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. 2017 Oct 18;8:2032. doi: 10.3389/fmicb.2017.02032

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Copyright © 2017 Zhang, Yang, Ling, Van Nostrand, Shi, Zhou and Dong.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Redundancy analysis (RDA) ordination biplot showing the relationships between environmental variables and total 16S rRNA (A) and nifH (B) gene groups. Only the most abundant groups are shown in the biplot.