The impact of atmospheric N deposition and N fertilizer type on soil nitric oxide and nitrous oxide fluxes from agricultural and forest Eutric Regosols

Song, Ling; Drewer, Julia ORCID: https://orcid.org/0000-0002-6263-6341; Zhu, Bo; Zhou, Minghua; Cowan, Nicholas; Levy, Peter ORCID: https://orcid.org/0000-0002-8505-1901; Skiba, Ute ORCID: https://orcid.org/0000-0001-8659-6092. 2020 The impact of atmospheric N deposition and N fertilizer type on soil nitric oxide and nitrous oxide fluxes from agricultural and forest Eutric Regosols. Biology and Fertility of Soils, 56 (7). 1077-1090. https://doi.org/10.1007/s00374-020-01485-6

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Abstract/Summary

Agricultural and forest soils with low organic C content and high alkalinity were studied over 17 days to investigate the potential response of the atmospheric pollutant nitric oxide (NO) and the greenhouse gas nitrous oxide (N2O) on (1) increased N deposition rates to forest soil; (2) different fertilizer types to agricultural soil and (3) a simulated rain event to forest and agricultural soils. Cumulative forest soil NO emissions (148–350 ng NO-N g−1) were ~ 4 times larger than N2O emissions (37–69 ng N2O-N g−1). Contrary, agricultural soil NO emissions (21–376 ng NO-N g−1) were ~ 16 times smaller than N2O emissions (45–8491 ng N2O-N g−1). Increasing N deposition rates 10 fold to 30 kg N ha−1 yr−1, doubled soil NO emissions and NO3− concentrations. As such high N deposition rates are not atypical in China, more attention should be paid on forest soil NO research. Comparing the fertilizers urea, ammonium nitrate, and urea coated with the urease inhibitor ‘Agrotain®,’ demonstrated that the inhibitor significantly reduced NO and N2O emissions. This is an unintended, not well-known benefit, because the primary function of Agrotain® is to reduce emissions of the atmospheric pollutant ammonia. Simulating a climate change event, a large rainfall after drought, increased soil NO and N2O emissions from both agricultural and forest soils. Such pulses of emissions can contribute significantly to annual NO and N2O emissions, but currently do not receive adequate attention amongst the measurement and modeling communities.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1007/s00374-020-01485-6
UKCEH and CEH Sections/Science Areas:	Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN:	0178-2762
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	atmospheric N deposition, ammonium nitrate, urea, urease inhibitor, pulsing effect
NORA Subject Terms:	Agriculture and Soil Science
Date made live:	03 Jul 2020 12:45 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528041

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