For each treatment, the CO2 emission rates were significantly
higher at 25 C than at 5 C, which indicates that the decomposition
intensity generally increases with increasing temperature. The
magnitude of this difference (CO2 emission at 25 C minus CO2
emission at 5 C) decreases in the sequence manure > slurry and
biochar/slurry > biochar and control (differences are significant
between the treatments separated by “>”). This suggests that the
temperature effect on the decomposition intensity is substrate-specific and largest for manure while lowest for biochar. The overestimated CO2 fluxes by the two-pool-model for manure at
5 C probably result from this high temperature sensitivity of
manure decomposition, leading to disproportionally higher CO2
fluxes at 25 C compared to 5 C.