flowerbug
Garden Master
I couldn't find the link but I saw recently that archeologists have uncovered 6 ft deep evidence of burning and composting in the Mayan empire area some 1,000 years ago and older. NOT natural since the jungle soil is only naturally inches deep. It takes Constant plant death to feed the jungle.
it's just a fact that life happens fast in the jungle and decomposition happens fast too so most of the nutrients in a jungle are in the biomass of the trees and animals.
it is also harder to keep carbon in the soil the warmer the climate. in the area where it is cooler here it is possible to have more and to keep it easier, but the most stable forms are those that last the longest (bits of charcoal and humus/humic acids).