Table 8. Estimated annual C_org stocks in soils of different ecosystems.

Ecosystem	Soil/sediment Carbon Accumulation rate
	(g C m−2 y−1)
Tropical Forests	2.3–2.5
Temp Forests	1.4–12
Boreal Forests	0.8–2.2
Temp grassland	2.2
Temperate desert	0.8
Tundra	0.2–0.7
Posidonia oceanica	6–175
Australian seagrasses	1.0–66.5 *
	Soil/sediment Carbon Stock
	(g C m−2)
Tropical montane	6100
Tropical wet	6100
Tropical moist	5000
Tropical dry	2200
Warm Temperate moist	7600
Warm temperate dry	2600
Cool temperate moist	11600
Cool temperate dry	4900
Boreal	14900
Polar	11800
Australian seagrasses	1090 – 20140#
P. oceanica	10500–40000∧

Data from [67] except Australian seagrasses (this study) and P. oceanica (based on the range reported [5], [7], [42], [47].

^{* ∧}Value assume sediment depth of 1 m, which is a conservative estimate for the higher values which are for Posidonia ecosystems with reported organic sediment depths of >2.5 m ([23] and Pers. Obs. for Oyster Harbour and Waychinicup Inlet in SW Australia; P. oceanica references as above).