Files in this Data Supplement:

• Supplemental file 1 - Relative abundance of terminal restriction fragments of copper-containing nitrite reductase (nirK) gene fragments amplified by nirK-specific PCR from soil DNA extracts of individual plant microcosms (Fig. S1); correspondence analysis ordination plots from nirK-type denitrifier communities in soil samples from monocultures, based on nirK T-RFLP data (Fig. S2); canonical correspondence analysis ordination plot for the effect of plant species identity and sampling time on nirK-type denitrifier community composition in soil samples from monocultures, based on nirK T-RFLP data (Fig. S3).
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