|
|
Water
Project |
Results:
Ekebyholmsskolan
| The first
water measurements on 8-9 Sept. 1997 |
| |
SU1 |
SU2 |
I |
O |
A |
SD |
S |
| pH* |
7,2 |
7,1 |
7,3 |
7,8 |
8,1 |
7,2 |
7,5 |
| pH |
7,2 |
7,2 |
7,3 |
7,7 |
7,6 |
7,2 |
7,5 |
| Conductivity (mS/m) |
26,9 |
26,2 |
27,9 |
30,3 |
31,2 |
30,6 |
40,9 |
| Oxygen (mg/l) -surface |
|
|
2,1 |
6,6 |
8,3 |
|
|
| Oxygen (mg/l) -bottom |
|
|
0,5 |
0,2 |
0,6 |
|
|
| Phosphate (µg/l)* |
22 |
21 |
55 |
3 |
3 |
4 |
21 |
| |
16 |
16 |
50 |
8 |
3 |
3 |
8 |
| Ammonium (µg/l)* |
120 |
88 |
280 |
23 |
20 |
120 |
50 |
| Nitrite (µg/l)* |
25 |
13 |
5 |
2 |
2 |
5 |
12 |
| |
27 |
13 |
3,5 |
1,5 |
1,5 |
4 |
10 |
| Nitrate (µg/l)* |
370 |
250 |
150 |
160 |
150 |
210 |
1900 |
| Chlorophyll (mg/m) |
4,1 |
1,3 |
4 |
2,6 |
5,4 |
0,7 |
0,3 |
| Turbidity (420nm)* |
317 |
433 |
185 |
443 |
|
|
|
| The second
water measurements on 5 Nov. - 6 Dec. 1997 |
| |
SU1 |
SU2 |
I |
O |
A |
SD |
S |
| pH |
7,5 |
7,6 |
7,5 |
8,0 |
7,9 |
7,6 |
7,6 |
| Conductivity (mS/m) |
36 |
31 |
31 |
29 |
32 |
31 |
40 |
| Oxygen (mg/l) -surface |
6,6 |
4,4 |
6,5 |
9,6 |
11,0 |
7,0 |
7,6 |
| Oxygen (mg/l) -bottom |
|
|
5,1 |
4,7 |
3,6 |
|
|
| Phosphate
PO43-(µg/l) |
15 |
18 |
17 |
1,4 |
8 |
3,0 |
18 |
| Ammonium
NH4+(µg/l) |
394 |
273 |
258 |
91 |
91 |
91 |
318 |
| Nitrite
NO2-(µg/l) |
30,0 |
6,0 |
9,0 |
1,0 |
2,0 |
1,0 |
16,5 |
| Nitrate
NO3-(µg/l)* |
4670 |
714 |
491 |
10 |
3 |
17 |
2084 |
| Chlorophyll (mg/m3) |
0,81 |
0,81 |
0,35 |
1,38 |
1,96 |
0,23 |
0,12 |
| Turbidity (A436nm) |
0,02 |
0,01 |
0,01 |
0,01 |
0,01 |
0,00 |
0,01 |
| Colour (mgPt/l) |
31,8 |
20,6 |
12,9 |
11,2 |
26,7 |
18,1 |
23,4 |
| The third
water measurements on 1 - 7 Feb. 1998 |
| |
SU1 |
SU2 |
I |
O |
A |
SD |
S |
| pH |
7,7 |
7,6 |
7,7 |
7,4 |
7,4 |
7,4 |
7,4 |
| Conductivity (mS/m) |
24 |
26 |
28 |
35 |
26 |
30 |
32 |
| Oxygen (mg/l) -surface |
8 |
|
8 |
7 |
9 |
|
|
| Oxygen (mg/l) -bottom |
|
|
3,4 |
3,9 |
1,2-3,4 |
|
|
| Phosphate
PO43-(µg/l) |
6,6 |
46 |
19,7 |
6,6 |
6,6 |
6,6 |
19,7 |
| Ammonium
NH4+(µg/l) |
6,6 |
12,6 |
6,6 |
7,2 |
6,6 |
5,4 |
12 |
| Nitrite
NO2-(µg/l) |
6,3 |
6,7 |
6,7 |
10,4 |
10,7 |
14,2 |
25,2 |
| Nitrate
NO3-(µg/l)* |
394 |
453 |
493 |
690 |
4390 |
