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<p>Soil dinitrogen (N<sub>2</sub>) fixation (SNF) is an important source of bioavailable nitrogen (N) in many ecosystems. Though increasing nutrient availability enhances soil fertility, how it impacts the rate of SNF across ecosystems has not been explored. Here, we investigated the impact of N, phosphorus (P) and molybdenum (Mo) enrichment on SNF across ecosystems (i.e. tropical/subtropical forest, temperate forest, grassland, agriculture, marginal land, wetland and plantation). Soil N<sub>2</sub> fixation is suppressed by N fertilization and stimulated by P and Mo fertilization. Fertilization regimes (nutrient-addition rates, duration, and load) affected the extent of SNF in response to nutrient addition. In addition, SNF was negatively correlated with soil total N concentration (<i>p</i> &lt; 0.05, r<sup>2</sup> = 0.02). We further found that there was a significant, but weak, positive correlation between the ratio of soil organic carbon (SOC) concentration: total N (TN) concentration (C: N) and the natural log response ratio (<i>p</i> &lt; 0.01, r<sup>2</sup> = 0.08). Our findings indicate that soil C: N stoichiometry significantly influences the response of SNF rates to fertilization. This effect can be attributed to the fact that N<sub>2</sub> fixation is an energy-demanding process, and N<sub>2</sub>-fixing organisms possess a competitive advantage under conditions of high carbon (C) but low N availability. Our study underscores the value of ecological stoichiometry in elucidating the mechanisms that link fertilization and SNF. These insights have significant implications for modeling and forecasting the impacts of nutrient enrichment and climate change on N cycling.</p>

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Organic Carbon to Nitrogen Ratio Influences the Response of Soil N2 Fixation to Nutrient Enrichment: A Meta-Analysis

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Runfu Li,
  • Wenli Ding,
  • Shikui Dong,
  • Wen-Feng Cong,
  • Fusuo Zhang,
  • Hans Lambers

摘要

Soil dinitrogen (N2) fixation (SNF) is an important source of bioavailable nitrogen (N) in many ecosystems. Though increasing nutrient availability enhances soil fertility, how it impacts the rate of SNF across ecosystems has not been explored. Here, we investigated the impact of N, phosphorus (P) and molybdenum (Mo) enrichment on SNF across ecosystems (i.e. tropical/subtropical forest, temperate forest, grassland, agriculture, marginal land, wetland and plantation). Soil N2 fixation is suppressed by N fertilization and stimulated by P and Mo fertilization. Fertilization regimes (nutrient-addition rates, duration, and load) affected the extent of SNF in response to nutrient addition. In addition, SNF was negatively correlated with soil total N concentration (p < 0.05, r2 = 0.02). We further found that there was a significant, but weak, positive correlation between the ratio of soil organic carbon (SOC) concentration: total N (TN) concentration (C: N) and the natural log response ratio (p < 0.01, r2 = 0.08). Our findings indicate that soil C: N stoichiometry significantly influences the response of SNF rates to fertilization. This effect can be attributed to the fact that N2 fixation is an energy-demanding process, and N2-fixing organisms possess a competitive advantage under conditions of high carbon (C) but low N availability. Our study underscores the value of ecological stoichiometry in elucidating the mechanisms that link fertilization and SNF. These insights have significant implications for modeling and forecasting the impacts of nutrient enrichment and climate change on N cycling.