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Fig. 2. Relationship between species richness differentiated according to the presence of (A) legumes or (C) grasses, or functional group richness differentiated according to the presence (B) of legumes or (D) grasses, and concentrations of NO3 in KCl extracts in autumn 2003. Data are presented as mean ± standard error. Note that there is no 60-species mixture without legumes.
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