Microorganisms exert overriding impacts on the temperature sensitivity of soil C decomposition than substrate quality
Gang Huang , Yan-gui Su
Soil Ecology Letters ›› 2025, Vol. 7 ›› Issue (2) : 250303
Microorganisms exert overriding impacts on the temperature sensitivity of soil C decomposition than substrate quality
Understanding the temperature sensitivity (Q10) of soil carbon (C) decomposition and the driving forces is vital for projecting soil C dynamics under climate warming. However, it is unclear of the geographic patterns in Q10 and its driving forces in water-limited regions. We measured Q10 of C decomposition and multiple facets of both C quality and microbial properties, including microbial diversity, abundance, composition, activity, and trophic strategy from two soil depths (0−10 cm, 30−50 cm) collected at 38 sites along a 2000-km transect in northern China’s deserts. Q10 ranged in 1.56−4.80 and was significantly higher in the top (3.21) than deep soil (2.61). The large variation in Q10 is directly determined by microorganisms, rather than C quality which is the ratio of microbial C decomposition rate over soil organic C content. Microbial diversity, the ratio of fungi to bacterial abundance (F:B), and mass-specific respiration (qCO2) were driving forces for spatial variation in Q10. Microbial diversity negatively impacted Q10, while higher F:B and qCO2 stimulated Q10. Higher C quality indirectly inhibited Q10 by improving microbial diversity, and decreasing F:B and qCO2. Our study demonstrates that microorganisms drive the geographic variations in Q10.
climate warming / C quality-temperature theory / microbial diversity / F:B / temperate desert.
| ● Q10 ranged from 1.56−4.80 and was higher in the top than deep soil. | |
| ● The total effect of microorganisms was higher than C quality on Q10 of C decomposition. | |
| ● Microbial diversity, F:B, and qCO2 were driving forces over the variation in Q10. | |
| ● Q10 was negatively associated with microbial diversity, positively with F:B and qCO2. | |
| ● C quality changed microorganisms to indirectly mediate Q10. |
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Higher Education Press
Supplementary files
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