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. 2006 Sep;72(9):5957–5962. doi: 10.1128/AEM.00439-06

TABLE 2.

Copy numbers of the 16S rRNA and the narG, nirK, nirS, and nosZ genes from different successional stages

Sampling mo Successional age (yr) No. of gene copies (g−1 of soil)a
16S rRNA narG nirK nirS nosZ
August 25 3.4 × 109 A 1.6 × 108 A 7.7 × 106 A 1.9 × 107 A 1.3 × 107 A
40 7.0 × 109 A 1.7 × 108 A 1.1 × 107 A 2.2 × 107 A 3.7 × 107 A
44 1.9 × 1010 A 1.4 × 108 A 2.2 × 107 AB 1.1 × 108 A 5.1 × 107 A
72 1.6 × 1010 A 7.7 × 107 A 2.9 × 107 B 4.9 × 106 A 1.2 × 108 A
129 4.2 × 1010 B 1.1 × 108 A 5.7 × 107 C 3.1 × 107 A 2.8 × 108 B
September 25 4.0 × 109 A 1.9 × 108 A 8.9 × 106 A 5.6 × 107 A 1.4 × 107 A
40 6.2 × 109 A 1.9 × 108 A 1.0 × 107 A 2.4 × 107 A 5.3 × 107 A
44 9.8 × 109 A 1.2 × 108 A 1.4 × 107 A 3.8 × 107 A 2.3 × 107 A
72 1.1 × 1010 A 1.2 × 108 A 2.4 × 107 AB 1.8 × 107 A 7.1 × 107 A
129 2.1 × 1010 B 1.1 × 108 A 3.2 × 107 B 7.6 × 107 A 1.3 × 108 B
a

Suffix letters (A to C) indicate significant differences between successional stages.