TABLE 3.

Characteristics of grassland soils at the time of sampling (August 1998)

Sample siteSoil typebMean (SD)a
pHcMoisture content (%)Organic matter by loss on ignition (%)Total C (%)Total N (%)C/N ratioNitrification potential (μg of NO3−N g [dry wt] of soil−1 h−1)d
U4aBrown podzol3.35 (0.04)151.3 (1.2)128.7 (1.8)113.0 (3.7)10.87 (0.21)114.8 (0.50)10.70 (0.04)1
U4bHumic brown3.98 (0.19)134.2 (4.5)225.0 (4.7)111.4 (1.6)11.01 (0.11)111.2 (0.80)20.49 (0.26)1
MG6Free-draining brown earth5.35 (0.55)250.1 (4.5)127.9 (6.0)114.4 (3.7)11.16 (0.26)112.3 (0.66)22.24 (0.82)2
  • a Data are presented as means and standard deviations from three replicate plots for each grassland site. Values followed by different superscript numbers indicate significant differences between the sites at the 5% level of significance as determined by the Fisher exact test.

  • b Soil description provided by MLURI, Aberdeen, Scotland.

  • c pH of soil suspension in 0.01 M CaCl2.

  • d Nitrification potential assessed over 7 days by using the shaken soil-slurry method (7).