Nitrous oxide (N₂O) emissions are a serious global issue, with substantial evidence indicating that hydroclimate processes significantly contribute to these emissions. Forests, covering one-third of global land, are key in the water cycle and influence hydroclimate processes, which vary with climate, latitude, and forest types. The role of hydroclimate in regulating global forest N₂O emission remains largely unknown. Our global analysis shows that hydroclimate factors dominate the latitudinal gradient of forest N₂O fluxes, which decrease with latitude. N₂O fluxes are highest in tropical forests, followed by temperate and boreal forests. Hydroclimate factors contribute 78.2% to N₂O fluxes, while soil factors contribute 21.8%. Our results urgently call for future studies to investigate the relationship between N₂O flux and hydroclimate factors like radiation, evapotranspiration, and vapor pressure deficits. Collectively, these findings highlight hydroclimate significant impact on N₂O emissions and suggest incorporating these factors into predictive models for greater accuracy.

一氧化二氮 (N ₂ O) 排放是一个严重的全球问题，大量证据表明水文气候过程对这些排放有显着影响。森林覆盖全球土地的三分之一，是水循环的关键，并影响水文气候过程，而水文气候过程因气候、纬度和森林类型而异。水文气候在调节全球森林 N ₂ O 排放中的作用仍然很大程度上未知。我们的全球分析表明，水文气候因素主导了森林 N ₂ O 通量的纬度梯度，该梯度随着纬度的增加而减小。 N ₂ O 通量在热带森林中最高，其次是温带和北方森林。水文气候因素对N ₂ O通量贡献78.2%，土壤因素贡献21.8%。我们的研究结果迫切需要未来的研究来调查 N ₂ O 通量与水文气候因素（如辐射、蒸散和蒸气压不足）之间的关系。总的来说，这些发现强调了水文气候对 N ₂ O 排放的重大影响，并建议将这些因素纳入预测模型以提高准确性。