The respiration from the litter, faeces and humus pools, CLitter1 and 2→CO2, CFaecesCO2 and CHumusCO2 are based on the estimated consumption rate of the microbes with their efficiency explicitly taken into account:


where fe,m and fcons,l1 are the same parameters as in eq. (6.9), f(CNl1) and f(CLitter1) are response functions and Mpotcons is the potential microbial consumption as defined above. The response functions equal unity for the respiration flux from the humus pool.

The respiration in the microbial biomass is calculated as:


where km,resp is a parameter and f(Acons) is the response function for abiotic influence on microbial consumption described above.