Table 1. Classification and reactionary number of each factor by category.

Factors	Category
	1	2	3	4	5	Total
Slope gradient	<20º	21∼30º	31∼40º	41∼50º	51º<
React. no.	14	65	110	43	31	263
Aspect	N	E	S	W
React. no.	101	19	108	35		263
Vertical slope	Concave	Straight	Convex	Complex
React. no.	199	4	53	7		263
Cross slope	Concave	Straight	Convex	Complex
React. no.	224	8	25	6		263
Altitude	<400 m	401∼800 m	801∼1,200 m	1,201 m<
React. no.	19	90	109	45		263
position	Upper	Middle	Lower
React. no.	115	104	44			263
Stream order	0	1	2	3<
React. no.	48	100	81	34		263
Forest type	Coniferous	Deciduous	Mixed
React. no.	6	51	206			263
Parent rock	Igneous	Metamorphic
React. no.	145	118				263
Soil depth	<15 cm	16∼30 cm	31∼45 cm	46 cm<
React. no.	189	43	18	13		263