Redundancy analysis (RDA) based on T-RFLP data obtained for the <i>bph</i> gene, and soil properties, at the four studied sites.

<p>Arrows indicate correlation between the chemical parameters and community structure of samples. The significance of correlations was evaluated via Monte Carlo permutation test and it is indicated as follows: * <i>p</i><0.05. ADE = Amazon Dark Earth; ADJ = Adjacent soils; SF = Secondary Forest; M = Manioc cultivation.