Relations between bacterial biomass and carbon cycle in marine sediments: an early diagenetic model.
A new model for early diagenetic processes has been developed through a new formula explicitly accounting for microbial population dynamics. Following a mechanistic approach based on enzymatic reactions, a new model has been proposed for oxic mineralisation and denitrification. It incorporates the dynamics of bacterial metabolism. We find a general formula for inhibition processes of which some other mathematical expressions are particular cases. Moreover a fast numerical algorithm has been developed. It allows us to perform simulations of different diagenetic models in non-steady states. We use this algorithm to compare our model to a classical one (Soetaert et al., 1996). Dynamical evolutions of a perturbation of particulate organic carbon (POC) input are studied for both models. The results are very similar for stationary cases. But with variable inputs, the bacterial biomass dynamics brings about noticeable differences, and these are discussed.
Talin
F
F
Centre d'Océanologie de Marseille, UMR 6535, Campus de Luminy, 13288 Marseille 08, France.
Tolla
C
C
Rabouille
C
C
Poggiale
J C
JC
D000465:Algorithms; D000818:Animals; D001419:Bacteria / Q000378:metabolism*; D005075:Biological Evolution; D018533:Biomass; D002244:Carbon / Q000378:metabolism*; D019015:Geologic Sediments / Q000382:microbiology*; D008432:Mathematical Computing; D008903:Minerals / Q000378:metabolism; D008962:Models, Theoretical; D009566:Nitrates / Q000378:metabolism; D010084:Oxidation-Reduction; D011157:Population Dynamics
D008903:Minerals; D009566:Nitrates; D002244:Carbon