I can't comment on the value, because I'm not a carbon expert.
Soils in eastern Canada, so in Ontario, Quebec and New Brunswick, are worked under very wet conditions. This is also the case for soils in British Columbia's Fraser Valley. In general, soils in the east become much more sensitive to compaction than soils in the west, where there are greater water deficits.
A soil health study, based on a sample of 470 profiles, has just been conducted in Quebec. It clearly shows that the problem of compaction has increased. About 60% of the soil is affected by compaction. I don't think the numbers are as high in western Canada. It's really a problem in eastern Canada. However, organic matter levels are generally higher in eastern Canada because the climatic environment is more conducive to biomass production. So the link is not direct. The decline in organic matter in the east at some level is not as critical as it may be in the west. There are really significant differences there.