Table 5 Comparison of the succeeding tree species composition in the canopy (C) and extended canopy stratum (EC) in P. densiflora forests according to geographical and moisture conditions
| Â | Succeeding tree species | Northern mesic (%) | Northern dry (%) | Southern mesic (%) | Southern dry (%) | ||||
|---|---|---|---|---|---|---|---|---|---|
C (n = 70) | EC (n = 73) | C (n = 79) | EC (n = 80) | C (n = 27) | EC (n = 28) | C (n = 38) | EC (n = 39) | ||
Quercus | Quercus mongolica | 28.71 | 29.5 | 50.7 | 50.5 | 6.5 | 6.5 | 30.3 | 29.9 |
Quercus variabilis | 15.5 | 11.4 | 26.1 | 23.5 | 13.5 | 11.6 | 19.1 | 17.1 | |
Quercus serrata | 7.2 | 10.0 | 3.6 | 4.7 | 22.8 | 25.7 | 15.4 | 14.7 | |
Quercus dentata | 1.6 | 1.5 | 6.5 | 6.8 | Â | Â | 4.1 | 4.4 | |
Quercus acutissima | Â | Â | Â | Â | 2.7 | 1.8 | 7.0 | 6.2 | |
Quercus aliena | 2.0 | 2.6 | Â | Â | Â | Â | 4.1 | 5.1 | |
Subtotal | 55.0 | 55.0 | 86.9 | 85.5 | 45.5 | 45.6 | 80.0 | 77.4 | |
Others | Fraxinus rhynchophylla | 7.4 | 10.4 | 4.6 | 5.6 | Â | 0.9 | 0.7 | 1.8 |
Prunus sargentii | 5.7 | 4.4 | 3.4 | 2.5 | 4.6 | 5.7 | 3.7 | 3.1 | |
Carpinus laxiflora | 3.4 | 3.1 | 0.9 | Â | 6.9 | 5.6 | Â | Â | |
Acer pseudosieboldianum | 3.4 | 7.0 | 1.7 | 1.5 | Â | Â | Â | 0.6 | |
Betula dahurica | 3.9 | 2.5 | 0.6 | 0.6 | Â | Â | Â | Â | |
Styrax japonicus | Â | Â | Â | Â | 10.7 | 9.8 | 7.7 | 7.0 | |
Carpinus tschonoskii | Â | Â | Â | Â | 11.8 | 9.8 | 1.9 | 1.8 | |
Quercus acuta | Â | Â | Â | Â | 6.3 | 6.3 | Â | Â | |
Acer palmatum | Â | Â | Â | Â | 4.1 | 4.1 | Â | Â | |
Subtotal | 45.0 | 45.0 | 13.1 | 14.5 | 54.5 | 54.4 | 20.0 | 22.6 | |
Total | Â | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |