数字农科院2.0

Impacts of atmospheric CO2 enrichment on nitrous oxide emissions in wheat and rice cropping systems at global and local scales

文献类型： 外文期刊

作者： Yan, Shengji;Zhou, Guiyao;Revillini, Daniel;Liu, Yunlong;Qian, Haoyu;Deng, Aixing;Ding, Yanfeng;Jiang, Yu;Delgado-Baquerizo, Manuel;Zhang, Xin;Zhang, Weijian

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关键词： CO2 elevation;Nitrous oxide;Cumulative N2Oemission;Wheat Rice

期刊名称： EUROPEAN JOURNAL OF AGRONOMY

ISSN： 1161-0301

年卷期： 2025 年 174 卷

页码：

收录情况： SCIE（2025版）

摘要： Human activity is boosting atmospheric carbon dioxide (CO2), which further compounds the contributions to climate change through interaction effects with other greenhouse gases, especially nitrous oxide (N2O). However, the global-scale role of elevated CO2 (eCO2) in shaping N2O emissions across major cereal systems remains insufficiently studied. This effect can be especially important in cereal crops such as rice and wheat, which are among the most predominant crops on the planet and require different management strategies. Here, we combined meta-analysis of a global database (including rice and wheat cropping systems) with a two-year rice-wheat cropping experiment in eastern China; and found that eCO2 consistently promotes N2O emissions both at local and global scales in wheat cropping systems. For meta-analysis, we show that wheat cropping increased eCO2induced N2O emissions by 19.6 %, whereas rice cropping showed no significant changes. Local experiments supported the global results and revealed a potential functional mechanism for the positive relationship between eCO2 and N2O emissions, where eCO2 experimentally increased the ratio of microbial nitrite reductase gene abundances (nirK, nirS) to N2O reductase gene abundance (nosZ) in soil. Taken together, our study highlights the potential positive feedback among eCO2 and N2O, as well as the crucial role of cereal type in governing the eCO2 effect on N2O emissions, which is an important consideration for management to both mitigate climate change under global change and promote agricultural sustainability.

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