Table 3 Summary of analyses of variance showing the mean squares for estimated volume before and after the second thinning operation in two under-canopy vegetation control pine trials in South Africa
From: Impacts of under-canopy vegetation on stand growth in two pine saw-timber stands, South Africa
Dargle (P. patula) | Kwambonambi (P. tecunumanii) | ||||||
|---|---|---|---|---|---|---|---|
Source of variation | df | Volume (m3 ha−1) | Source of variation | df | Volume (m3 ha−1) | ||
Before thinning | After thinning | Before thinning | After thinning | ||||
Row | 4 | 1346.2 | 669.0 | Rep | 5 | 962.0 | 774.6 |
Columns | 4 | 1375.3 | 668.5 | Treatment | 4 | 1452.0ns | 776.0ns |
Treatment | 4 | 900.8ns | 633.8ns | Residual | 20 | 1425.0 | 392.7 |
Residual | 12 | 974.8 | 611.9 | Total | 29 | ||
Total | 24 | ||||||
Summary of data | Summary of data | ||||||
Grand mean | 257.8 | 187.7 | Grand mean | 321.7 | 251.2 | ||
Coefficient of variation (units) | 12.1 | 13.2 | Coefficient of variation (units) | 11.7 | 7.9 | ||
Standard error of the difference | 19.8 | 15.7 | Standard error of the difference | 21.8 | 11.4 | ||
Shapiro-Wilk test for normality | 0.94ns | 0.98ns | Shapiro-Wilk test for normality | 0.98ns | 0.97ns | ||
Bartlett’s test for homogeneity of variance (Chi-square for 4 df) | 2.80ns | 4.11ns | Bartlett’s test for homogeneity of variance (Chi-square for 4 df) | 3.37ns | 2.87ns | ||