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Media type:
E-Article
Title:
Biogeochemical and plant trait mechanisms drive enhanced methane emissions in response to whole-ecosystem warming
Contributor:
Noyce, Genevieve L.;
Megonigal, J. Patrick
Published:
Copernicus GmbH, 2021
Published in:
Biogeosciences, 18 (2021) 8, Seite 2449-2463
Language:
English
DOI:
10.5194/bg-18-2449-2021
ISSN:
1726-4189
Origination:
Footnote:
Description:
Abstract. Climate warming perturbs ecosystem carbon (C) cycling, causing both positiveand negative feedbacks on greenhouse gas emissions. In 2016, we began atidal marsh field experiment in two vegetation communities to investigatethe mechanisms by which whole-ecosystem warming alters C gain, viaplant-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 ∘C more than doubled CH4emissions in both plant communities. We propose this was caused by acombination of four mechanisms: (i) a decrease in the proportion of CH4consumed by CH4 oxidation, (ii) more C substrates available formethanogenesis, (iii) reduced competition between methanogens and sulfate-reducing bacteria, and (iv) indirect effects of plant traits. Plotsdominated by Spartina patens consistently emitted more CH4 than plots dominated bySchoenoplectus americanus, indicating key differences in the roles these common wetland plants playin affecting anaerobic soil biogeochemistry and suggesting that plantcomposition can modulate coastal wetland responses to climate change.