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<p>Atmospheric nitrogen (N) deposition alters the N cycle and complicates nitrous oxide (N<sub>2</sub>O) production. However, the primary pathways driving N<sub>2</sub>O production in soils under different N type of deposition remain unclear. Here, we quantified the contributions of different N<sub>2</sub>O production processes via gamma-ray sterilization and inhibition techniques in Moso bamboo (<i>Phyllostachys edulis</i>) forest soils under inorganic N (NH<sub>4</sub>NO<sub>3</sub>, IN) and organic N (urea + glycine, ON) deposition. Results indicate that both IN and ON deposition increased abiotic N₂O production by 17.2% and 16.5%, respectively, but abiotic processes only contributed 14.5–16.2% of total N<sub>2</sub>O emissions. Microbial processes dominated N<sub>2</sub>O production in both IN and ON treatments, with nitrifier denitrification accounting for 54.6–64.3%. Regardless N type, ammonia-oxidizing bacteria (AOB)-driven N<sub>2</sub>O production (42.9–48.1%) exceeded that of ammonia-oxidizing archaea (AOA). Notably, IN deposition led to a greater increase in N₂O emissions via nitrifier denitrification compared to ON deposition, likely due to elevated ammonium levels and greater AOB <i>amoA</i> gene abundance. This study highlights the unique impacts of IN and ON inputs on soil N₂O emissions, emphasizing the critical role of both abiotic and biotic processes in shaping soil N transformations, especially the contribution of nitrifier denitrification to soil N<sub>2</sub>O emission.</p>

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Both biotic and abiotic soil N₂O productions are lower under organic N than inorganic N deposition in a Moso bamboo forest

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Wenting Jiang,
  • Yan Wang,
  • Yongxin Lin,
  • Hiroko Akiyama,
  • Yunying Fang,
  • Tony Vancov,
  • Shenglei Fu,
  • Hojeong Kang,
  • Xinli Chen,
  • Zhengqin Xiong,
  • Zhijie Li,
  • Shuijin Hu,
  • Yongfu Li,
  • Bing Yu,
  • Scott X. Chang,
  • Yanjiang Cai

摘要

Atmospheric nitrogen (N) deposition alters the N cycle and complicates nitrous oxide (N2O) production. However, the primary pathways driving N2O production in soils under different N type of deposition remain unclear. Here, we quantified the contributions of different N2O production processes via gamma-ray sterilization and inhibition techniques in Moso bamboo (Phyllostachys edulis) forest soils under inorganic N (NH4NO3, IN) and organic N (urea + glycine, ON) deposition. Results indicate that both IN and ON deposition increased abiotic N₂O production by 17.2% and 16.5%, respectively, but abiotic processes only contributed 14.5–16.2% of total N2O emissions. Microbial processes dominated N2O production in both IN and ON treatments, with nitrifier denitrification accounting for 54.6–64.3%. Regardless N type, ammonia-oxidizing bacteria (AOB)-driven N2O production (42.9–48.1%) exceeded that of ammonia-oxidizing archaea (AOA). Notably, IN deposition led to a greater increase in N₂O emissions via nitrifier denitrification compared to ON deposition, likely due to elevated ammonium levels and greater AOB amoA gene abundance. This study highlights the unique impacts of IN and ON inputs on soil N₂O emissions, emphasizing the critical role of both abiotic and biotic processes in shaping soil N transformations, especially the contribution of nitrifier denitrification to soil N2O emission.