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Understanding the rhizodeposited carbon (C) dynamics of winter wheat ( Triticum aestivum  L.), is crucial for soil fertility and C sequestration. Pot-grown winter wheat was pulse labelled with  14 CO 2  at the key growth stages.  14 C in the shoots, roots and soil was measured at 5 or 2 days after  14 C-labelling (DAL 5/2) at each growth stage and at harvest. The  14 C in the shoots increased from 4% of the net  14 C recovered (shoots + roots + soil) during tillering to 53% at harvest. Approximately 14–34% of the net  14 C recovered was incorporated into the soil. Allocation of photosynthesized C was extrapolated from the pot experiment to field condition, assuming a planting density of 1.8 million plants ha −1 . The estimated C input to the soil was 1.7 t C ha −1 , and 0.7 t C ha −1  of root residues was retained after wheat harvest; both values were higher than those previously reported (0.6 and 0.4 t C ha −1 , respectively). Our findings highlight that C tracing during the entire crop season is necessary to quantify the temporal allocation of photosynthesized C, especially the contribution to soil carbon in intensified farming system.

Allocation of photosynthesized carbon in an intensively farmed winter wheat–soil system as revealed by 14CO2 pulse labelling