Table 3.

Classification, distribution, and relative abundance of 16S rRNA-defined bacterial OTUs recovered from aerial samples treated with 5 different concentrations of organic matter in soil. OTUs shown were detected in at least 2 out of 6 replicates per treatment condition.

	OTU	Phyla	Family or genus	Average percent/group
				T1	T2	T3	T4	T5
T1	0226	Actinobacteria	Actinoplanes	0.564*	0.037	0.000	0.000	0.000
	1757	Bacteroidetes	Spongiimonas	0.102*	0.000	0.000	0.000	0.000
	0423	Alphaproteobacteria	Lentibacter	0.239*	0.051	0.059	0.039	0.094
T2	0140	Actinobacteria	Streptomyces	0.061	0.161*	0.013	0.000	0.000
	0128	Bacteroidetes	Niastella	0.086	0.189*	0.014	0.000	0.000
	0158	Chloroflexi	Anaerolineaceae	0.017	0.150*	0.014	0.012	0.000
	0110	Chloroflexi	Kallotenue	0.008	2.638*	0.114	0.082	0.014
	0269	Chloroflexi	Ktedonobacter	0.000	0.110*	0.004	0.000	0.000
	0025	Betaproteobacteria	Comamonadaceae	0.174	0.506*	0.053	0.270	0.089
	0125	Gammaproteobacteria	Acinetobacter	0.081	0.485*	0.019	0.030	0.077
T3	0415	Actinobacteria	Conexibacter	0.030	0.000	0.093*	0.026	0.009
	0176	Actinobacteria	Nocardioides	0.183	0.069	0.527*	0.198	0.230
	0250	Bacteroidetes	Hymenobacter	0.000	0.035	0.239*	0.165	0.030
	0124	Bacteroidetes	Chitinophagaceae	0.139	0.054	0.258*	0.079	0.072
	0623	Bacteroidetes	Hymenobacter	0.000	0.000	0.117*	0.000	0.015
	0773	Alphaproteobacteria	Ancylobacter	0.000	0.015	0.066*	0.000	0.000
	0156	Betaproteobacteria	Methylophilus	0.025	0.024	0.179*	0.092	0.081
T4	0265	Planctomycetes	Tepidisphaera	0.010	0.000	0.007	0.381*	0.021
	0564	Planctomycetes	Unclassified	0.005	0.001	0.000	0.080*	0.000
T5	1006	Ignavibacteriae	Melioribacter	0.000	0.000	0.000	0.000	0.127*

Percent organic matter in soil: T1 (67.5%) – T2 (23.2%) – T3 (10.4%) – T4 (5.6%) – T5 (2.5%). A total of 12,204 16S rRNA gene sequences were analyzed for treatment T1, 39,556 for T2, 30,319 for T3, 23,518 for T4, and 27,428 for T5.

Significance between treatments indicated by *p < 0.05.