Table 4

Spearman's rank correlation coefficient rho of OTUs with more than 20 sequences across all six clone libraries with soil and site characteristicsa

CharacteristicOTU7, Gp1OTU94, Gp1OTU32, Gp1OTU119, Gp1OTU2, Gp1OTU3, Gp5OTU15, Gp5OTU9, Gp6OTU115, Gp6OTU6, Gp6OTU92, Gp6OTU45, Gp6OTU99, Gp6
pH−0.84−0.88−0.88−0.88−0.900.03−0.37−0.640.97**0.260.880.900.75
Phosphorus−0.99***−0.94*−0.94*−0.94*−0.93*0.460.03−0.290.880.710.94*0.810.70
Corg/N ratio0.900.94*0.94*0.94*0.84−0.120.280.58−0.97**−0.37−0.94*−0.99***−0.67
Soil moisture−0.74−0.62−0.62−0.62−0.590.880.610.340.510.99***0.620.430.31
Soil temp−0.32−0.46−0.46−0.46−0.38−0.73−0.93*−0.99***0.50−0.490.460.610.46
Soil respiration−0.58−0.70−0.70−0.70−0.64−0.46−0.77−0.93*0.71−0.200.700.750.70
Amoebae−0.99***−0.94*−0.94*−0.94*−0.93*0.32−0.12−0.440.97**0.600.94*0.93*0.61
No. of vascular plant species−0.22−0.12−0.12−0.12−0.130.96*0.94*0.790.060.810.12−0.070.02
Ammonium0.93*0.880.880.880.99***−0.380.060.35−0.88−0.60−0.88−0.73−0.78
Nitrate−0.75−0.88−0.88−0.88−0.810.12−0.22−0.490.790.260.880.730.99***
  • a Only OTUs with significant (*, P < 0.05; **, P < 0.01; ***, P < 0.001) correlations are shown in bold. P values have been adjusted for multiple comparisons by the FDR approach. Organic carbon and nitrogen content and abundances of flagellates and ciliates were included in the calculations but did not show any significant correlations and, therefore, have been excluded from the table.