Table 6. Changes associative words by period.

Classification	1	2	3	4	5	6	7	8	9	10
The 1st period (2001∼2005)	Word A	species	Baekdu daegan	diversity	species	species	species	fishfauna	nature	section	ridge
	Word B	diversity	hiking	species	correlation	diversity	correlation	Baekdu daegan	ecosystem	structure	structure
	Strength	17	11	9	6	4	4	4	3	3	3
The 2nd period (2006∼2010)	Word A	Baekdu daegan	ecology	sangyungpyo	cutting	Pinus	ecology	Nochi village	maruguem	Baekdu daegan	establishing
	Word B	maruguem	restoration	Baekdu daegan	slope	Pinus densiflora	environment	old tree	Nochi village	damage	field survey
	Strength	7	4	2	2	2	2	2	2	2	2
The 3rd period (2011∼2015)	Word A	species	conservation	Gangwondo	structure	flora	Baekdu daegan	Quercus	Baekdu daegan	plant	management
	Word B	diversity	management	Baekdu daegan	management	conservation	protected area	Quercus mongolica	maruguem	community structure	Baekdu daegan
	Strength	17	13	11	7	7	7	6	6	6	5
The 4th period (2016∼2020)	Word A	Baekdu daegan	vascular	environment	rare	native	Baekdu daegan	naturalized	vegetation	sangyungpyo	vegetation
	Word B	hiking	flora	assessment	vegetation	vegetation	protected area	vegetation	native	Baekdu daegan	rare
	Strength	11	6	6	6	6	6	5	4	4	4
Total	Word A	species	Baekdu daegan	Baekdu daegan	conservation	Baekdu daegan	Gangwondo	native	rare	vascular	sangyungpyo
	Word B	diversity	hiking	maruguem	management	protected area	Baekdu daegan	vegetation	vegetation	flora	Baekdu daegan
	Strength	38	23	18	13	13	12	12	11	11	10