Table 3.

Revised biome C inventories if the root C pool (C_R) of each biome is increased according to assumption (ii) and table 2, from those in table 1.

biome	plant C (Pg)
	above	below	total	soil Ca (Pg)	biome C (Pg)	C sinkb (Pg yr−1)	C sink increasec (%)
	CA	CR	CV	CS	CB	S
tropical forest	266	123	389	214	602	0.72	9
temperate forest	109	49	159	153	312	0.37	7
Boreal forest	42	25	67	338	405	0.49	3
Mediterranean shrubland	8	14	22	71	94	0.11	6
tropical savanna and grassland	55	39	94	247	342	0.41	5
temperate grassland	2	6	8	176	185	0.22	1
deserts	5	8	13	159	172	0.21	2
tundra	1	2	3	115	118	0.14	1
crops	4	1	4	11	15	0.02	2
total	492	268	759	1485	2244	2.69	5

^aSoil C is calculated for a depth of 1 m (Saugier et al. 2001), see table 1.

^bC sinks estimated as described in §2 and table 1.

^cIncreases in the C sink are expressed as percentages of those in table 1.