Table 1.
Results of partial least squares regressions for soil biota against soil properties for richness
| Soil and environmental variables | Taxon | ||||
|---|---|---|---|---|---|
| Bacteria | Archaea | Fungi | Protists | Animals | |
| Total Ca |
1.14
(R2 = 0.44***) |
1.21
(R2 = 0.13***) |
0.44 |
1.3
(R2 = 0.35***) |
0.9 |
| Total Na | 0.93 | 0.89 | 0.93 | 0.8 | 1.18 |
| C:N ratiob |
1.45
(R2 = 0.41***) |
1.31
(R2 = 0.09***) |
1.64
(R2 = 0.28***) |
1.67
(R2 = 0.35***) |
0.1 |
| Total P (mg kg−1)b | 0.35 | 0.59 | 0.7 | 0.85 | 0.67 |
| Organic matter (% LOI)a |
1.47
(R2 = 0.5***) |
1.27
(R2 = 0.14***) |
1.13
(R2 = 0.29***) |
1.27
(R2 = 0.35***) |
1.08 |
| pH (CaCl2) |
1.98
(R2 = 0.51***) |
1.68
(R2 = 0.25***) |
1.52
(R2 = 0.23***) |
1.56
(R2 = 0.33***) |
0.9 |
| Soil water repellencya,c |
1.31
(R2 = 0.2***) |
0.9 |
1.23
(R2 = 0.13***) |
0.93 | 0.98 |
| Volumetric water content (m3 m3 −1) | 0.36 |
1.33
(R2 = 0.13***) |
0.6 | 0.41 | 0.4 |
| Soil bound water (g water g dry soil−1) |
1.25
(R2 = 0.41***) |
0.83 |
1.08
(R2 = 0.26***) |
1.23
(R2 = 0.31***) |
0.63 |
| Rock volume (mL) | 0.25 | 0.61 | 0.64 | 0.27 | 1.3 |
| Bulk density (g cm3 −1) |
1.39
(R2 = 0.44***) |
1.43
(R2 = 0.18***) |
1.41
(R2 = 0.29***) |
1.5
(R2 = 0.35***) |
1.39 |
| Clay content (%)d | 0.85 |
1.19
(R2 = 0.1***) |
0.84 |
1.14
(R2 = 0.09***) |
0.05 |
| Sand content (%)d | 0.45 | 0.16 | 0.6 | 0.51 | 0.78 |
| Elevation (m) |
1.66
(R2 = 0.42***) |
1.7
(R2 = 0.27***) |
1.68
(R2 = 0.22***) |
1.65
(R2 = 0.36***) |
0.57 |
| Mean annual precipitation (mL) |
1.08
(R2 = 0.25***) |
1.75
(R2 = 0.3***) |
1.44
(R2 = 0.18***) |
1.48
(R2 = 0.27***) |
0.46 |
| Temperature (°C) | 0.51 | 0.5 | 0.56 | 0.58 | 0.35 |
| Collembolae | 0.34 | 0.06 | 0.41 | 0.17 |
1.14
(R2 = 0.03***) |
| Mitese | 0.49 | 0.2 |
1.17
(R2 = 0.03***) |
0.23 |
1.74
(R2 = 0.08***) |
| Total mesofaunae | 0.44 | 0.1 |
1.03
(R2 = 0.01*) |
0.15 |
1.71
(R2 = 0.08***) |
Positive relationships are written in bold and negative relationships are written in italics
aLog10-transformation
bSquare-root-transformation
cSoil water repellency was derived from median water drop penetration times (s)
dAitchison’s log-ratio transformation
eLog10 plus 1 transformation
***p < 0.001; **0.001 > p < 0.01; *0.01 > p < 0.05, and blank indicates p > 0.05