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Fig. 2. Hypothetical representation of seasonally variable CO2 sources from different root processes contributing to total soil respiration. Root processes that generate CO2 directly (root growth and root respiration) or indirectly (microbial respiration of root exudates) are shown to be seasonal, turning on and off depending on crop growth and phenology. A strongly seasonal pattern of total CO2 production by roots (Rrrh) is generated, even though none of the individual process rates correlate with temperature.
