Soil clay content determined the temperature response of N2O emissions derived from denitrification

IF 5 2区农林科学 Q1 SOIL SCIENCE

Applied Soil Ecology Pub Date : 2025-10-06 DOI:10.1016/j.apsoil.2025.106500

Lixin Jia , Hanhan Yang , Yong Li , Zhangliu Du , Xiaotang Ju , Yue Li , Di Wu

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引用次数: 0

Abstract

Soil nitrous oxide (N₂O) emissions resulting from denitrification constitute a significant source of greenhouse gas emissions in the agricultural sector. However, how warming affects denitrification-derived N₂O emissions in croplands remains poorly understood, presenting challenges for predicting greenhouse gas feedback loops under climate change. In this study, we evaluated the temperature sensitivity of potential N₂O emissions from denitrification in cropland soils, employing the N₂O site preference approach to differentiate between bacterial and fungal contributions. Our findings reveal that fungal denitrification dominated N₂O emissions; however, warming decreased its contribution from 57.5 % to 51.5 %. Denitrification-derived N₂O emissions displayed significant variability across sites, and a strong positive correlation was observed between soil clay content and the Q₁₀ value of N₂O. This relationship was further supported by the global data provided. Our findings underscore the importance of incorporating both soil properties and fungal processes when projecting future N₂O emissions under global warming scenarios.

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土壤粘土含量决定了反硝化产生的N2O排放的温度响应

反硝化作用产生的土壤氧化亚氮（N2O）排放是农业部门温室气体排放的一个重要来源。然而，气候变暖如何影响农田中反硝化产生的N2O排放仍然知之甚少，这为预测气候变化下的温室气体反馈回路提出了挑战。在这项研究中，我们评估了农田土壤反硝化过程中潜在N2O排放的温度敏感性，采用N2O位点偏好方法来区分细菌和真菌的贡献。研究结果表明，真菌反硝化作用主导了N2O排放；然而，变暖使其贡献从57.5%下降到51.5%。反硝化引起的N2O排放在不同地点表现出显著的差异，土壤粘土含量与N2O Q10值之间存在很强的正相关关系。所提供的全球数据进一步支持了这种关系。我们的研究结果强调了在预测全球变暖情景下未来N2O排放时结合土壤特性和真菌过程的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Soil Ecology 农林科学-土壤科学

CiteScore

9.70

自引率

4.20%

发文量

363

审稿时长

5.3 months

期刊介绍： Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.