Table 1.

Estimation of the total and taxon-specific relative bacterial rRNA contents of soil

PlotYears without fertilizationConcn ofBacteria rRNA (μg g of soil−1)aRelative rRNA yield (% of EUB338 probe yield)
α-ProteobacteriaLow-G+C-content FirmicutesHigh-G+C-content Firmicutes
199701.1 (0.3)b18.2 (11.4)47.1 (14.4)13.1 (2.6)
199162.5 (0.6)19.2 (8.2)56.6 (2.9)22.4 (3.1)
199071.6 (0.5)29.4 (6.1)40.0 (5.4)14.9 (2.8)
1985121.7 (0.4)26.1 (5.2)44.3 (11.2)20.6 (4.2)
1972251.1 (0.5)20.0 (4.0)53.0 (7.5)25.4 (9.0)
1967301.3 (0.2)20.8 (5.4)50.3 (15.3)18.6 (7.7)
  • a Determined with probe EUB338.

  • b The values in parentheses are standard deviations (n = 4).