Table 5.
Table 5. Change of plant cluster structure in Plot 2 of Qureus mongolica forest of the northern slope of Namsan(Mt.)(2000~2016) (Area: 400m²)

Layer	Species	2000				2005				2007				2016
		C1	U	S	M	C	U	S	M	C	U	S	M	C	U	S	M
Relative ratio (%)	Quercus mongolica	100.00	-	20.30	53.38	100.00	8.22	9.60	54.34	100.00	8.16	3.90	53.37	100.00	-	7.31	51.22
	Acer pseudosieboldianum	-	24.04	41.14	14.87	-	24.59	43.37	15.43	-	24.05	47.18	15.88	-	35.13	8.42	13.11
	Sorbus alnifolia	-	35.48	6.03	12.83	-	34.29	6.10	12.45	-	30.41	24.24	14.18	-	34.38	-	11.46
	Styrax japonicus	-	38.73	7.46	14.15	-	29.71	4.29	10.62	-	34.25	15.91	14.07	-	24.75	3.36	8.81
	Stephanandra incisa var. incisa	-	-	10.36	1.73	-	-	8.05	1.34	-	-	2.03	0.34	-	-	21.33	3.56
	Carllicarpa japonica	-	-	-	-	-	-	-	-	-	-	-	-	-	-	17.39	2.90
	Lespedeza cyrtobotrya	-	-	-	-	-	-	-	-	-	-	-	-	-	-	8.73	1.46
	Morus alba	-	-	-	-	-	-	-	-	-	-	-	-	-	-	7.81	1.30
	Carpinus laxiflora	-	1.75	-	0.58	-	1.76	-	0.59	-	1.79	-	0.60	-	3.45	-	1.15
	Vitis coignetiae	-	-	-	-	-	-	-	-	-	-	-	-	-	-	5.21	0.87
	Zelkova serrata	-	-	-	-	-	-	-	-	-	-	-	-	-	-	4.74	0.79
	Magnolia obovata	-	-	-	-	-	1.43	-	0.48	-	1.35	-	0.45	-	2.30	-	0.77
	Zanthoxylum piperitum	-	-	-	-	-	-	-	-	-	-	-	-	-	-	3.36	0.56
	Aralia elata	-	-	-	-	-	-	-	-	-	-	-	-	-	-	3.36	0.56
	Cornus controversa	-	-	-	-	-	-	-	-	-	-	-	-	-	-	3.36	0.56
	Robinia pseudoacacia	-	-	-	-	-	-	-	-	-	-	-	-	-	-	2.44	0.41
	Rubus crataegifolius	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1.63	0.27
	A. brevipedunculata	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1.58	0.26
	Symplocos chinensis for. pilosa	-	-	2.97	0.50	-	-	-	-	-	-	2.17	0.36	-	-	-	-
	Celastrus orbiculatus	-	-	0.93	0.16	-	-	-	-	-	-	-	-	-	-	-	-
	Viburnum erosum	-	-	8.45	1.41	-	-	4.02	0.67	-	-	2.60	0.43	-	-	-	-
	Prunus sargentii	-	-	1.48	0.25	-	-	1.36	0.23	-	-	-	-	-	-	-	-
	Euonymus oxyphyllus	-	-	0.88	0.15	-	-	14.89	2.48	-	-	1.98	0.33	-	-	-	-
	Rhus trichocarpa	-	-	-	-	-	-	1.44	0.24	-	-	-	-	-	-	-	-
	Acer palmatum	-	-	-	-	-	-	6.88	1.15	-	-	-	-	-	-	-	-
The number of populatio		17	39	228	284	15	37	168	220	17	38	104	159	3	33	128	164
Amount of species(species)		11				12				10				18
Shannon’s species diversity index(H’)		0.8021				0.8603				0.7582				1.1166
Various species diversity indices(2016)		H’(Shannon)				J’(evenness)				D(dominance)				H’max
		1.1166				0.8895				0.1105				1.2553

C: Canopy layer of importance percentage, U: Understory layer of importance percentage, S: Shrub layer of importance percentage, M: Mean importance percentage.