PAH+, HK44+ PAH–, HK44+ PAH+, HK44–
  Level L1 L2 L4 L3 L5 L6
Chao1 OTU* 1999
(1675, 2429)**		 1666
(1390, 2038)		 1441
(1222, 1737)		 1343
(1141, 1617)		 1477
(1250, 1784)		 1954
(1640, 2372)
Genus 137
(108, 218)		 115
(98, 161)		 95
(86, 121)		 123
(95, 199)		 109
(96, 147)		 122
(101, 179)
Inverse Simpsons Diversity OTU* 18.43
(17.18, 19.90)		 15.12
(14.14, 16.25)		 17.80
(16.62, 19.16)		 7.54
(6.99, 8.18)		 17.42
(15.96, 19.17)		 19.20
(17.86, 20.77)
Genus 6.76
(6.42, 7.15)		 8.67
(8.26, 9.13)		 9.77
(9.36, 10.21)		 6.07
(5.72, 6.47)		 8.55
(8.13, 9.01)		 10.52
(10.06, 11.03)
*97% 16S rRNA gene similarity
**Lower and upper 95% confidence limits
Table 2: Chao1 richness estimates and Simpson’s Diversity Index of the combined libraries for each lysimeter (n=3564 sequences in each library), classified by 97% similarity (OTU) or genus-level taxonomic classification.