For about three decades, it has not been possible to completely balance global carbon emissions into known pools. A residual (or 'missing') sink remains. Here evidence is presented that part of soil respiration is allocated into an internal soil CO 2-sink localized to the saprophytic subsystem (roots excluded). The process occurs in forest, agricultural and grassland soils and is favoured by high N-deposition. Chemoautotrophic nitrification has a key role, and the most efficient internal CO 2-sequestration occurs concurrently with lowest soil nitrate (NO 3 −) concentrations, despite considerable N-loading. Not until drastic N-supply occurs, does the CO 2-sink successively breakdown, and nitrate concentrations increase, leading to NO 3 −-leaching. Within-soil CO 2-uptake seems to be of the same magnitude as the missing carbon sink. It may be gradually enforced by the ongoing input of nitrogen to the biosphere.
For about three decades, it has not been possible to completely balance global carbon emissions into known pools. A residual (or 'missing') sink remains. Here evidence is presented that part of soil respiration is allocated into an internal soil CO2-sink localized to the saprophytic subsystem (roots excluded). The process occurs in forest, agricultural and grassland soils and is favoured by high N-deposition. Chemoautotrophic nitrification has a key role, and the most efficient internal CO2-sequestration occurs concurrently with lowest soil nitrate (NO3-) concentrations, despite considerable N-loading. Not until drastic N-supply occurs, does the CO2-sink successively breakdown, and nitrate concentrations increase, leading to NO3--leaching. Within-soil CO2-uptake seems to be of the same magnitude as the missing carbon sink. It may be gradually enforced by the ongoing input of nitrogen to the biosphere
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