Fig. 6. Summary schematic on management and drought impacts on tracers transfer in the plant-soil system.

Schematic of the influence of grassland management (left panel extensive, right panel intensive) and drought (negative impact in red, positive impact in violet, and no significant impact in black) on ¹³C uptake by plant shoot and transfer to roots, soil organisms and CO₂ efflux, and ¹⁵N transfer to N₂O efflux. The size of the arrows corresponds to the relative proportion of ¹³C or ¹⁵N incorporated by the plant, soil organisms and released as soil efflux. Pictures by M. Chomel, grassland illustration by J. C. Bardgett. Note that we present only the main effects, so every arrow (except the N₂O efflux) concerns ¹³C transfer. The transfer of ¹⁵N to soil organisms was not impacted by drought.