Table 1.

Basic information of the sample plots.

Sample plot number	Forest type	Main tree species	Stand age (years)	Age class	Elevation (m)	Slope (°)	Aspect	Mean tree height (m)	Mean DBH (cm)	Mean height to the first live branch (m)	Tree density (stems/ha)
1	Pure Cryptomeria fortunei	Cryptomeria fortunei	21	Middle-aged forest	1333	55°	North	17.71	21.72	9.01	625
2			21		1349	45°	Northwest	16.77	23.6	9.96	725
3			23		1323	54°	North	16.54	23.94	9.17	850
4	Pure Liquidambar formosana	Liquidambar formosana	22	Middle-aged forest	1317	53°	Northwest	18.14	26.81	12.94	650
5			21		1317	48°	Southwest	15.97	27.98	11.62	725
6			21		1317	60.5°	Northwest	16.62	28.25	9.02	750
7	Mixed forests	Cryptomeria fortunei and Liquidambar formosana	22	Middle-aged forest	1337	58.5°	Northwest	19.32	26.58	9.95	550
8			21		1339	53.1°	Northwest	15.59	30.97	9.69	475
9			22		1350	46°	Northwest	16.06	22.71	8.61	525