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Mitigating soil nitrification and greenhouse gas emissions in non-paddy cropping systems by micro-molar hydrogen peroxide.

Authors :
Fan K
Piyathilake U
Wang Y
Lim JW
Lin C
Qin J
Qiu R
Source :
The Science of the total environment [Sci Total Environ] 2024 Nov 25; Vol. 953, pp. 176102. Date of Electronic Publication: 2024 Sep 10.
Publication Year :
2024

Abstract

Non-paddy cropping systems play a significant role in food production. However, excessive nitrogen loss from non-paddy soils through nitrate leaching and ammonia volatilization poses a significant challenge to environmental sustainability. In this study, microcosm and field-scale experiments were conducted to explore the potential for using hydrogen peroxide (H <subscript>2</subscript> O <subscript>2</subscript> ) to mitigate nitrogen loss and greenhouse gas emissions, aiming at filling gaps in knowledge regarding the underlying biochemical mechanisms. The results show that input of micromolar H <subscript>2</subscript> O <subscript>2</subscript> from either artificial addition or natural rainwater into soils in the presence of magnetite (Fe <subscript>3</subscript> O <subscript>4</subscript> ) could trigger Fenton-like reaction, which inhibited microbially mediated nitrification of soil-borne ammonium but did not affect the growth of the test crop plant (water spinach). In the absence of Fe <subscript>3</subscript> O <subscript>4</subscript> , input of rainwater-borne H <subscript>2</subscript> O <subscript>2</subscript> into non-paddy soils caused reduction in the emissions of nitrous oxide (N <subscript>2</subscript> O) and carbon dioxide (CO <subscript>2</subscript> ). There was a trend showing that the degree of reduction in N <subscript>2</subscript> O and CO <subscript>2</subscript> fluxes increased with increasing concentration of rainwater-borne H <subscript>2</subscript> O <subscript>2</subscript> . It was likely that microbially mediated reduction of iron oxides took place during rainfall events, providing Fe(II) that is needed for reaction with rainwater-borne H <subscript>2</subscript> O <subscript>2</subscript> , triggering Fenton-like reaction to inhibit the soil microbes that mediate production of N <subscript>2</subscript> O and CO <subscript>2</subscript> in the soils. The findings obtained from this study have implications for developing strategies to manage soil‑nitrogen to minimize its environmental impacts.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier B.V. All rights reserved.)

Details

Language :
English
ISSN :
1879-1026
Volume :
953
Database :
MEDLINE
Journal :
The Science of the total environment
Publication Type :
Academic Journal
Accession number :
39265688
Full Text :
https://doi.org/10.1016/j.scitotenv.2024.176102