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Fig. 4 | SpringerPlus

Fig. 4

From: Microbial diversity and community structure of denitrifying biological filters operated with different carbon sources

Fig. 4

The diversity indices of biofilm samples from different external carbon source fed DNBFs. a Shannon diversity index (H); b Shannon evenness (E). R1, R2 and R3 were acetate, ethanol and methanol-fed DNBF. BS1, BS2 and BS3 were biofilm sampling at 0, 200 and 400 mm from the bottom of the filter layer. CB and AB were captured biofilm and attached biofilm

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