Table 3. 3-factor ANOVA (analysis of variance) results for dark and light chamber NH4 + flux and NH4 + uptake.
| Variable | Source | d.f. | MS | F | p | Significant Tukey post-hoc test | ||
| Site | Season | Treatment | ||||||
| Log10 Dark NH4 + | Site | 1 | 0.464 | 16.4 | < 0.001 | |||
| Season | 1 | 1.24 | 44.0 | < 0.001 | ||||
| Treatment | 1 | 1.52 | 53.7 | < 0.001 | +AS>–AS | |||
| Site*Season | 1 | 0.161 | 5.70 | 0.029 | Wi: Sd<Ms | Sd & Ms: Wi<Su | ||
| Site* Treatment | 1 | 0.105 | 3.72 | 0.071 | ||||
| Season* Treatment | 1 | 0.078 | 2.75 | 0.116 | ||||
| Error | 17 | 0.028 | ||||||
| Light NH4 + | Site | 1 | 7190 | 15.3 | 0.001 | |||
| Season | 1 | 172 | 0.366 | 0.554 | ||||
| Treatment | 1 | 3850 | 8.19 | 0.011 | ||||
| Site*Season | 1 | 58.7 | 0.125 | 0.728 | ||||
| Site* Treatment | 1 | 3470 | 7.39 | 0.015 | ||||
| Season* Treatment | 1 | 2.55 | 0.005 | 0.942 | ||||
| Site*Season*Treatment | 1 | 2290 | 4.88 | 0.042 | +AS Su: Sd<Ms | Ms Su: +AS>–AS | ||
| Error | 16 | 470 | ||||||
| NH4 + uptake | Site | 1 | 1430 | 2.28 | 0.151 | |||
| Season | 1 | 13400 | 21.4 | < 0.001 | ||||
| Treatment | 1 | 2950 | 4.69 | 0.046 | ||||
| Site*Season | 1 | 66.0 | 0.110 | 0.749 | ||||
| Site* Treatment | 1 | 3980 | 6.32 | 0.023 | ||||
| Season* Treatment | 1 | 1320 | 2.09 | 0.168 | ||||
| Site*Season* Treatment | 1 | 4990 | 7.92 | 0.012 | +AS Su: Sd>Ms | +AS Sd: Wi<Su | Sd Su: +AS>–AS | |
| Error | 16 | 629 | ||||||
Factors are site (Sd = Sandy, Ms = Muddy-sand), season (Wi = Winter, Su = Summer) and treatment (+AS = Austrovenus addition, –AS = Austrovenus removal). Values in bold are significant at p<0.05. Tukey post-hoc tests for significant differences between site, season and treatment are shown at α = 0.05.
Dark NH4 + flux was log10 transformed prior to analysis.