Table 1. MEND model parameters.

Parameters	Description	A priori range	Eq.	Units
VP1	Maximum specific decomposition rate for P1	(0.1, 3)	S13	mg C mg−1 C h−1
VP2	Maximum specific decomposition rate for P2	(1, 50)	S14	mg C mg−1 C h−1
KP1	Half-saturation constant for P1 decomposition	(1, 100)	S13	mg C g−1 soil
KP2	Half-saturation constant for P2 decomposition	(1, 100)	S14	mg C g−1 soil
VM	Maximum specific decomposition rate for M	(0.05, 2)	S15	mg C mg−1 C h−1
KM	Half-saturation constant for M decomposition	(10, 1000)	S15	mg C g−1 soil
VD	Maximum specific uptake rate of D for growth	(0.0001, 0.5)	S18	mg C mg−1 C h−1
KD	Half-saturation constant for uptake of D	(0.05, 0.5)	S18	mg C g−1 soil
mR	Specific maintenance rate of BA=VD × α/(1− α)		S18	mg C mg−1 C h−1
α	=mR/(VD + mR)	(0.01, 0.5)		—
β	Ratio of dormant maintenance rate to mR	0.001	S23	—
YG	True growth yield	(0.1, 0.9)	S18	—
fD	Fraction of decomposed P1 and P2 allocated to D	(0.1, 1)	S3	—
gD	Fraction of dead BA allocated to D	(0.01, 1)	S1	—
pEP	Fraction of mR for production of EP1 and EP2	(0.001, 0.1)	S25	—
pEM	Fraction of mR for production of EM	(0.001, 0.1)	S25	—
rE	Turnover rate of EP1, EP2 and EM	(0.0001, 0.01)	S26	mg C mg−1 C h−1
Qmax	Maximum DOC sorption capacity	(0.5, 5)	S16	mg C g−1 soil
KBA	Binding affinity	(1, 16)		(mg C g−1 soil) −1
Kdes	Desorption rate	(0.0001, 0.1)	S17	mg C g−1 soil h−1
Kads	Specific adsorption rate=Kdes × KBA		S16	mg C mg−1 C h−1
LCF0	Initial fraction of P1=P1/(P1+P2)	(0.1, 0.95)		—
r0	Initial active fraction=BA/(BA+BD)	(0.01, 1)		—

Abbreviations: BA and BD, active and dormant microbial biomass; DOC, dissolved organic carbon; Eq., equations; LCF, lignocellulose fraction; MEND, microbial enzyme-mediated decomposition; Y_G, true growth yield.

Notes: The column ‘Eq' lists the major equation nos. (see Supplementary Information) in which each parameter is used.