Info

Labile inorganic P

Immob.

Min./Immob

Turnover

Labile organic P

Stable organic P

Surface, subsurface and streamflow

Humus formation and degradation

Geochemical subsystem

Leaching

FIGURE 15.3 Schematic representation of the phosphorus cycle consisting of a biological subcycle in the upper right and a geochemical subcycle in the lower left (with permission from Walbridge, 1991).

TABLE 15.1 Major Reservoirs of Phosphorus in the Earth"

Reservoir

Atmosphere (particulates) Land Soil

Mineable rock (high apatite) Biota

Fresh water (dissolved) Ocean Sediments Dissolved (organic) Detritus (particulates) Biota

Total phosphorus (X1015g)

Worm Farming

Worm Farming

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