Table 2. Carbon accumulated in China’s terrestrial ecosystems during 2000s.

Category		Method	Area(1.0e6 ha)	Carbon balance (PgC yr−1)	Period	Ref.
Vegetation	Forest stands	Inventory	149	0.174	1999–2008	16
		Inventory	156	0.115	2000–2007	18
		Inventory	149	0.104	1999–2008	17
	Forest ave.		151	0.13 ± 0.04
	Economic forests	Inventory	21	0.00	1999–2008	16
		Inventory	21	0.00	1999–2008	17
	Economic Forest ave.		21	0.00
	Bamboo	Inventory	5.1	0.013	1999–2008	16
		Inventory	5.1	0.005	1999–2008	17
	Bamboo ave.	Inventory	5.1	0.009 ± 0.006
	Woodlands	Inventory	5.4	−0.002 ± 0.001	1999–2008	16
	Shrub	Inventory	49.5	0.019 ± 0.013	1999–2008	16
	Tree on non-forest lands			−0.001 ± 0.001	1999–2008	16
	Grass	Inventory	331	0.007 ± 0.003	1980s,1990s	9
	Subtotal			0.17 ± 0.060
Soil	Forest	InTEC model	155	0.068 ± 0.034	1999–2008	This study
		Inventory	156	0.060 ± 0.030	2000–2007	18
	Forest ave.		155	0.064 ± 0.030
	Shrub	Statistic model	215	0.039 ± 0.009	1980s,1990s	9
		Process model	141	0.012 ± 0.005	1981–2000	20
	Shrub ave.			0.026 ± 0.019
	Crop	Aggregate	130	0.021 ± 0.004	1980s,1990s	21
	Grass	Aggregate	331	0.005 ± 0.002	1980s,1990s	21
	Subtotal			0.12 ± 0.060
	Total			0.29 ± 0.12