Soil texture is an easily overlooked factor affecting the temperature sensitivity of N2O emissions

文献类型： 外文期刊

第一作者： Cui, Peiyuan

作者： Cui, Peiyuan;Chen, Zhixuan;Zhang, Hongcheng;Cui, Peiyuan;Chen, Zhixuan;Zhang, Hongcheng;Cui, Peiyuan;Fan, Fenliang;Song, Alin;Yin, Chang;Li, Tingqiang;Liang, Yongchao;Yin, Chang

作者机构：

关键词： Nitrous oxide(N2O) emission; Temperature sensitivity; Soil texture; qPCR

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 862 卷

页码：

收录情况： SCI

摘要： As a potent greenhouse gas, soil nitrous oxide (N2O) is strongly stimulated by rising temperature, triggering a positive feedback effect of global warming. However, its temperature sensitivity varies greatly among soils with different phys-ical and chemical characteristics, while associated mechanisms remain unknown. Here we performed a meta-analysis of the effect of warming on N2O emission and found distinctions in the response of N2O to temperature increase in soils with different textures. Then, we conducted an incubation experiment on 11 arable soils with varying textures sampled across China. The results show that the temperature sensitivity of N2O emissions was lower as soil texture became more clayey and was consistent with the outcome of meta-analysis. Further analysis was conducted by classifying the soils into clay and loam subgroups. As shown in the clay soil subgroup, N2O emission was significantly correlated with both inorganic nitrogen contents and potential denitrification and nitrification activities. Correlation analysis and partial least square (PLS) path model revealed that temperature mediated N2O emission by regulating nosZ gene abun-dance indirectly. In loam soils, however, the indirect effect of temperature on N2O production was achieved mainly through nirS gene abundance. Additionally, soil DON content strongly correlated with N2O emission in both subgroups and affected N2O emissions by influencing the abundance of denitrifiers under warming conditions. Our findings suggest that (i) soil texture was an important factor affecting temperature sensitivity of N2O emission and (ii) variable efficacy of warming in soil N2O production might originate from the enriching DON and nitrate content and its differ-ent indirect effects on nirS- or nosZ-type denitrifiers.

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