L1 /
9
CH3041
THE PHOSPHORUS
CYCLE
10 000
120 000
200 000
Soil +Biosphere
Soil +Biosphere
22
12
x 109 kg P
x 109 kg
P/a
Soluble
Natural 2
Human 2
Insoluble
20
200 000 000 y
Ocean 100 cycles
Surface 4 y
Deep 1 600 y
(P %crust = 0.11%)
1 x 109
