Root dry mass over time and final root-shoot ratios of seven tree species growing with (+) and without (–) treeshelters. Some roots <1 cm in diameter remained in the soil after root system excavation, (n=8 for 3- and 6-month data, n=20 for 1-year data, n=10 for 2-year data)
Species | Root Dry Mass (g) | |||||||
---|---|---|---|---|---|---|---|---|
3 months | 1 year | 2 years | Root:Shoot (dry mass basis) | |||||
- | + | - | + | - | + | - | + | |
Fraxinus iatifoiia | 46.3 a | 17.8 b | 259 a | 147 b | 1473 a | 1051 b | 0.45 a | 0.46 a |
Ginkgo biloba | 5.3 a | 4.0 b | 6a | 4 a | 34 a | 18 b | 1.47 a | 1.06 b |
Lagerstroemia indica | 13.3a | 11.3a | 39 a | 28 b | 1574 a | 180 b | 2.52 a | 0.28 b |
Platanus racemosa | 40.7 a | 27.3 b | 673 a | 287 b | 2394 a | 1561 b | 0.26 a | 0.38 a |
Quercus agrifolia | 12.2 a | 8.4 a | 43 a | 40 a | 165 a | 135 a | 0.24 a | 0.25 a |
Quercus lobata | 12.5 a | 13.8 a | 91 a | 66 b | 664 a | 316 b | 0.49 a | 0.34 b |
Sequoia sempervirens | 7.3 a | 4.0 a | 64 a | 15 b | 404 a | 37 b | 0.36 a | 0.03 b |
Values followed by the same letter for each time period are not significantly different from one another at p=0.05 using Scheffe’s multiple separation procedure.