions over the floodplain.
机译：洪水经常在人工排水的沿海酸性硫酸盐土壤（CASS）湿地的水中产生脱氧和酸化作用。这些条件非常适合生产二氧化碳和甲烷。我们调查了洪水期间和洪灾后人工排水的CASS湿地内的CO_2和CH_4动态，并定量了碳损失。我们将系统分为湿地土壤（洪水期间淹没的土壤和洪水后时期暴露的土壤），排水和小溪水，并对游离的CO_2（[CO_2 *]），CH_4，溶解的无机和有机碳（DIC和DOC），稳定的碳同位素和（（〜（222）Rn：用于地下水排放的天然示踪剂），以确定水生碳的损失途径。小溪中的[CO_2 *]和CH_4值分别在严重脱氧阶段（溶解氧〜0％饱和）后的两周后达到721和81μM。与洪水后相比，洪水期间从洪泛区向大气的CO_2和CH_4排放分别高出17倍和170倍。在洪水期和洪水后时期，CO_2排放量约占洪泛区总碳损失的90％。假设20年和100年CH_4的全球变暖潜能（GWP）为105和27 CO_2当量，CH_4排放分别占洪泛区总CO_2当量排放的85％和60％。稳定的碳同位素（溶解的CO_2和CH_4中的δ13C）和〜（222）Rn表明，小溪中的碳动力学更有可能是由CASS湿地表层洪水的排水而不是地下水的渗漏驱动的。这项研究表明，湿地系统中超过90％的CO_2和CH_4排放发生在洪水期间，淹没的湿地占整个洪泛区约95％的CO_2当量排放的原因。

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