Table 2.
Composition and importance value (IV) index of the tree species in different development stages in an old-growth oak broad-leaved mixed forest
| Species | Family | Density (trees ha−1) | Importance value (%) | |||
|---|---|---|---|---|---|---|
| Juvenile | Medium | Large | All | |||
| Quercus aliena var. acutiserrata Maxim | Fagaceae | 190.82 | 4.79 ± 0.08 | 31.57 ± 0.18 | 50.7 ± 0.28 | 27.13 ± 0.1 |
| Acer caesium subsp. giraldii (Pax) E.Murr | Aceraceae | 137.76 | 25.5 ± 0.17 | 13.75 ± 0.14 | 4.59 ± 0.16 | 13.6 ± 0.08 |
| Ulmus propinqua Koidz | Ulmaceae | 77.55 | 0.72 ± 0.03 | 12.04 ± 0.15 | 20.79 ± 0.25 | 12.56 ± 0.09 |
| Cerasus polytricha (Koehne) Yü et Li | Rosaceae | 60.2 | 9.94 ± 0.11 | 6.26 ± 0.1 | – | 5.58 ± 0.05 |
| Symplocos paniculata (Thunb.) Miq. | Symplocaceae | 58.16 | 14.47 ± 0.13 | 0.54 ± 0.04 | – | 4.81 ± 0.04 |
| Acer ginnala Maxim. | Aceraceae | 57.14 | 6.66 ± 0.1 | 8.46 ± 0.12 | 1.93 ± 0.06 | 6.67 ± 0.05 |
| Pinus armandii Franch. | Pinaceae | 56.12 | 7 ± 0.11 | 7.07 ± 0.09 | 2.62 ± 0.07 | 6.18 ± 0.06 |
| Crataegus kansuensis Wils | Rosaceae | 47.96 | 14.73 ± 0.14 | 0.39 ± 0.02 | – | 4.7 ± 0.04 |
| Malus hupehensis (Pamp.) Rehd | Rosaceae | 32.65 | 1.21 ± 0.04 | 5.19 ± 0.1 | 3.93 ± 0.12 | 3.73 ± 0.05 |
| Toxicodendron vernicifluum (Stokes) F. A. Barkl. | Anacardiaceae | 22.45 | 0.89 ± 0.04 | 4.55 ± 0.08 | 0.56 ± 0.03 | 2.6 ± 0.04 |
| Quercus wutaishanica Blume | Fagaceae | 18.37 | 0.23 ± 0.02 | 2.52 ± 0.07 | 3.32 ± 0.1 | 2.95 ± 0.06 |
| Tilia paucicostata Maxim | Tiliaceae | 12.24 | 0.88 ± 0.03 | 0.77 ± 0.03 | 0.74 ± 0.03 | 0.98 ± 0.02 |
| Acer cappadocicum Gled | Aceraceae | 11.22 | 1.04 ± 0.04 | 1.13 ± 0.03 | – | 0.72 ± 0.02 |
| Lindera obtusiloba Bl. | Lauraceae | 11.22 | 1.66 ± 0.05 | 0.83 ± 0.03 | – | 0.87 ± 0.02 |
| Acer davidii Franch. | Aceraceae | 10.2 | 1.17 ± 0.04 | 1.08 ± 0.03 | – | 0.79 ± 0.02 |
| Morus alba Linn. | Moraceae | 10.2 | 1.48 ± 0.04 | 0.1 ± 0.01 | – | 0.62 ± 0.02 |
| Acer tetramerum var. betulifolium (Maxim.) Rehd | Aceraceae | 7.14 | 1.22 ± 0.04 | – | – | 0.36 ± 0.01 |
| Carya cathayensis Sarg | Juglandaceae | 6.12 | 0.77 ± 0.03 | 0.27 ± 0.02 | 1.53 ± 0.08 | 0.84 ± 0.03 |
| Kalopanax septemlobus (Thunb.) Koidz | Araliaceae | 5.1 | 0.55 ± 0.03 | 0.71 ± 0.03 | – | 0.41 ± 0.02 |
| Tilia oliveri Szyszyl | Tiliaceae | 4.08 | – | 0.44 ± 0.02 | 0.48 ± 0.02 | 0.4 ± 0.01 |
| Meliosma cuneifolia var. glabriuscula Cufod | Sabiaceae | 4.08 | 0.48 ± 0.02 | – | – | 0.16 ± 0.01 |
