Table 1.

Forest area, total biomass stock, and biomass density in different periods for four major planted forest types in Japan

		Year						Change over 1980–2005
Forest type	Item	1980	1985	1990	1995	2000	2005
C. japonica	Area, 106 ha	4.27	4.44	4.51	4.49	4.43	4.37	0.1
	Total biomass, Tg C	179.1	228.3	265.7	300.5	355.5	391.5	212.4
	Biomass density, Mg C⋅ha−1	42	51.4	59	67	80.3	89.5	47.5
C. obtusa	Area, 106 ha	2.04	2.29	2.42	2.49	2.51	2.51	0.47
	Total biomass, Tg C	81.7	106.1	125.9	147.1	174.3	193.8	112.1
	Biomass density, Mg C⋅ha−1	40.1	46.4	52	59	69.5	77.2	37.1
P. densiflora	Area, 106 ha	1.18	1.08	1.02	0.97	0.89	0.86	−0.08
	Total biomass, Tg C	34.4	40	44.8	48.9	55.1	58.3	23.9
	Biomass density, Mg C⋅ha−1	29.2	37.2	44	50.4	62	67.6	38.3
L. leptolepis	Area, 106 ha	1.1	1.09	1.08	1.07	1.04	1.01	−0.09
	Total biomass, Tg C	37.7	47.7	54	60.2	67.5	70.6	32.9
	Biomass density, Mg C⋅ha−1	34.2	43.9	50	56.4	64.9	69.9	35.7