SOM and pH
Fragment of a discussion from Course talk:APBI200/Archive/2014-15WT2
Rex, you are correct that decomposition of SOM leads to the formation of carbonic acid, and characteristically lower pH. But also consider the impact of functional groups e.g. R-COOH and buffering capacity.
CEC is linked to pH in soils with significant SOM; consider pH dependent charge.
SandraBrown (talk)