Table 3 General linear model analysis for a mixed model nested ANOVA-type design, testing for the effects of forest type and site as fixed factors, and replica as random factor, on the chemical parameters of Nothofagus forest mineral soils. SOM= soil organic matter concentration, SOC soil organic carbon concentration, N nitrogen concentration, P phosphorus concentration, C/N carbon/nitrogen ratio, C/P carbon/phosphorus ratio, CEC cation exchange capacity, pH. P, CEC and pH were transformed by log (Y) to accomplish assumptions, but not transformed averages are presented in the table. F (p) Fisher statistic with probability in parentheses. Different letters show differences by Tukey test at p <0.05.
Main factors | SOM (%) | SOC (%) | N (%) | P (ppm) | C/N | C/P | CEC (meq 100 g−1) | pH | |
|---|---|---|---|---|---|---|---|---|---|
Forest type | Np | 16.8 | 9.75 | 0.81 | 35.54 | 12.05 | 195.2 | 34.46 b | 4.9 c |
M | 15.85 | 9.19 | 0.73 | 16.64 | 12.42 | 148.7 | 31.07 ab | 4.3 b | |
Nb | 17.01 | 9.87 | 0.81 | 15.25 | 12.13 | 165.3 | 28.70 a | 3.7 a | |
Site | COA | 14.88 | 8.63 | 0.70 | 36.82 b | 12.37 | 58.2 a | 25.32 a | 4.1 a |
MOU | 18.22 | 10.57 | 0.88 | 8.13 a | 12.04 | 281.2 b | 37.51 b | 4.5 b | |
Tested effects | |||||||||
Forest type | F(p) | 0.23 (0.808) | 0.23 (0.806) | 0.35 (0.727) | 3.91 (0.114) | 3.58 (0.129) | 0.03 (0.970) | 8.63 (0.035*) | 124.22 (<0.001*) |
Site | F(p) | 4.92 (0.091) | 4.87 (0.091) | 6.89 (0.058) | 18.52 (0.013)* | 7.46 (0.052) | 16.16 (0.016*) | 114.18 (<0.001*) | 28.18 (0.006*) |
Forest type × Site | F(p) | 0.55 (0.614) | 0.54 (0.621) | 1.06 (0.428) | 2.67 (0.183) | 2.78 (0.175) | 1.74 (0.286) | 0.00 (0.999) | 16.33 (0.012*) |
Forest type × Replica (Site) | F(p) | 0.51 (0.730) | 0.51 (0.727) | 0.49 (0.740) | 1.97 (0.114) | 0.56 (0.694) | 3.66 (0.012*) | 0.14 (0.967) | 0.25 (0.908) |