The Earth system and the cycling of carbon and nutrients - Fundamentals of the Physical Environment - page 520

Atmosphere
750

5.5

Global net primary
production and
respiration

Fossil fuels and
cement production

Changing
land use
1.6

61.4 60.0

92.0

90.0

0.5

Vegetation 610
Soil and detrius 1580
2190

Surface ocean
1020

Peatlands

40.0 50.0

Marine biota
3

100.0 11.6

Wood
Products

6.0

Intermediate and
deep ocean
38100

Dissolved Organic
Carbon <700

6.0

Surface sediment
150

0.2

Figure 21.5 The global carbon cycle. (Stocks and fluxes in petagrammes (Pg) of carbon).
Source: Canadian Forest Service

Photosynthesis

Growth

Decomposition

Figure 21.6 Fluxes studied in eddy covariance experiments
to determine Net Ecosystem Exchange (NEE).