606 |
975 |
| Chlorophyll (mg/m3) |
2,8 |
2,8 |
0,6 |
0,1 |
0,3 |
1,4 |
0,6 |
| Turbidity (A436nm) |
|
|
|
|
|
|
|
| Colour (mgPt/l) |
40 |
34 |
33 |
28 |
24 |
33 |
24 |
|
The fourth water
measurements on 29 Apr. - 7 May 1998 |
| |
SU1 |
SU2 |
SI |
SO |
SA |
SD |
S (R) |
Extra |
| pH |
7,8 |
7,7 |
7,6 |
8,2 |
7,7 |
7,9 |
7,8 |
7,8 |
| Conductivity (mS/m) |
20 |
22 |
21 |
22 |
28 |
24 |
24 |
22 |
| Oxygen (mg/l) -surface |
|
|
|
11,0 |
8,7 |
|
|
|
| Oxygen (mg/l) -bottom |
|
|
8,5 |
11,0 |
8,7 |
|
|
|
| Phosphate
PO43-(µg/l) |
75,0 |
34,4 |
25,0 |
12,5 |
37,5 |
37,5 |
37,5 |
21,9 |
| Ammonium
NH4+(µg/l) |
25,4 |
27,0 |
29,4 |
13,5 |
15,9 |
10,3 |
261 |
|
| Nitrite
NO2-(µg/l) |
6,0 |
6,4 |
7,0 |
6,0 |
9,0 |
6,0 |
11,0 |
|
| Nitrate
NO3-(µg/l)* |
464 |
523,6 |
473 |
324 |
341 |
294 |
209 |
370 |
| Chlorophyll (mg/m3) |
35 |
31 |
8 |
35 |
37 |
34 |
34 |
|
| Turbidity (A436nm) |
|
|
|
|
|
|
|
|
| Colour (mgPt/l) |
30,1 |
36,1 |
34,4 |
24,1 |
26,7 |
33,5 |
49,0 |
26,7 |
| Temperature (°C) S |
10,1 |
10,1 |
11,7 |
11,9 |
12,9 |
13,2 |
13,2 |
|
| Temperature (°C) B |
10,1 |
10,1 |
10,7 |
11,9 |
10,1 |
13,2 |
13,2 |
|
| Alk. (mmol/l) |
1,9 |
1,8 |
1,9 |
2,1 |
2,4 |
2,2 |
2,1 |
2,3 |
|
The fifth water
measurements on Sep. - Oct 1998 |
| |
SU1 |
SU2 |
I |
A |
SD |
| pH |
|
|
7,5 |
|
|
| Conductivity (mS/m) |
25 |
27 |
27 |
28 |
28 |
| Oxygen (mg/l) -bottom |
|
|
7,5 |
|
|
| Phosphate
PO43-(µg/l) |
|
45 |
18 |
|
|
| Total P- (µg/l) |
36,2 |
44 |
37,7 |
47,2 |
|
| Ammonium
NH4+(µg/l) |
|
160 |
140 |
76 |
|
| Nitrate
NO3-(µg/l)* |
490 |
|
|
100 |
350 |
| Total -P (µg/l) |
1400 |
1100 |
1300 |
1600 |
1100 |
| Chlorophyll (mg/m3) |
|
|
0,8 |
|
|
| Colour (mgPt/l) |
|
16 |
19 |
22 |
|
| Alcalinity (mmol/l) |
|
|
2,2, |
|
|
| Aluminium-Al (µg/l) |
All values under 50 |
| Iron - Fe (µg/l) |
330 |
340 |
135 |
190 |
230 |
 Lake Syningen, our study area in the water project, is
located in Uppland, eastern Sweden 60 km NE of Stockholm. It is small, 1.15
km² and its average depth is only 1.5 m. The lake is rich in vegetation.
Fields or a thin belt of deciduous forest surrounds the lake in all sides.
Map of Lake Syningen
|
|
Soil
project
Water project
Soil
Organism project
|