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. 2008 Oct 22;3(10):e3489. doi: 10.1371/journal.pone.0003489

Figure 3. Interacting effects of plant diversity and earthworms.

Figure 3

Effects of plant species richness (1, 4, and 16-species mixtures) and earthworm treatment (earthworm reduction [-ew] and earthworm addition [+ew]) on the coefficient of variation (CV; [%]) of (A) the number and (B) biomass of herb invaders in the years 2004 to 2006 and effects of plant functional group richness (1, 2, 3, and 4 plant functional groups) and earthworm treatment on the CV [%] on (C) the number and (B) biomass of herb invaders in the years 2004 to 2006. Means with standard errors.