Table 6. Importance percentage of each of communities

Scientific name	Community Ia				Community IIb				Community IIIc
	Canopy	Understory	Shrub	Mean	Canopy	Understory	Shrub	Mean	Canopy	Understory	Shrub	Mean
Pinus densiflora	86.9	8.5	0.3	46.4	16.8	-	-	8.4	16.2	-	0.5	8.2
Quercus mongolica	7.8	17.5	7.6	11.0	64.7	13.1	5.6	37.6	21.2	5.0	3.7	12.9
Quercus serrata	1.6	24.5	10.2	10.7	5.6	8.3	-	5.6	47.1	15.5	6.1	29.7
Betula schmidtii	0.5	5.9	-	2.2	-	-	-	-	3.0	-	-	1.5
Pinus koraiensis	-	-	0.8	0.1	1.1	3.1	1.5	1.8	3.7	-	1.4	2.1
Lindera obtusiloba	-	5.7	26.6	6.3	-	17.6	20.9	9.3	-	1.5	29.5	5.4
Robinia pseudoacacia	-	2.1	0.7	0.8	1.8	15.7	3.5	6.7	-	-	-	-
Quercus acutissima	0.2	1.3	0.7	0.7	-	-	-	-	-	1.3	1.7	0.7
Prunus sargentii	0.5	10.5	0.4	3.8	-	19.9	-	6.6	1.3	12.1	-	4.7
Sorbus alnifolia	0.3	4.1	1.8	1.8	-	-	0.7	0.1	-	-	-	-
Rhododendron mucronulatum	-	-	25.7	4.3	-	1.1	28.8	5.2	-	-	18.7	3.1
Acer pseudosieboldianum	-	0.4	-	0.1	-	-	-	-	-	29.8	4.3	10.6
Styrax obassia	-	10.9	2.9	4.1	-	3.3	6.3	2.2	-	6.2	8.6	3.5
Castanea crenata	-	1.6	1.2	0.7	0.8	3.6	2.2	2.0	-	1.2	-	0.4
Quercus variabilis	0.5	1.0	0.4	0.6	-	1.3	-	0.4	-	11.0	3.0	4.2
Alnus hirsuta	-	0.9	0.3	0.4	7.1	-	-	3.6	-	7.0	1.0	2.5
Quercus aliena	0.4	0.0	0.7	0.3	1.0	-	-	0.5	6.4	-	-	3.2
Others	1.2	5.0	19.9	5.6	1.1	13	30.5	10.0	1.1	9.4	21.5	7.3
Total	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Scientific name	Community IVd				Community Ve				Community VIf
	Canopy	Understory	Shrub	Mean	Canopy	Understory	Shrub	Mean	Canopy	Understory	Shrub	Mean
Pinus densiflora	-	-	-	-	-	12.0	1.2	4.2	8.1	-	-	4.0
Quercus mongolica	3.5	-	-	1.8	3.1	18.0	30.3	12.6	-	4.6	11.8	3.5
Quercus serrata	1.8	15.4	4.5	6.8	-	-	5.1	0.9	-	4.7	16.0	4.2
Betula schmidtii	94.7	14.1	-	52.1	-	-	-	-	-	-	-	-
Pinus koraiensis	-	-	-	-	-	-	-	-	78.7	22.1	0.5	46.8
Lindera obtusiloba	-	6.9	58.6	12.1	-	-	14.5	2.4	-	-	10.1	1.7
Robinia pseudoacacia	-	-	-	-	35.9	27.8	3.0	27.7	4.7	7.5	4.0	5.5
Quercus acutissima	-	-	-	-	58.2	6.3	1.4	31.4	2.7	-	3.6	2.0
Prunus sargentii	-	6.9	-	2.3	-	12.7	-	4.2	-	16.5	-	5.5
Sorbus alnifolia	-	49.7	-	16.6	-	-	1.3	0.2	-	-	-	-
Rhododendron mucronulatum	-	-	14.3	2.4	-	-	2.8	0.5	-	-	0.6	0.1
Acer pseudosieboldianum	-	-	10.1	1.7	-	5.9	2.3	2.3	-	-	-	-
Castanea crenata	-	-	-	-	-	8.6	3.3	3.4	-	13.3	4.8	5.2
Quercus variabilis	-	6.9	-	2.3	-	-	1.4	0.2	4.5	-	-	2.2
Quercus dentata	-	-	-	-	2.8	6.3	4.0	4.2	-	-	-	-
Acer palmatum	-	-	-	-	-	2.6	10.2	2.6	-	2.1	2.4	1.1
Others	-	0.1	12.5	1.9	-	−0.2	19.2	3.2	1.3	29.2	46.2	18.2
Total	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

I: Pinus densiflora community
II: Quercus mongolica community
III: Quercus serrata-Quercus mongolica community
IV: Betula schmidtii community
V: Quercus acutissima-Robinia pseudoacacia community
VI: Pinus koraiensis community