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. 2020 Dec 9;70(12):1108–1119. doi: 10.1093/biosci/biaa140

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© The Author(s) 2020. Published by Oxford University Press on behalf of the American Institute of Biological Sciences.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com.

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Figure 4. — Field- and lab-based assessments of the fate of added NO3− in salt marsh sediments. (a) Direct denitrification, coupled denitrification, rhizosphere (rhizo.) associated denitrification and dissimilatory reduction of nitrate to ammonium (DNRA) rates measured on the marsh platform in NO3− enriched and unamended marshes (adapted from Koop-Jakobsen and Giblin 2010). (b) rates of coupled plus direct denitrification and rhizosphere denitrification in cores collected from NO3− and unamended marshes when exposed to comparable supplies of exogenous NO3−.