Table 3. Importance value(IV) and Mean importance value(MIV) of major 15 species.

Type	Species	Layers				MIV
		T	ST	S	H
TP	Abies nephrolepis	34.2	5.0	2.5	1.9	17.9
	Quercus mongolica	10.9	2.9	3.2	0.2	6.4
	Acer pseudosieboldianum	5.2	9.4	6.3	0.6	6.3
	Magnolia sieboldii	-	12.8	8.1	2.0	5.3
	Pinus koraiensis	9.0	1.7	1.5	1.5	5.0
	Acer pictum. var. mono	5.8	6.0	0.7	-	4.7
	Acer ukurunduense	1.9	9.4	4.0	0.7	4.4
	Taxus cuspidata	7.5	2.1	1.5	0.6	4.4
	Tripterygium regelii	-	9.4	7.6	1.6	4.2
	Sorbus commixta	1.5	8.9	4.2	0.3	4.1
	Tilia amurensis	4.4	5.1	1.5	-	3.8
	Betula ermanii	4.8	1.2	-	0.3	2.6
	Prunus padus	1.5	3.3	4.3	0.3	2.4
	Actinidia arguta	-	4.1	5.0	0.3	2.1
	Acer komarovii	-	2.7	4.7	1.5	1.7
	others (97 species)	13.3	15.8	45.0	88.3	24.7
	total	100.0	100.0	100.0	100.0	100.0
SP	Abies nephrolepis	36.6	9.8	5.4	2.9	21.0
	Betula ermanii	11.2	9.2	2.1	1.0	8.4
	Quercus mongolica	11.1	7.3	1.4	1.0	7.7
	Sorbus commixta	3.5	9.7	4.5	1.3	5.4
	Pinus koraiensis	8.0	2.3	2.5	0.8	4.9
	Acer komarovii	1.4	6.4	4.3	1.6	3.4
	Tilia amurensis	3.9	4.6	1.0	0.3	3.4
	Acer pseudosieboldianum	0.9	7.0	4.4	1.3	3.3
	Acer pictum. var. mono	3.2	4.7	0.9	0.3	3.1
	Taxus cuspidata	3.3	3.4	0.7	0.1	2.7
	Magnolia sieboldii	-	5.3	4.3	0.8	2.3
	Acer ukurunduense	1.1	5.0	1.6	0.2	2.3
	Fraxinus rhynchophylla	2.8	2.6	1.0	0.2	2.3
	Tripterygium regelii	-	-	12.3	3.3	2.1
	Prunus padus	1.6	2.3	2.9	0.4	1.9
	others (259 species)	11.3	20.4	50.6	84.3	25.8
	total	100.0	100.0	100.0	100.0	100.0
A	Abies nephrolepis	36.5	10.8	7.2	3.3	21.6
	Quercus mongolica	12.6	6.7	0.7	0.9	8.1
	Sorbus commixta	4.2	13.0	4.8	1.4	6.8
	Tilia amurensis	6.2	7.4	1.6	0.3	5.4
	Pinus koraiensis	7.3	2.7	2.3	1.3	4.6
	Betula ermanii	6.5	4.2	0.8	0.2	4.4
	Acer pseudosieboldianum	1.3	7.7	4.6	1.4	3.8
	Magnolia sieboldii	-	7.1	7.5	1.4	3.5
	Acer pictum. var. mono	3.2	4.0	1.5	0.1	2.9
	Acer ukurunduense	0.9	4.6	2.1	0.3	2.2
	Acer komarovii	0.5	4.0	3.0	1.8	2.1
	Prunus padus	0.8	3.7	3.0	0.9	2.0
	Rhododendron schlippenbachii	-	0.6	9.2	1.8	1.8
	Carpinus cordata	1.3	2.4	1.1	0.1	1.5
	Fraxinus rhynchophylla	1.8	1.8	0.7	0.2	1.5
	others (229 species)	16.9	19.2	49.9	84.7	27.9
	total	100.0	100.0	100.0	100.0	100.0