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Microbial mechanisms and ecosystem flux estimation for aerobic NOy emissions from deciduous forest soils
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Mushinski, Ryan , Phillips, Richard P., Payne, Zachary C., Abney, Rebecca B., Jo, Insu, Fei, Songlin, Pusede, Sally E., White, Jeffrey R., Rusch, Douglas B. and Raff, Jonathan D. (2019) Microbial mechanisms and ecosystem flux estimation for aerobic NOy emissions from deciduous forest soils. Proceedings of the National Academy of Sciences of the United States of America, 116 (6). pp. 2138-2145. doi:10.1073/pnas.1814632116 ISSN 0027-8424.
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Official URL: http://dx.doi.org/10.1073/pnas.1814632116
Abstract
Reactive nitrogen oxides (NOy; NOy = NO + NO2 + HONO) decrease air quality and impact radiative forcing, yet the factors responsible for their emission from nonpoint sources (i.e., soils) remain poorly understood. We investigated the factors that control the production of aerobic NOy in forest soils using molecular techniques, process-based assays, and inhibitor experiments. We subsequently used these data to identify hotspots for gas emissions across forests of the eastern United States. Here, we show that nitrogen oxide soil emissions are mediated by microbial community structure (e.g., ammonium oxidizer abundances), soil chemical characteristics (pH and C:N), and nitrogen (N) transformation rates (net nitrification). We find that, while nitrification rates are controlled primarily by chemoautotrophic ammonia-oxidizing archaea (AOA), the production of NOy is mediated in large part by chemoautotrophic ammonia-oxidizing bacteria (AOB). Variation in nitrification rates and nitrogen oxide emissions tracked variation in forest communities, as stands dominated by arbuscular mycorrhizal (AM) trees had greater N transformation rates and NOy fluxes than stands dominated by ectomycorrhizal (ECM) trees. Given mapped distributions of AM and ECM trees from 78,000 forest inventory plots, we estimate that broadleaf forests of the Midwest and the eastern United States as well as the Mississippi River corridor may be considered hotspots of biogenic NOy emissions. Together, our results greatly improve our understanding of NOy fluxes from forests, which should lead to improved predictions about the atmospheric consequences of tree species shifts owing to land management and climate change.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||
Journal or Publication Title: | Proceedings of the National Academy of Sciences of the United States of America | ||||||||
Publisher: | National Academy of Sciences | ||||||||
ISSN: | 0027-8424 | ||||||||
Official Date: | 5 February 2019 | ||||||||
Dates: |
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Volume: | 116 | ||||||||
Number: | 6 | ||||||||
Page Range: | pp. 2138-2145 | ||||||||
DOI: | 10.1073/pnas.1814632116 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) |
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