France - The Mediterranean Lagoons
1,0 (a)
0,8
.S!
'Iii
~ 0,6
E 0
'Iii 0,4
~
0,2
0,0
80
l
(b)
Cii 60
:5
1 ::;)
.50 40
C
~ 0 0
Z
20
"V
C
III
(,)
0
l
80 (c)
c
E
:::lI
'0 60
0
. .
.!
;
.50 40
..
~
E
i
20
:::lI
.2
1:
:.
0
J F M A M J
121 C surface
D Nsurface
iii C bottom
.. N bottom
~ C surface
D N surface
iii Cbottom
.. N bottom
J
325
Fig. 13.12. Prevost lagoon. a
NIP ratio, and seasonal variation of carbon and nitrogen
content C%) in the thalli b or
in particulate matter c
The estimation of the macrophytic production shows that the nitrogen
passing through macrophytic production averages about 62 kg ha - 1
year-I, which is 20 times that of Thau lagoon (De Casabianca-Chassany
1992).