Table 2. Importance percentage of the twelve plant communities in Mt. Cheongryang, Incheon
(Unit: 400m²)

Species name	Community	Natural forest						Artificial forest
		Pinus densiflora	Quercus mongolica			Quercus variabilis	Prunus sargentii	Pinus rigida			Robinia pseudoacacia
		7	1	2	3	10	12	4	5	6	8	9	11
Pinus rigida		-	5.1	4.3	-	4.9	-	45.8	34.2	33.0	-	-	-
Pinus densiflora		46.7	-	-	-	7.1	-	5.2	3.2	-	-	-	1.6
Castanea crenata		6.8	1.7	0.6	-	-	-	0.4	3.4	0.9	14.9	9.9	-
Quercus acutissima		-	3.8	1.2	-	11.1	3.1	2.4	0.2	4.2	5.0	16.9	4.7
Quercus variabilis		-	-	-	-	43.5	17.4	0.5	6.8	4.1	0.3	0.3	18.2
Quercus mongolica		5.4	18.1	44.7	31.9	1.1	-	8.2	1.9	20.4	14.8	12.2	2.5
Quercus serrata		3.0	10.1	4.4	9.9	15.6	4.4	2.0	3.7	9.5	10.2	14.9	11.5
Sorbus alnifolia		-	22.5	2.2	23.8	0.3	5.3	0.9	-	3.8	0.8	6.8	-
Prunus sargentii		8.1	0.7	2.8	6.7	2.2	51.1	14.1	21.5	9.9	2.4	0.9	10.9
Robinia pseudoacacia		-	5.7	5.8	3.3	-	0.3	7.2	15.5	1.3	39.3	28.2	37.1
Rhododendron mucronulatum		1.2	8.5	14.1	5.7	2.8	0.7	1.9	0.3	7.2	2.0	1.0	4.1
Styrax japonicus		19.5	6.8	3.7	10.7	3.5	15.7	5.2	1.7	0.7	0.3	0.4	3.9
Others		9.5	17.1	16.3	8.0	7.9	2.2	6.3	7.7	4.9	10.1	8.5	5.5