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Soils that exhibit soil organic carbon (SOC) saturation provide an opportunity to examine mechanisms of C storage in soils with increasingly limited C-stabilization potential. A manure rate experiment in Lethbridge, Alberta, in which SOC responded asymptotically to long-term manure C additions, allowed us to assess changes in SOC biochemical composition in response to soil C saturation. By quantifying...
Current estimates of soil C storage potential are based on models or factors that assume linearity between C input levels and C stocks at steady-state, implying that SOC stocks could increase without limit as C input levels increase. However, some soils show little or no increase in steady-state SOC stock with increasing C input levels suggesting that SOC can become saturated with respect to C input...
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