Why does the % of max. cation exchange capacity (CEC) that can effectively serve as CEC lower with lower pH?

IN SOIL SCIENCE The only thing I can think of is the principles of zero point charge. something like.... as charge increases with changing pH cations are less able to adhere to -or in- a soil colloid. H+ would repulse cations. This in turn would mean a lowed CEC, which would lead to a less fertile, more acidic... show more IN SOIL SCIENCE

The only thing I can think of is the principles of zero point charge.
something like.... as charge increases with changing pH cations are less able to adhere to -or in- a soil colloid. H+ would repulse cations. This in turn would mean a lowed CEC, which would lead to a less fertile, more acidic soil.

please correct me, or confirm this.

THNX!
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