TABLE 2.

Plate counts of bacterial heterotrophs and the quantity of DNA extracted from soil in four environments at three soil depths

LocationSoil depth (cm)Bacterial count (105 CFU/g of soil)aAmt of extracted DNA (μg/0.5 cm3 of soil)
Stipa 0-1073 (43) A2.5
10-2019 (14) AB2.0
20-3013 (9) B1.5
Hilaria 0-10105 (25) A2.5
10-2033 (10) AB1.5
20-3016 (14) B0.35
Bromus 0-1096 (60) A2.5
10-2055 (25) AB1.5
20-308 (7) B0.25
Interspace0-1051 (12) A0.80
10-2044 (39) AB0.35
20-3019 (26) B0.10
  • a Bacterial heterotrophs were cultured on 1/10× TSB medium. Bacterial counts are averages of three plates per dilution per field sample × three field samples = nine observations. Standard deviations of the means are shown in parentheses. Bacterial counts followed by the same letter are not significantly different (P = 0.05) by Tukey's Studentized t test.