Supplementary material to "Mechanisms of soil organic carbon and nitrogen stabilization in mineral associated organic matter – Insights from modelling in phase space"

Generalized model including dissolved organic matter dynamicsC and N are transferred between POM and MAOM compartments partly via dissolved organic matter (DOM), which is only considered implicitly in the model presented in the main text (Fig. 1).In this appendix, we present a more general model including a DOM compartment, and show which simplifications lead to the model used in the main text.To construct this more general model, we assume that a fraction of the depolymerized products from POM and MAOM are used locally by the respective microbial communities (fractions 1 - and 1 - , respectively) and a fraction is transferred to a 'shared' DOM compartment (fractions and , respectively).DOM is then taken up by both communities according to the rates and equilibrium (i.e., ⁄ ≈ 0) because it is a small C compartment with relatively fast turnover rates.Mathematically, this means that ≈ + , which allows simplifying Eq. ( 1)-( 5) and obtain the model described in the main text (after re-naming = ).