Fig. 2. Nonlabile soil C respiration (c), microbial C and N, and net N mineralization rate plotted against total plant biomass, labile C, and root N concentration, with regression lines. For the relationship between labile C and microbial C and N A. millefolium plots were excluded in the regression analyses, while for the relationship between labile C and net N mineralization L. perennis plots were excluded.