This implementations follows the description in Katterer and Andren (2001, Eco Mod 136:191).
ICBM_N(
i = 0.47,
k_Y = 0.259,
k_O = 0.0154,
r_e = 1,
e_Y = 0.362,
h = 0.243,
q_i = 18.8,
q_b = 5
)
carbon input to the soil from plant production
decomposition rate of young pool Y
decomposition rate of old pool O
external effects on decomposition rates
yield efficiency of the soil organism community
humification coefficient. Fraction of outflux from Y that is not respired and enters O
C:N ratio of plant inputs
C:N ratio of soil organism biomass