Table 1. Root system index of P. sylvestris var. mongolica seedlings after different drought stress treatments. (LenPerVol: total root length per unit soil volume).
| Drought intensity Treatments (T) | Length (cm) | Surface area (cm2) | Root volume (cm3) | Average diameter (mm) | LenPerVol (cm/m3) | Tips | Forks | Crossings |
|---|---|---|---|---|---|---|---|---|
| CK | 898.19 ± 11.72a | 575.41 ± 9.18a | 34.06 ± 0.88a | 2.88 ± 0.3a | 888.85 ± 17.17a | 4,332 ± 105a | 9,324 ± 250a | 1,116 ± 64a |
| MD | 810.17 ± 30.26a | 537.33 ± 7.81b | 29.61 ± 0.85b | 2.53 ± 0.12a | 763.50 ± 27.32b | 3,968 ± 126a | 7,919 ± 186b | 912 ± 36b |
| HD | 647.75 ± 35.62b | 524.27 ± 2.03b | 21 ± 0.32c | 1.90 ± 0.18b | 677.42 ± 16.08b | 3,534 ± 160b | 7,192 ± 121b | 785 ± 14b |
Notes.
The lowercase letters indicate the significant (p < 0.05) differences among different treatment times subjected to the same species. Error bars are ±SD (n = 3).