Figure 1.
Figure 2.
Figure 3.
Figure 4.
Statistics of soil permeability in experimental sites_
| No TP | Age, years | Soil permeability measurement statistics | |||||
|---|---|---|---|---|---|---|---|
| N | χ | σ | m | υ | p | ||
| 1 | 8–20 | 10 | 15.5 | 5.99 | 1.89 | 38.6 | 12.2 |
| 2 | 10–25 | 10 | 19.0 | 3.92 | 1.77 | 24.1 | 5.0 |
| 3 | 10–25 | 10 | 27.3 | 9.59 | 3.03 | 35.1 | 11.1 |
| 4 | 10–25 | 10 | 21.9 | 6.63 | 2.10 | 30.2 | 9.56 |
| 5 | 15–16 | 10 | 21.6 | 5.58 | 1.76 | 25.8 | 8.17 |
| 6 | 20–25 | 10 | 19.5 | 2.75 | 0.43 | 25.5 | 5.7 |
| 7 | 20–25 | 10 | 11.1 | 2.02 | 0.64 | 18.3 | 5.7 |
| 8 | 20–25 | 10 | 18.7 | 2.92 | 0.92 | 26.1 | 9.0 |
| 9 | 20–25 | 10 | 12.6 | 2.95 | 0.93 | 23.4 | 7.39 |
| 10 | 20–25 | 10 | 10.4 | 1.42 | 0.45 | 13.7 | 4.32 |
| 11 | 10–17 | 10 | 11.6 | 1.77 | 0.56 | 15.3 | 4.84 |
| 12 | 15–20 | 10 | 26.5 | 10.15 | 3.21 | 38.3 | 12.1 |
Statistics of soil hardness in experimental sites_
| No TP | Age, years | Soil hardness measurement statistics | |||||
|---|---|---|---|---|---|---|---|
| N | χ | σ | m | ν | p | ||
| 1 | 8–20 | 15 | 18.5 | 0.88 | 0.23 | 4.74 | 1.22 |
| 2 | 10–25 | 15 | 17.8 | 1.01 | 0.26 | 5.67 | 1.46 |
| 3 | 10–25 | 15 | 17.1 | 0.76 | 0.20 | 4.45 | 1.15 |
| 4 | 10–25 | 15 | 17.5 | 0.84 | 0.22 | 4.83 | 1.25 |
| 5 | 15–16 | 15 | 17.7 | 0.98 | 0.25 | 5.52 | 1.43 |
| 6 | 20–25 | 15 | 17.8 | 0.94 | 0.24 | 5.29 | 1.36 |
| 7 | 20–25 | 15 | 18.8 | 0.84 | 0.22 | 4.47 | 1.15 |
| 8 | 20–25 | 15 | 18.1 | 0.93 | 0.24 | 5.16 | 1.33 |
| 9 | 20–25 | 15 | 18.5 | 1.09 | 0.28 | 5.92 | 1.53 |
| 10 | 20–25 | 15 | 19.0 | 0.92 | 0.22 | 4.80 | 1.13 |
| 11 | 10–17 | 15 | 18.7 | 0.49 | 0.13 | 2.63 | 0.68 |
| 12 | 15–20 | 15 | 17.4 | 0.68 | 0.16 | 3.93 | 0.90 |
Evaluation of the significance of the difference between the average values of permeability indicators_
| Pairs of test plots | Number of degrees of freedom | Student’s criterion t0,05 | Pairs of test plots | Number of degrees of freedom | Student’s criterion t0,05 |
|---|---|---|---|---|---|
| 1–9 | 16 | 1.373 | 6–9* | 16 | 5.363 |
| 2–4 | 16 | 1.191 | 5–12 | 16 | 1.338 |
| 3–7* | 16 | 5.227 | 11–12* | 16 | 4.573 |
Location and orographic characteristics of test plots_
| No TP | Geographic coordinates | Steepness of slopes % | Position on the slope | Humus horizon cm | |
|---|---|---|---|---|---|
| latitude | longitude | ||||
| 1 | 49.836796 | 31.429695 | 13–14 | medium | 16 |
| 2 | 49.836483 | 31.428675 | 8–10 | upper | 12 |
| 3 | 49.836220 | 31.427577 | 6–8 | lower | 18 |
| 4 | 49.836417 | 31.426455 | 6–8 | lower | 17 |
| 5 | 49.836582 | 31.425408 | 6–8 | lower | 16 |
| 6 | 49.837010 | 31.424439 | 7–9 | medium | 14 |
| 7 | 49.837471 | 31.423673 | 7–9 | upper | 12 |
| 8 | 49.837997 | 31.422998 | 7–9 | medium | 13 |
| 9 | 49.838524 | 31.422295 | 7–9 | upper | 12 |
