Poland - IOW
Poland - IOW
Poland - IOW
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Results 38<br />
Table 3.8: Seepage rates of the 6 benthic chambers (BC) from October 2010.<br />
L m - ² d -1<br />
BC 1 79<br />
BC 2 76<br />
BC 3 28<br />
BC 4 25<br />
BC 5 113<br />
BC 6 13<br />
Figure 3.12: Changes in ammonium δ 15 N values in the benthic chambers (BC) during the<br />
incubation. BC 1 (●), BC 2 (■), BC 3 (▲), BC 4 (○), BC 5 (□) and BC 6 (Δ). For respective<br />
seepage rates see table 3.8. Start of incubation t 0 : 6 th of October at 15.45. End of incubation t 2 :<br />
7 th of October at 16.30.<br />
δ 15 N-NH + 4 values during the benthic chamber incubations were measured as well (Figure<br />
3.12). δ 15 N-NH + 4 values in the chambers 1 to 3 were between 0.8 ‰ and 1.5 ‰. Those three<br />
chambers also showed the highest ammonium flux rates (table 3.8, figure 3.11B). δ 15 +<br />
N-NH 4<br />
values were further decreasing during the dark incubation t 0 to t 1 (from 15.45 till 08.05) to<br />
about 0.2 ‰. During the subsequent light incubation t 1 to t 2 (from 08.05 till 16.30) δ 15 +<br />
N-NH 4<br />
values were slightly increasing again in chamber 1 and 3. In chamber 2 the δ 15 N-NH + 4 values<br />
remained the same. This chamber had by far the highest ammonium flux rate (Figure 3.11B).<br />
In chamber 4 to 6 δ 15 N-NH + 4 values were higher at the end of the dark incubation at 08.05 am<br />
than in the other three chambers and more variable. Values were highest in chamber 6 (2.3 ‰)<br />
and 4 (1.9 ‰). Those two chambers also showed the lowest seepage rates and lowest<br />
ammonium flux (Table 3.8, Figure 3.11B). δ 15 N-NH +<br />
4 values were increasing in both<br />
chambers during the light incubation from 08.05 to 16.30. Benthic chamber 5 had the highest<br />
seepage rates but low ammonium flux. The δ 15 N-NH + 4 value at the end of the dark incubation<br />
was 1.3 ‰ and decreased during the light incubation down to 0.9 ‰.