Table 7. Relative density (RD), relative frequency (RF), relative coverage (RC), and importance percentage (IP) of tree seedlings and saplings growing in the P. densiflora forests.

Species	No. of trees (trees/ha)	Appearance rate (%)	Basal area (m2/ha)	RD (%)	RF (%)	RC (%)	IP (%)
Rhododendron mucronulatum	4,594	52.1	1.6	13.6	4.7	11.8	10.0
Quercus serrata	1,852	56.3	0.8	5.5	5.0	6.3	5.6
Lindera obtusiloba	1,909	57.2	0.7	5.6	5.1	5.2	5.3
Fraxinus sieboldiana	1,740	26.0	0.8	5.1	2.3	6.0	4.5
Toxicodendron trichocarpum	973	49.7	0.4	2.9	4.5	3.3	3.6
Smilax china	1,257	41.8	0.4	3.7	3.7	3.0	3.5
Rhododendron schlippenbachii	1,386	21.5	0.6	4.1	1.9	4.1	3.4
Quercus variabilis	946	48.0	0.4	2.8	4.3	2.9	3.3
Quercus mongolica	954	38.0	0.5	2.8	3.4	3.7	3.3
Zanthoxylum schinifolium	738	34.6	0.3	2.2	3.1	2.0	2.4
Prunus serrulata var. pubescens	535	39.9	0.2	1.6	3.6	1.8	2.3
Styrax japonicus	651	26.7	0.3	1.9	2.4	2.6	2.3
Sasa borealis	1,149	1.6	0.4	3.4	0.1	2.7	2.1
Lespedeza bicolor	600	25.2	0.2	1.8	2.3	1.5	1.8
Castanea crenata	408	27.9	0.2	1.2	2.5	1.6	1.8
Lespedeza maximowiczii	674	17.0	0.2	2.0	1.5	1.6	1.7
Lindera glauca	546	21.4	0.2	1.6	1.9	1.5	1.7
Smilax sieboldii	541	23.2	0.2	1.6	2.1	1.3	1.6
Pinus densiflora	366	18.9	0.3	1.1	1.7	2.2	1.6
Rhododendron yedoense f. poukhanense
and so on (257 spp.)	12,007	-	4.7	35.5	43.9	35.0	38.1
Total	33,823	-	13.4	100.0	100.0	100.0	100.0