Mean height increases of seven tree species over time growing with (+) and without (-) treeshelters, (n=8 for 3- and 6-month data, n=20 for 1-year data, n=10 for 2-year data)
Species | Mean Height increase (cm) | |||||||
---|---|---|---|---|---|---|---|---|
3 months | 6 months | 1 year | 2 years | |||||
- | + | - | + | - | + | - | + | |
Fraxinus latifolia | 27 b | 44 a | ---- | ---- | 162 a | 197 a | 238 a | 233 a |
Ginkgo biloba | 0 a | 0.3 a | 1.5 a | 4.4 a | 13 a | 18 a | 34 a | 51 a |
Lagerstroemia indica | 27 b | 76 a | 30 b | 76 a | 30 b | 137 a | 98 b | 160 a |
Platanus racemosa | 38 b | 64 a | ---- | ---- | 134 a | 173 a | 330 a | 308 a |
Quercus agrifolia | 16 b | 51 a | 27 b | 78 a | 57 b | 144 a | 172 a | 191 a |
Quercus lobata | 9 b | 31 a | 19b | 53 a | 71 b | 200 a | 233 a | 261 a |
Sequoia sempervirens | 11 b | 25 a | 12 b | 38 a | 85 a | 68 a | 123 b | 213 a |
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.