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Background and Aims <p>Anthropogenic nitrogen (N) enrichment and grassland management strongly influence soil elemental cycling and stoichiometric balance. Our study aimed to elucidate how N enrichment and mowing influence elemental distribution across soil aggregate fractions.</p> Methods <p>Based on a 7-year field experiment, we quantified how N addition (0–50&#xa0;g&#xa0;m<sup>−2</sup>&#xa0;yr<sup>−1</sup> as (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>) and mowing altered carbon (C), N, phosphorus (P), and sulfur (S) availability and stoichiometry across soil aggregate fractions in a Eurasian meadow steppe.</p> Results <p>Soil pH decreased by 0.68–1.85 units and reduced microbial biomass C under N application, accompanied by marked increases in available N, P, and S. Small macroaggregates (250–2000&#xa0;μm) were enriched in total C, N, and P, whereas microaggregates (&lt; 250&#xa0;μm) had the highest total S concentrations and maintained the most stable element stoichiometry. It significantly reduced total elemental ratios of C:N, C:S, N:S, and P:S while increasing N:P under N addition, with mowing generally amplifying these stoichiometric responses under higher N input.</p> Conclusion <p>Our findings demonstrate that N enrichment reshapes elemental stoichiometry within soil aggregates by modifying soil pH and shifts labile nutrient availability. Mowing amplifies these effects under high N input, leading to hierarchical responses across soil aggregates, with macroaggregates more sensitive and microaggregates more stable, highlighting the importance of incorporating management interactions and aggregate-level heterogeneity into biogeochemical models and grassland management.</p>

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Nitrogen addition reshapes elemental distribution within soil aggregates: availability and stoichiometry of carbon–nitrogen-phosphorus-sulfur in a mown meadow steppe

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Jiayun Zhang,
  • Ruzhen Wang,
  • Xiaoxiao Wang,
  • Shuixia Li,
  • Fengqin Li,
  • Xuanning Guo,
  • Liangchao Jiang,
  • Jishuai Su,
  • Yuge Zhang,
  • Xingguo Han,
  • Yong Jiang,
  • Heyong Liu

摘要

Background and Aims

Anthropogenic nitrogen (N) enrichment and grassland management strongly influence soil elemental cycling and stoichiometric balance. Our study aimed to elucidate how N enrichment and mowing influence elemental distribution across soil aggregate fractions.

Methods

Based on a 7-year field experiment, we quantified how N addition (0–50 g m−2 yr−1 as (NH4)2SO4) and mowing altered carbon (C), N, phosphorus (P), and sulfur (S) availability and stoichiometry across soil aggregate fractions in a Eurasian meadow steppe.

Results

Soil pH decreased by 0.68–1.85 units and reduced microbial biomass C under N application, accompanied by marked increases in available N, P, and S. Small macroaggregates (250–2000 μm) were enriched in total C, N, and P, whereas microaggregates (< 250 μm) had the highest total S concentrations and maintained the most stable element stoichiometry. It significantly reduced total elemental ratios of C:N, C:S, N:S, and P:S while increasing N:P under N addition, with mowing generally amplifying these stoichiometric responses under higher N input.

Conclusion

Our findings demonstrate that N enrichment reshapes elemental stoichiometry within soil aggregates by modifying soil pH and shifts labile nutrient availability. Mowing amplifies these effects under high N input, leading to hierarchical responses across soil aggregates, with macroaggregates more sensitive and microaggregates more stable, highlighting the importance of incorporating management interactions and aggregate-level heterogeneity into biogeochemical models and grassland management.