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 1 ; Zhang, Wenju 1 ; Wu, Lei 1 ; Huang, Yaping 1 ; Wang, Jun 1 ; Cai, Zejiang 1 ; Li, Dongchu 1 ; Chen, Xiangbi 3 ; Ge, Tida 4 ; Xu, Minggang 1 ; Kuzyakov, Yakov 5 ;
作者机构： 1.Chinese Acad Agr Sci CAAS, State Key Lab Efficient Utilizat Arable Land China, Key Lab Arable Land Qual Monitoring & Evaluat, Inst Agr Resources & Reg Planning,Minist Arg & Rur, Beijing 100081, Peoples R China
2.Chinese Acad Agr Sci CAAS, Inst Agr Resources & Reg Planning, Natl Observat Stn Qiyang Agriecol Syst, Qiyang 426182, Peoples R China
3.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China
4.Ningbo Univ, State Key Lab Qual & Safety Agroprod, Int Sci & Technol Cooperat Base Regulat Soil Biol, Ningbo 315211, Peoples R China
5.Univ Goettingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, D-37077 Gottingen, Germany
6.RUDN Univ, Peoples Friendship Univ Russia, Moscow 117198, Russia
关键词： SOM mineralization; temperature sensitivity; priming effect; microbial community; enzyme activity
期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）
ISSN： 0021-8561
年卷期： 2025 年 73 卷 32 期
页码：
收录情况： SCI
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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