Table 6. Forest growing stock volumes and results of the t-test for two versions (mean ± standard error).

Forest stand	Category	Ver.1(m³/ha)	Ver.2(m³/ha)	t value	p value
Cryptomeria japonica	6^th NFI	271.29 ± 16.18	325.70 ± 19.82	11.45	<0.001
Cryptomeria japonica	7^th NFI	313.31 ± 17.52	376.85 ± 21.49	12.94	<0.001
Chamaecyparis obtusa	6^th NFI	176.62 ± 16.02	208.12 ± 18.44	11.00	<0.001
Chamaecyparis obtusa	7^th NFI	239.75 ± 17.60	279.58 ± 20.00	12.50	<0.001