. Author manuscript; available in PMC: 2012 Jan 30.

Published in final edited form as: Environ Pollut. 2010 Nov 27;159(2):401–407. doi: 10.1016/j.envpol.2010.10.033

Table 3.

Total bacterial abundance (16S rRNA gene copies per gramof soil) under elevated CO₂ and O₃ treatments during the 2008 growing season at three sampling times (V4 = Fourth trifoliate leaf; R4=Full pod;R8 = Full maturity). Values are means with standard errorsinparentheses. Means withina column followed bythe same lowercase letterorwithin a row followed by the same uppercase letter are not significantly different (P > 0.05).

	16S rRNA (copies g⁻¹ soil)
	V4	R4	R8
Ambient	1.7 × 10⁸ (1.8 × 10⁷) Bb	2.2 × 10⁸ (1.9 × 10⁷) Aa	2.4 × 10⁸ (3.2 × 10⁷) Ab
CO₂	1.8 × 10⁸ (1.8 × 10⁷) Bb	1.9 × 10⁸ (1.9 × 10⁷) Ba	3.0 × 10⁸ (3.3 × 10⁷) Aab
O₃	2.2 × 10⁸ (1.6 × 10⁷) Aa	2.3 × 10⁸ (1.1 × 10⁷)Aa	2.8 × 10⁸ (1.8 × 10⁷) Aab
CO₂ + O₃	2.3 × 10⁸ (1.7 × 10⁷) Ba	2.2 × 10⁸ (1.3 × 10⁷) Ba	3.2 × 10⁸ (2.6 × 10⁷) Aa