Appendix E (TABLE E1). A table showing measures of phylogenetic diversity (PD), and PD change over time, at three taxonomic scales for forest tree seedlings < 2.54 cm dbh on Forest Inventory and Analysis plots in the northern and southern zones.
| Northern seedlings | Southern seedlings | ||||||||||
| N |
Mean PD Time 2 |
Mean PD Time 1 |
Mean PD T2-T1 |
P | N |
Mean PD Time 2 |
Mean PD Time 1 |
Mean PD T2-T1 |
P | ||
|
(a) Plant divisions |
Angiosperms | 3,800 | 532.41 | 535.21 | -2.80 | 0.085 | 2,224 | 785.91 | 743.85 | 42.06 | < 0.001 |
| Gymnosperms | 2,528 | 392.98 | 405.37 | -12.39 | < 0.001 | 1,115 | 280.59 | 292.72 | -12.12 | 0.054 | |
|
(b) Common families |
Betulaceae | 1,635 | 244.45 | 264.74 | -20.29 | 0.001 | 508 | 271.28 | 218.46 | 52.82 | < 0.001 |
| Juglandaceae | 231 | 264.05 | 256.23 | 7.82 | 0.63 | 970 | 273.52 | 255.65 | 17.86 | 0.004 | |
| Pinaceae | 2,495 | 367.32 | 380.20 | -12.88 | < 0.001 | 876 | 242.68 | 278.11 | -35.42 | < 0.001 | |
| Rosaceae | 2,047 | 281.08 | 233.26 | 47.82 | < 0.001 | 981 | 248.24 | 231.19 | 17.05 | 0.053 | |
|
(c) Common genera |
Acer | 2,737 | 285.90 | 306.02 | -20.13 | < 0.001 | 1,403 | 286.29 | 273.50 | 12.79 | 0.004 |
| Pinus | 608 | 261.29 | 296.98 | -35.68 | < 0.001 | 859 | 238.05 | 275.50 | -37.45 | < 0.001 | |
| Quercus | 1,214 | 248.53 | 281.99 | -33.45 | < 0.001 | 1,740 | 302.09 | 295.11 | 6.99 | 0.002 | |
Notes: PD is measured in millions of years per plot. Significant measures of mean plot-level change over time, based on a Wilcoxon signed rank test, are in bold.