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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

From: Interspecific associations of dominant tree populations in a virgin old-growth oak forest in the Qinling Mountains, China

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 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
  1. 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