Table 1.
The fundamental information of sample tree

Samples	Age	DBH (cm)	Type	Examined annual ring	Density (g/cm³)
Ginkgo biloba	24	15	CW	5^th, 10^th , and 15^th to 20^th	0.50
			LW	5^th, 10^th , and 15^th to 20^th	0.47
			OW	5^th, 10^th , and 15^th to 20^th	0.51