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As the dynamics and magnitude of rhizodeposition vary considerably among cropping systems, we investigated effects of cropping system on the incorporation of root-derived carbon (C) into Collembola, a dominant taxon of soil microarthropods. In the field, we used  13 CO 2  to pulse label a crop monoculture (oilseed rape,  Brassica napus  L.), a mixed-grass community (dominated by  Lolium perenne  L. mixed with clover  Trifolium repens  L.), and a tree plantation (willow,  Salix schwerinii  E.L. Wolf and  Salix viminalis  L.). During 28 days, the incorporation of  13 C was traced in nine species of Collembola including epedaphic (surface-dwelling), hemiedaphic (litter-dwelling), and euedaphic (soil-dwelling) functional groups. Incorporation of  13 C into Collembola reached a plateau before day 3 after the labeling in grass and willow, but increased up to day 14 in rape. While euedaphic Collembola incorporated less root-derived C than epedaphic and hemiedaphic Collembola in rape and willow, the incorporation of  13 C was similar among functional groups in grass. Differential incorporation of  13 C in euedaphic species points to niche differentiation within the same functional group. Our findings highlight that cropping system not only affects the flux of root C into soil mesofauna, being slower in rape than in grass and willow, but also the utilization of root-derived resources by functional groups and species of Collembola. The results indicate that pronounced differences in belowground C inputs between cropping systems affect microbivores as basal species and thereby soil food webs and their functioning and services.

Incorporation of root-derived carbon into soil microarthropods varies between cropping systems