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Observed community-level overyielding as a function of observed community-level plant–soil feedback (PSF). Community-level PSF and overyielding were calculated as the mean of community-specific species-level PSFs and species-level overyielding, respectively. Each point represents the mean value from one of 24 plant community–soil type combinations. Open and filled circles represent data from communities with and without nitrogen-fixing plants, respectively.