| 10 | 49.838952 | 31.421530 | 7–9 | upper | 12 |
| 11 | 49.805334 | 31.389030 | 5–7 | upper | 11 |
| 12 | 49.805618 | 31.388010 | 5–7 | medium | 15 |
Evaluation of the significance of the difference between the average values of hardness indicators_
| Pairs of test plots | Number of degrees of freedom | Student’s criterion t0,05 | Pairs of test plots | Number of degrees of freedom | Student’s criterion t0,05 |
|---|---|---|---|---|---|
| 1–9 | 26 | 0 | 6–9 | 26 | 1.883 |
| 2–4 | 26 | 0.884 | 5–12 | 26 | 0.975 |
| 3–7* | 26 | 5.812 | 11–12* | 26 | 6.007 |
Biometric indicators of natural regeneration of woody plants on eroded ravine-gully lands_
| No TP | Composition | Species | Age, years | Amount, pc. | Height, m | Diameter, cm | Components and their cover, % | Index of productivity | ||
|---|---|---|---|---|---|---|---|---|---|---|
| undergrowth | understory | grass cover | ||||||||
| 1 | 9Cb1Pt+Sa | Carpinus betulus | 8–20 | 22 | 8.1 | 3.6 | 10 | 3 | 0 | Ia |
| Salix caprea | 1 | 9.0 | 10.0 | Ia | ||||||
| Populus tremula | 3 | 11.3 | 8.7 | Ia | ||||||
| 2 | 10Bp | Betula pendula | 10–25 | 54 | 5.2 | 9.0 | 15 | 5 | 0 | III |
| 3 | 6Pt4Bp+Cb, Fe | Populus tremula | 10–25 | 13 | 13.6 | 14.3 | 18 | 7 | 3 | Ia |
| Betula pendula | 10 | 7.2 | 5.6 | II | ||||||
| Carpinus betulus | 1 | 6.0 | 6.0 | Ia | ||||||
| Fraxinus excelsior | 1 | 6.0 | 4.0 | Ia | ||||||
| 4 | 10Bp+Pt, Sc | Betula pendula | 10–25 | 23 | 10.4 | 7.0 | 10 | 10 | 80 | Ia |
| Populus tremula | 1 | 6.5 | 6.0 | Ia | ||||||
| Salix caprea | 1 | 8.0 | 18.0 | I | ||||||
| 5 | 9Ps1Rp | Pinus sylvestris | 15–16 | 38 | 4.1 | 6.4 | 20 | 15 | 65 | Ia |
| Robinia pseudoacacia | 6 | 3.5 | 8.0 | Ia | ||||||
| 6 | 9Rp1Bp+Pc, Pt | Robinia pseudoacacia | 20–25 | 15 | 7.6 | 11.9 | 6 | 3 | 40 | III |
| Pyrus communis | 1 | 3.5 | 6.0 | V | ||||||
| Betula pendula | 2 | 6.3 | 9.0 | III | ||||||
| Populus tremula | 2 | 10.5 | 20.0 | I | ||||||
| 7 | 6Pt1Ps3Bp | Populus tremula | 20–25 | 8 | 11 | 12.8 | 15 | 0 | 10 | II |
| Pinus sylvestris | 1 | 8.0 | 14.0 | II | ||||||
| Betula pendula | 4 | 7.9 | 8.0 | II | ||||||
| 8 | 6Bp1Pt3Rp | Betula pendula | 20–25 | 8 | 10.2 | 12.3 | 5 | 9 | 100 | II |
| Populus tremula | 2 | 12.5 | 15.0 | I | ||||||
| Robinia pseudoacacia | 4 | 6.0 | 7.0 | III | ||||||
| 9 | 10Rp+Pa, Ps | Robinia pseudoacacia | 20–25 | 13 | 4.2 | 4.5 | 6 | 0 | 100 | IV |
| Populus alba | 1 | 13.0 | 22.0 | Ia | ||||||
| Pinus sylvestris | 1 | 5.5 | 22.0 | IV | ||||||
| 10 | 6Rp1Ps3Pt | Robinia pseudoacacia | 20–25 | 8 | 8.9 | 8.5 | 8 | 0 | 100 | II |
| Pinus sylvestris | 2 | 6.0 | 6.0 | III | ||||||
| Populus tremula | 5 | 9.1 | 7.6 | II | ||||||
| 11 | 10Ps | Pinus sylvestris | 10–17 | 56 | 5.1 | 5.9 | 0 | 0 | 0 | IV |
| 12 | 10Ps | Pinus sylvestris | 15–20 | 33 | 6.0 | 7.5 | 0 | 0 | 20 | III |