数字农科院2.0

Sensitivity of Soil Organic Matter Priming to Warming Depends on Diurnal Temperature Cycle

文献类型： 外文期刊

作者： Xiao, Qiong;Zhang, Wenju;Wu, Lei;Huang, Yaping;Wang, Jun;Cai, Zejiang;Li, Dongchu;Chen, Xiangbi;Ge, Tida;Xu, Minggang;Kuzyakov, Yakov

作者机构：

关键词： SOM mineralization;temperature sensitivity;priming effect;microbial community;enzyme activity

期刊名称： JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

ISSN： 0021-8561

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Understanding soil organic matter (SOM) mineralization is critical for predicting soil carbon (C) cycling, yet the effects of diurnal temperature fluctuations and their interactions with labile C inputs remain unclear. Arable soils were incubated for 42 days under constant temperatures (15 or 25 degrees C) or diurnal temperature fluctuations, without or with 13C-glucose addition. Diurnal fluctuations enhanced cumulative SOM mineralization and priming effects, with a higher temperature sensitivity (Q 10) of priming (2.6) than constant temperatures (2.4). The higher Q 10 was associated with an increased response of C-degrading enzyme activities to warming. At the community level, fungal diversity declined with warming, particularly under diurnal fluctuations. Although microbial networks were restructured, their topology exerted little influence on SOM mineralization. Instead, fungal diversity and cellobiohydrolase activity were the primary drivers of variation in SOM mineralization and its Q 10. These findings provide mechanistic insights into soil C cycling under climate change, emphasizing the importance of incorporating daily temperature fluctuations into predictive models.

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