Table 2.6. Elements of phosphate exchange balance between water and bottom sediments in various bottom biotopes at reefs of the Heron
Z
c:
atoll obtained in the in situ experiments; for designations, see Table 2.5 (After Sorokin 1990c)
S.
C1>
Biotope
Depth
P04-P contents in
Condition of
Elements of
P04-P balance
a
til
(m)
water (11
mol 1-1)
illumination
in I1gm-2h-1
in mgm- 2
day-l
Ac
Ac
At
Ac
At
Coral sand covered by micro algae
0.5
0.22
Light
326.6
190.8
1358
7.68
-1.77
(diatoms) on the flat near Island
Dark
313.3
302.9
-10.4
Coral sand on flat opposite the Resort
0.7
0.22
Light
195.2
168.8
-26.4
3.58
+0.68
Dark
103.5
186.0
+82.5
Coarse sand in the Shark Bay near the
0.8
0.16
Light
165.8
145.4
-20.4
4.7
+0.92
shore of lsI.
Dark
117.9
192.3
+79.4
Coral sand covered by micro algae
1.2
0.21
Light
201.9
282.5
80.8
4.6
+3.81
among patch reefs
Dark
136.1
373.9
+237.8
Fine coral sand in central part of lagoon
6.0
0.17
Light
161.0
87.0
-74.7
3.79
-1.07
Dark
144.9
135.0
+9.3
Coral sand on outer leeward slope
8.0
0.19
Light
248.0
197.3
+50.7
4.70
+0.92
Dark
144.2
270.8
+126.7
0-