Don’t forget “burn up in forest fires”. I’m also curious if “decay” functionally implies a 100% carbon release rate or if some percentage is functionally sequestered.
Relevant: "Despite their destructive appearances even intense forest fires do not actually consumer much biomass. Only 0.1%–3.2%, since the larger trees and thicker branches that make up most of the biomass in a forest are good at resisting fires"[0]