期刊
BIOGEOSCIENCES
卷 18, 期 8, 页码 2449-2463出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-18-2449-2021
关键词
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资金
- US Department of Energy, Office of Science, Office of Biological and Environmental Research program [DE-SC0014413, DE-SC0019110]
- National Science Foundation Long-Term Research in Environmental Biology program [DEB-0950080, DEB-1457100, DEB-1557009]
- Smithsonian Institution
- U.S. Department of Energy (DOE) [DE-SC0019110, DE-SC0014413] Funding Source: U.S. Department of Energy (DOE)
Climate warming affects ecosystem carbon cycling, leading to both positive and negative feedbacks on greenhouse gas emissions. A field experiment showed that warming increased methane emissions, with differences observed between plant communities, suggesting that plant composition can modulate wetland responses to climate change.
Climate warming perturbs ecosystem carbon (C) cycling, causing both positive and negative feedbacks on greenhouse gas emissions. In 2016, we began a tidal marsh field experiment in two vegetation communities to investigate the mechanisms by which whole-ecosystem warming alters C gain, via plant-driven sequestration in soils, and C loss, primarily via methane (CH4) emissions. Here, we report the results from the first 4 years. As expected, warming of 5.1 degrees C more than doubled CH4 emissions in both plant communities. We propose this was caused by a combination of four mechanisms: (i) a decrease in the proportion of CH4 consumed by CH4 oxidation, (ii) more C substrates available for methanogenesis, (iii) reduced competition between methanogens and sulfate-reducing bacteria, and (iv) indirect effects of plant traits. Plots dominated by Spartina patens consistently emitted more CH4 than plots dominated by Schoenoplectus americanus, indicating key differences in the roles these common wetland plants play in affecting anaerobic soil biogeochemistry and suggesting that plant composition can modulate coastal wetland responses to climate change.
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