TABLE 1.

Relationships between phylogenetic diversity (Faith's PD) and measured soil characteristics for the full sequence set and the five most abundant phylaa

PhylumCorrelation
Soil pHSoil moisture deficitC/N ratio% OCMAT (°C)C mineralization rate (μg C-CO2 g soil−1 day−1)% Silt plus clay
Full community0.5000000
Acidobacteria0.230.04000.050.010
Actinobacteria0.310.140.010.060.010.030.03
Alphaproteobacteria0.270.080.080.040.0300
Beta/Gammaproteobacteria0.250.030.040.010.010.020.03
Bacteroidetes0.060.080.020.060.020.030
  • a Those relationships that are significant are indicated in bold. We tested three models to describe the relationships (linear, quadratic, and power), and the quadratic function provided the best fit in all cases. The relationships between Faith's PD and soil pH for the full community and the individual phyla are shown in Fig. 3A and Fig. S1 in the supplemental material.