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Warm soils change microbes, not Q10 of respiration
Along a >31°C geothermal gradient in New Zealand, bacterial and fungal communities shifted but MMRT temperature-sensitivity of soil respiration showed no thermal adaptation.
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Did long-term geothermal warming change temperature sensitivity of SOM decomposition?
No—authors found no evidence for thermal adaptation of microbial SOM decomposition.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
Did microbial communities still shift?
Yes—bacteria and fungi differed by biome and by distance from the heated depression.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
What MET range did the gradient cover?
More than 31°C, from 16.9 ± 0.8°C to 48.3 ± 5.1°C.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
Where was the site?
East of Taupō in the Taupō Volcanic Zone, New Zealand.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
How did soil C change with depth?
Mean C 16.6% in 0–50 mm vs 5.1% in 50–100 mm.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
Were grassland and kānuka communities distinct?
Yes—bacterial and fungal compositions differed between biomes (p = .001).
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
What temperature-response models were compared?
MMRT and Lloyd & Taylor, with Q10 derived from both for 35 curves.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
What problem appeared in Topt estimates?
Values ranged 49.8–103°C, the high end far above typical biological soil temperatures.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
Did water content differ among treatments?
No statistically significant differences in volumetric water content.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
Why does unchanged sensitivity matter for the carbon cycle?
If microbes do not down-regulate Q10, warming may still accelerate SOM CO2 losses even after community turnover.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified
How many CO2 measurements were made in one day?
1584 headspace measurements.
Source: Soil microbial sensitivity to temperature remains unchanged despite community compositional shifts along geothermal gradients · DOI · quote verified