Table 5.1 Goshen Swamp water quality parameters one year before and one year after clearcut in June 1998; n=12 in both periods.
Before |
After |
|||||
parameter |
mean |
st dev |
range |
mean |
st dev |
range |
temperature (oC) |
16.7 |
5.3 |
10.1 - 26.3 |
17.3 |
7.7 |
2.8 - 26.8 |
pH |
6.5 |
0.3 |
5.7 - 7.1 |
6.2* |
0.4 |
5.8 - 6.9 |
specific conductivity ( mS/cm) |
153 |
57 |
70 -240 |
199* |
62 |
100 - 280 |
total suspended solids (mg/L) |
3 |
1.9 |
1 - 7 |
9.2 |
12.8 |
|
turbidity (NTU) |
9.5 |
11.2 |
1.8 - 41.1 |
16.2 |
30.4 |
1.4 - 111.4 |
dissolved oxygen (mg/L) |
6.3 |
2.9 |
1.7 - 10.5 |
5.1 |
4 |
0.0 - 12.6 |
fecal coliforms (colonies/100 mL) |
118 |
100 |
9 - 330 |
2148 |
6698 |
11 - 23400 |
chlorophyll a (mg/L) |
4.6 |
8.1 |
0.5 - 29.6 |
22.5 |
49.5 |
0.5 - 166.3 |
total phosphorus ( mg P/L) |
113 |
74 |
10 - 300 |
238 |
209 |
40 - 700 |
phosphate ( mg P/L) |
32 |
15 |
5 - 61 |
66 |
81 |
16 - 293 |
total nitrogen ( mg N/L) |
1425 |
366 |
920 - 1900 |
1525 |
1004 |
560 - 3460 |
total kjeldahl nitrogen ( mg N/L) |
1116 |
456 |
680 - 1800 |
1464 |
1047 |
440 - 3460 |
nitrate (mg N/L) |
309 |
387 |
20 - 1220 |
64* |
151 |
5 - 530 |
ammonia ( mg N/L) |
61 |
53 |
5 - 190 |
208* |
283 |
20 - 960 |
* indicates significant difference (p<0.05) between before and after means