| Acer elegantulum Fang et P. L. Chiu | Aceraceae | 4.08 | 0.3 ± 0.02 | 0.29 ± 0.02 | 0.26 ± 0.02 | 0.27 ± 0.01 |
| Padus racemosa (Linn.) Gilib | Rosaceae | 3.06 | 0.43 ± 0.02 | 0.1 ± 0.01 | – | 0.14 ± 0.01 |
| Amygdalus persica L. | Rosaceae | 3.06 | 0.28 ± 0.02 | 0.34 ± 0.02 | 0.32 ± 0.02 | 0.34 ± 0.02 |
| Ulmus macrocarpa Hance | Ulmaceae | 3.06 | – | 0.29 ± 0.02 | 0.43 ± 0.03 | 0.31 ± 0.02 |
| Tilia oliveri | Tiliaceae | 2.04 | 0.31 ± 0.02 | – | – | 0.09 ± 0 |
| Betula platyphylla Suk | Betulaceae | 2.04 | – | 0.13 ± 0.01 | 0.41 ± 0.03 | 0.2 ± 0.01 |
| Corylus heterophylla var. sutchuenensis Franch | Betulaceae | 2.04 | 0.18 ± 0.01 | – | – | 0.08 ± 0.01 |
| Pyrus betulifolia Bge. | Rosaceae | 2.04 | 0.22 ± 0.02 | – | 0.37 ± 0.03 | 0.22 ± 0.01 |
| Acer henryi Pax | Aceraceae | 2.04 | – | 0.42 ± 0.02 | – | 0.17 ± 0.01 |
| Pyrus xerophila Yü | Rosaceae | 2.04 | 0.31 ± 0.02 | – | – | 0.09 ± 0 |
| Corylus heterophylla Fisch | Betulaceae | 2.04 | 0.48 ± 0.02 | – | – | 0.13 ± 0.01 |
| Spiraea alpina Pall | Rosaceae | 2.04 | 0.14 ± 0.01 | 0.19 ± 0.01 | – | 0.12 ± 0.01 |
| Rhus potaninii Maxim. | Anacardiaceae | 2.04 | – | 0.22 ± 0.02 | 0.32 ± 0.02 | 0.18 ± 0.01 |
| Pinus tabulaeformis Carr. | Pinaceae | 2.04 | – | – | 0.72 ± 0.04 | 0.33 ± 0.02 |
| Staphylea holocarpa Hemsl. | Staphyleaceae | 1.02 | 0.29 ± 0.02 | – | – | 0.06 ± 0 |
| Quercus spinosa David ex Franchet | Fagaceae | 1.02 | 0.21 ± 0.02 | – | – | 0.09 ± 0.01 |
| Celtis koraiensis Nakai | Ulmaceae | 1.02 | 0.16 ± 0.01 | – | – | 0.05 ± 0 |
| Sorbus hupehensis Schneid. | Rosaceae | 1.02 | 0.11 ± 0.01 | – | – | 0.04 ± 0 |
| Morus australis Poir. | Moraceae | 1.02 | 0.16 ± 0.01 | – | – | 0.04 ± 0 |
| Acer palmatum Thunb. | Aceraceae | 1.02 | 0.17 ± 0.01 | – | – | 0.04 ± 0 |
| Prunus salicina Linn. | Rosaceae | 1.02 | 0.18 ± 0.01 | – | – | 0.05 ± 0 |
| Carpinus cordata Bl. | Betulaceae | 1.02 | 0.15 ± 0.01 | – | – | 0.03 ± 0 |
| Fraxinus paxiana Lingelsh. | Oleaceae | 1.02 | 0.18 ± 0.01 | – | – | 0.06 ± 0 |
| Acer tsinglingense Fang et Hsieh. | Aceraceae | 1.02 | – | 0.12 ± 0.01 | – | 0.07 ± 0 |
| Sorbus alnifolia (Sieb. et Zucc.) K. Koch | Rosaceae | 1.02 | 0.2 ± 0.01 | – | – | 0.04 ± 0 |
| Amelanchier sinica (Schneid.) Chun | Rosaceae | 1.02 | 0.15 ± 0.01 | – | – | 0.04 ± 0 |
| Fraxinus platypoda Oliver | Oleaceae | 1.02 | – | 0.22 ± 0.02 | – | 0.06 ± 0 |
Juvenile tree means 5 cm ≤ DBH < 10 cm, Medium tree means 10 cm ≤ DBH < 25 cm, Large tree means DBH ≥ 25 cm, and All refers to all tree populations with DBH ≥ 5 cm in the studied plot