Table 4 Average changes in soil physical properties (%) compared to undisturbed area following 20 (a) and 40 (b) skidding passes for various distance from edge of skid trail and slopes categories
(a) | |||||||||||||||
Slope (%) | |||||||||||||||
Distance zone (m) | 0–10 | 10–20 | >20 | ||||||||||||
DB | TP | MP | MIP | VR | DB | TP | MP | MIP | VR | DB | TP | MP | MIP | VR | |
0.5 | 11.4 | −4.2 | −19.1 | 12.6 | −12.7 | 31.4 | −7.6 | −28.7 | 16.4 | −22.1 | 31.4 | −11.8 | −41.8 | 22.3 | −31.9 |
1.00 | 1.4 | −0.9 | −3.6 | 2.0 | −1. 5 | 21.4 | −5. 5 | −14.4 | 5.7 | −14.5 | 35.7 | −5.0 | −14.0 | 5.2 | −23.6 |
1.50 | 1.4 | −0.7 | −2.3 | 1.1 | −0.7 | 17.1 | −3.9 | −11.0 | 4.27 | −11.6 | 26.1 | −2.8 | −7.7 | 2.8 | −19.9 |
2.00 | 0.0 | −0.5 | −1.6 | 0.6 | 0.0 | 1.4 | −1.1 | −1.0 | −1.4 | −2.2 | 8.5 | −0.8 | −2.1 | 0.7 | −1.5 |
(b) | |||||||||||||||
Slope (%) | |||||||||||||||
Distance (m) | 0–10 | 10–20 | >20 | ||||||||||||
DB | TP | MP | MIP | VR | DB | TP | MP | MIP | VR | DB | TP | MP | MIP | VR | |
0.5 | 20.0 | −13.4 | −58.6 | 38.1 | −35.9 | 37.1 | −17.0 | −68.7 | 40.5 | −32.3 | 41.4 | −18.7 | −76.7 | 50.2 | −39.5 |
1.00 | 12.9 | −11.3 | −47.1 | 29.7 | −31.2 | 30.0 | −8.9 | −44.1 | 31.2 | −35.1 | 38.6 | −15.4 | −62.3 | 38.1 | −37.7 |
1.50 | 10.0 | −5.9 | −20.2 | 10.4 | −28.3 | 27.1 | −7.1 | −17.6 | 4.9 | −27.9 | 34.3 | −14.5 | −54.8 | 30.6 | −34.1 |
2.00 | 2.9 | −4.2 | −14.3 | 7.1 | −12.7 | 11.4 | −5.4 | −11.8 | 1.7 | −10.5 | 30.0 | −11.5 | −43.0 | 24.4 | −30.4 |