Table 3.
Statistical significance of exoenzyme activities (μmol mm−2 min−1) in linear regressions with soil inorganic P (Pi) and organic P (Po) content (kg ha−1), along with soil C:N and N:Pt ratios (enzymes values log-transformed, p values < 0.05 in bold).
| Soil Pi | Soil Po | Soil C:N | Soil N:Pt | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| p value | Slope | R2 | p value | Slope | R2 | p value | Slope | R2 | p value | Slope | R2 | |
| APM | 0.068 | −4.0e−4 | 0.22 | 0.477 | – | – | 0.142 | – | – | 0.123 | – | – |
| APD | 0.002 | −1.4e−3 | 0.59 | 0.165 | – | – | 0.331 | – | – | 0.017 | 3.8e−2 | 0.40 |
| LAC | 0.118 | – | – | 0.355 | – | – | 0.100 | – | – | 0.130 | – | – |
| NAG | 0.472 | – | – | 0.502 | – | – | 0.483 | – | – | 0.264 | – | – |
| GU | 0.101 | – | – | 0.240 | – | – | 0.544 | – | – | 0.062 | 1.4e−2 | 0.24 |
| X | 0.186 | – | – | 0.195 | – | – | 0.379 | – | – | 0.102 | – | – |
APM acid phosphomonoesterase, APD acid phosphodiesterase, LAC laccase, NAG N-acetyl glucosaminidase, GU β-glucosidase, X xylosidase.