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<p>The signaling compound nitric oxide (NO) might play an important, yet unquantified role in mediating soil biogeochemical Carbon and Nitrogen cycles. This study quantified the effects of different soil-typical exogenous NO concentrations on the microbial community, on fertilizer N turnover, and on C and N trace gas fluxes of agricultural soil. For this, we repeatedly established soil NO concentrations of either 0, 200, 400, and ppbv˗NO in soil mesocosms for in total of 12&#xa0;days, followed by high-resolution automated measurements of CO<sub>2</sub>, NO, CH<sub>4</sub>, and N<sub>2</sub>O fluxes, molecular analysis of microbial community composition and <sup>15</sup>N-isotope-tracing based assessment of fertilizer N turnover. We found no effects of different NO levels on microbial communities and CO<sub>2</sub>, CH<sub>4</sub>, and NO fluxes. However, at 200 ppbv concentration, exogenous NO promoted microbial assimilation of fertilizer N. In contrast, at 400 ppbv˗NO concentration, microbial biomass N was reduced, and microbial uptake of fertilizer N was inhibited, accompanied by a 33% reduction of N<sub>2</sub>O emissions. This suggested a promoting effect of 200 ppbv˗NO on the physiology of cells involved in heterotrophic microbial N turnover, probably reinforcing the role of cell-endogenous NO. In contrast, the higher exogenous NO concentrations of 400 ppbv seemed to inhibit heterotrophic microbial inorganic N assimilation, with however no increase in N<sub>2</sub>O emissions due to detoxification mechanisms. In conclusion, our pioneering study provides first insights into impacts of exogenous NO on soil C and N biogeochemistry in natural soil systems and reveals a NO concentration-dependent regulation of microbial N retention.</p>

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The role of different exogenous NO concentrations on C and N biogeochemistry of an agricultural soil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月16日

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  • Logapragasan Subramaniam,
  • Eduardo Perez-Valera,
  • Antoine Berger,
  • Ulrike Ostler,
  • Florian Engelsberger,
  • Nicolas Brüggemann,
  • Laurent Philippot,
  • Klaus Butterbach-Bahl,
  • Michael Dannenmann

摘要

The signaling compound nitric oxide (NO) might play an important, yet unquantified role in mediating soil biogeochemical Carbon and Nitrogen cycles. This study quantified the effects of different soil-typical exogenous NO concentrations on the microbial community, on fertilizer N turnover, and on C and N trace gas fluxes of agricultural soil. For this, we repeatedly established soil NO concentrations of either 0, 200, 400, and ppbv˗NO in soil mesocosms for in total of 12 days, followed by high-resolution automated measurements of CO2, NO, CH4, and N2O fluxes, molecular analysis of microbial community composition and 15N-isotope-tracing based assessment of fertilizer N turnover. We found no effects of different NO levels on microbial communities and CO2, CH4, and NO fluxes. However, at 200 ppbv concentration, exogenous NO promoted microbial assimilation of fertilizer N. In contrast, at 400 ppbv˗NO concentration, microbial biomass N was reduced, and microbial uptake of fertilizer N was inhibited, accompanied by a 33% reduction of N2O emissions. This suggested a promoting effect of 200 ppbv˗NO on the physiology of cells involved in heterotrophic microbial N turnover, probably reinforcing the role of cell-endogenous NO. In contrast, the higher exogenous NO concentrations of 400 ppbv seemed to inhibit heterotrophic microbial inorganic N assimilation, with however no increase in N2O emissions due to detoxification mechanisms. In conclusion, our pioneering study provides first insights into impacts of exogenous NO on soil C and N biogeochemistry in natural soil systems and reveals a NO concentration-dependent regulation of microbial N retention.