This flow is mainly determined by the flow of DOM from terrestrial biota into pedosphere qDOM. Assume that annual flow of DOM is equal to the net primary production (NPP), 140 Gt of dry matter, then qDOM = -1.4 x 1017g d.w. of DOM per year. Since a living biomass contains about 65% (on average) of water, then it is natural to assume that standing dead vegetation contains the same percentage of water, and the flow of dry DOM, -1.4 x 1017g, has to be accompanied by the water flow, -2.6 x 1017g H2O. By taking into
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