12 Sep 2023
 | 12 Sep 2023
Status: this preprint is open for discussion.

Parent material influences soil abiotic N2O production from chemical oxidation of hydroxylamine

Suyun Li, Cai Gan, Danni Cai, Jiani Ma, and Shurong Liu

Abstract. Hydroxylamine (NH2OH) and nitrite (NO2-) represent pivotal nitrification intermediates that substantially govern soil abiotic N2O production. Yet, the intricate factors influencing the abiotic formation of N2O from chemical reactions involving NH2OH and NO2- remain uncertain. This study was designed to reveal the impacts of land use type and parent material on soil abiotic N2O production in response to NH2OH and NO2- amendments. Our investigation revealed that land use type exerted no significant influence on abiotic production of N2O with NH2OH and NO2- addition. Nevertheless, the parent material exhibited a notable (P < 0.01) effect on N2O production intrigued by NH2OH addition. Specifically, a markedly higher abiotic N2O production from NH2OH was observed in soils developed from Quaternary red clay than those derived from granite. Subsequent analysis demonstrated that the soils originating from Quaternary red clay displayed significantly higher manganese (Mn) content in comparison to those originating from granite. This finding consistently aligns with the close correlation between the abiotic N2O production via chemical oxidation of NH2OH and Mn content of soil. Furthermore, the site preference (SP) values for N2O arising from NH2OH and NO2- addition were 25–30 ‰ and around 20 ‰, respectively, aligning with the expected ranges characterizing ammonia oxidation and chemodenitrification processes. Our findings provide valuable insight into the distinct influence of parent material on soil abiotic N2O production via chemical oxidation of NH2OH, contributing to a better understanding of the underlying mechanisms, and highlight the significance of soil factors in regulating abiotic N2O production within soil ecosystems.

Suyun Li et al.

Status: open (until 08 Nov 2023)

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Suyun Li et al.

Suyun Li et al.


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Short summary
To investigate the influence of parent material and land use on N2O emissions, a multifaceted approach involving gamma irradiation and site preference techniques was used. A significant impact of parent material on N2O production in soils treated with hydroxylamine was observed. Neither parent material nor land use exerted a significant effect on N2O emissions in the case of nitrite amendments. The site preference values indicated that abiotic pathways took the lead.