@article{8988af4accda406b81c9faf6faf5ec8a,
title = "Isotopic Composition of In Situ Soil NOx Emissions in Manure-Fertilized Cropland",
abstract = "Soil emissions represent ~25% of the global annual atmospheric budget of nitrogen oxides (NOx). The nitrogen isotopic composition of soil NOx emissions (δ15N-NOx) is potentially useful to track soil emission contributions to NOx budgets, yet its in situ variations with fertilizer management and meteorology are unknown. We quantify in situ δ15N-NOx distributions from liquid dairy manure-fertilized cropland in State College, Pennsylvania at hourly resolution during spring 2016 and 2017. δ15N-NOx (n = 37) ranged from −44.2 to −14.0‰ and was distinct between injected (−32.2 ± 12.1‰) and broadcast manure without tillage (−23.4 ± 2.1‰). δ15N-NOx was not correlated with order of magnitude emission variations due to large changes in soil moisture. δ15N-NOx differences between treatments were associated with nitrification and NO consumption contributions. Our results suggest that δ15N-NOx can be a valuable observational tracer of soil emissions and varies with fertilizer management practices.",
author = "Miller, {David J.} and Jiajue Chai and Felix Guo and Dell, {Curtis J.} and Heather Karsten and Hastings, {Meredith G.}",
note = "Funding Information: We are grateful for the guidance of Ruby Ho, Wendell Walters, Rebecca Ryals, and David Murray; Emad Jahanzad and the Penn State University sustainable dairy cropping study team for support and field site access; Sarah Fishel for laboratory space at USDA-ARS; and Brooke Osborne for KCl extraction methods support. This work was funded by U.S. Department of Agriculture National Institute of Food and Agriculture Postdoctoral Fellowship award 2016-67012-24707 to D. J. M. and National Science Foundation CAREER award AGS-1351932 to M.G.H. Data in this study are available on the Brown University Digital Repository at https://doi.org/10.7301/Z06W98K7, and USDA NRCS Rock Springs, PA, site data are available at https://wcc.sc.egov.usda.gov/nwcc/site?sitenum=2036. Funding Information: We are grateful for the guidance of Ruby Ho, Wendell Walters, Rebecca Ryals, and David Murray; Emad Jahanzad and the Penn State University sustainable dairy cropping study team for support and field site access; Sarah Fishel for laboratory space at USDA-ARS; and Brooke Osborne for KCl extraction methods support. This work was funded by U.S. Department of Agriculture National Institute of Food and Agriculture Postdoctoral Fellowship award 2016-67012-24707 to D. J. M. and National Science Foundation CAREER award AGS-1351932 to M.G.H. Data in this study are available on the Brown University Digital Repository at https:// doi.org/10.7301/Z06W98K7, and USDA NRCS Rock Springs, PA, site data are available at https://wcc.sc.egov.usda. gov/nwcc/site?sitenum=2036. Publisher Copyright: {\textcopyright}2018. The Authors.",
year = "2018",
month = nov,
day = "16",
doi = "10.1029/2018GL079619",
language = "English (US)",
volume = "45",
pages = "12,058--12,066",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "John Wiley and Sons Inc.",
number = "21",
}
