Down core fits for a microbial and mineral-sorption with transport of #soilOrganicCarbon explains old soils without the need for traditional passive pools. Ahrens etal 2015 https://doi.org/10.1016/j.soilbio.2015.06.008 #ProcessModel #LandCarbon #SciLit

One of those papers where I'm a little ashamed at how long it took me to find/read.