Study of the Dynamics of Phosphorus
271
the water column during such short experiments is negligible (Sorokin 1992).
The rate of uptake flow of P04-P from the water column into the bottom
V x (R - R.) x (P + P.)
sediments (Ac) is calculated by the expression: A =
0
I
0
I
C
K x t x S x(Ro + R)
~g P m- 2 h- 1 , where V is the volume of the enclosure, 1; Ro and Ri are the initial
and final radioactivity of P04-P, cpml- 1 ; Po and Pi are the initial and final P04P content in water, ~gPl-l; K is the correction coefficient for water exchange;
t is the exposure time, h, and S is the bottom area of the enclosure, m- 2 . The
release flow of phosphate from the bottom up to the water column (Ae) and
the balance rate of both Ac and Ae reciprocal its flows are then calculated as
described above.