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SE IL and SW IN | I had the privilege of hosting some folks who were much smarter than I and I interpret the discussion as:
Soil carbon in the below plow layer zone starts in the vertical pathways of deep roots, (annual ryegrass & corn) and moves horizontally from there.
Since there is visual evidence that the albic silt layer in a Bluford Silt Loam soil is disrupted by ARG roots and is carried deeper with water through these pathways, it would stand to reason that soluble carbon is replacing it in the same complex process.
What I have no answer to is the age of this "soluble carbon" and the number of generations it takes to process residue and roots to the point that it is soluble or at least vertically leachable. And this might be the ramblings of folks that have spent too much time looking at soil cores and pits.
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THE SUBTLE SCIENCE BEHIND SOIL AGGREGATES
