Table 2. Effects of land use type, soil depth, and their interactions on soil aggregate stability indexes, soil particle distribution, SOC content, and the K factor.
Two-way ANOVA analysis with LSD test; “ns” means no-significant differences.
| Factor | Variable | Type III sum of squares | df | Mean square | F | Sig. |
|---|---|---|---|---|---|---|
| Soil depth | WSMacA | 1035.380 | 5 | 207.076 | 1.324 | 0.265 ns |
| MWD | 0.114 | 5 | 0.023 | 1.271 | 0.287 ns | |
| GMD | 0.225 | 5 | 0.045 | 1.840 | 0.117 ns | |
| AR | 129.819 | 5 | 25.964 | 2.891 | 0.020 | |
| SOC | 65.660 | 5 | 13.132 | 8.048 | 0.000 | |
| Clay | 10.926 | 5 | 2.185 | 0.312 | 0.904 ns | |
| Silt | 15.309 | 5 | 3.062 | 0.410 | 0.840 ns | |
| K factor | 0.000 | 5 | 0.000 | 10.369 | 0.000 | |
| Land use type | WSMacA | 1,894.041 | 2 | 947.021 | 6.056 | 0.004 |
| MWD | 0.202 | 2 | 0.101 | 5.616 | 0.006 | |
| GMD | 0.267 | 2 | 0.134 | 5.468 | 0.006 | |
| AR | 206.646 | 2 | 103.323 | 11.505 | 0.000 | |
| SOC | 2.960 | 2 | 1.480 | 0.907 | 0.409 ns | |
| Clay | 29.077 | 2 | 14.539 | 2.077 | 0.133 ns | |
| Silt | 23.003 | 2 | 11.501 | 1.539 | 0.222 ns | |
| K factor | 0.000 | 2 | 0.000 | 0.358 | 0.700 ns | |
| Soil depth × Land use type | WSMacA | 806.588 | 9 | 89.621 | 0.573 | 0.814 ns |
| MWD | 0.094 | 9 | 0.010 | 0.578 | 0.811 ns | |
| GMD | 0.199 | 9 | 0.022 | 0.904 | 0.527 ns | |
| AR | 80.510 | 9 | 8.946 | 0.996 | 0.452 ns | |
| SOC | 8.795 | 9 | 0.977 | 0.599 | 0.793 ns | |
| Clay | 28.721 | 9 | 3.191 | 0.456 | 0.899 ns | |
| Silt | 27.619 | 9 | 3.069 | 0.411 | 0.925 ns | |
| K factor | 0.000 | 9 | 0.000 | 0.384 | 0.939 ns |