Temperature sensitivity of biomass‐specific microbial exo‐enzyme activities and CO 2 efflux is resistant to change across short‐ and long‐term timescales

作者：Kyungjin Min, Kate M. Buckeridge, Susan E. Ziegler, Kate A. Edwards, Samik Bagchi, Sharon Billings · 发表于：Global Change Biology · 年份：2019 · DOI：10.1111/gcb.14605 · 被引用次数：45 · 研究领域：Biofuel production and bioconversion、Anaerobic Digestion and Biogas Production、Carbon Dioxide Capture Technologies

Abstract Accurate representation of temperature sensitivity ( Q 10 ) of soil microbial activity across time is critical for projecting soil CO 2 efflux. As microorganisms mediate soil carbon (C) loss via exo‐enzyme activity and respiration, we explore temperature sensitivities of microbial exo‐enzyme activity and respiratory CO 2 loss across time and assess mechanisms associated with these potential changes in microbial temperature responses. We collected soils along a latitudinal boreal forest transect with different temperature regimes (long‐term timescale) and exposed these soils to laboratory temperature manipulations at 5, 15, and 25°C for 84 days (short‐term timescale). We quantified temperature sensitivity of microbial activity per g soil and per g microbial biomass at days 9, 34, 55, and 84, and determined bacterial and fungal community structure before the incubation and at days 9 and 84. All biomass‐specific rates exhibited temperature sensitivities resistant to change across short‐ and long‐term timescales (mean Q 10 = 2.77 ± 0.25, 2.63 ± 0.26, 1.78 ± 0.26, 2.27 ± 0.25, 3.28 ± 0.44, 2.89 ± 0.55 for β‐glucosidase, N ‐acetyl‐β‐ d ‐glucosaminidase, leucine amino peptidase, acid phosphatase, cellobiohydrolase, and CO 2 efflux, respectively). In contrast, temperature sensitivity of soil mass‐specific rates exhibited either resilience (the Q 10 value changed and returned to the original value over time) or resistance to change. Regardless of the microbial flux responses,...