| Tree Species | Second-growth | Old-growth |
| ||
|
| Mean (stems/ha) | Std. error | Mean (stems/ha) | Std. error | t-test p = |
| Acer macrophyllum | 0.00 | 0.00 | 2.39 | 2.02 | 0.240 |
| Aesculus californica | 3.58 | 2.65 | 0.00 | 0.00 | 0.179 |
| Arbutus menziesii | 14.71 | 3.48 | 1.19 | 0.68 | 0.000 |
| Corylus cornuta var. californica | 3.58 | 1.96 | 0.80 | 0.56 | 0.174 |
| Notholithocarpus densiflorus | 197.16 | 33.67 | 674.56 | 73.10 | 0.000 |
| Pseudotsuga menziesii | 13.52 | 4.03 | 69.96 | 18.12 | 0.003 |
| Quercus wislizenii | 52.07 | 12.45 | 6.36 | 1.99 | 0.000 |
| Sequoia sempervirens | 674.56 | 44.51 | 515.16 | 85.63 | 0.101 |
| Umbellularia californica | 12.72 | 5.14 | 37.37 | 10.07 | 0.031 |