No that’s just not true. Carbon does persist in soil. For how long is a very different question.
Once Soil Organic Carbon is converted to Microbial Organic Matter it is much more robust.
But the threats that climate change bring also threaten the stability of land ecosystems (drought, increased forest fires, etc) which will release the carbon stored in the soil.
So we shouldn’t rely on soil alone to sequester carbon(nor should it make up the bulk of our sequestration portfolio), but to claim it doesn’t persist in soil is a false statement.
Sorry you're just wrong or focussing on a topic not the one at hand. Of course SOC is good for soil health. But for sequestration over any meaningful time frame you need to go below plow depth.
For further reading the best long term study of which I am aware on SOC via cover cropping (and that's all that we are interested in here is long-term) over 19 years found actual losses of carbon not gains at the soil depths that are important. [0]
... If we only measured soil C in the top 30 cm, we would have assumed an increase in total soil C increased with WCC alone, whereas in reality significant losses in SOC occurred when considering the 2 m soil profile. Ignoring the subsoil carbon dynamics in deeper layers of soil fails to recognize potential opportunities for soil C sequestration, and may lead to false conclusions about the impact of management practices on C sequestration....
Once Soil Organic Carbon is converted to Microbial Organic Matter it is much more robust.
But the threats that climate change bring also threaten the stability of land ecosystems (drought, increased forest fires, etc) which will release the carbon stored in the soil.
So we shouldn’t rely on soil alone to sequester carbon(nor should it make up the bulk of our sequestration portfolio), but to claim it doesn’t persist in soil is a false statement.