Seasonal Changes and Spatial Variation in Water Quality of a Large Young Tropical Reservoir and Its Downstream River
Table 2
Mean difference of water quality parameters of the Bakun Reservoir during the wet season and dry season conducted in February and September 2014, respectively ().
Parameter
Sampling
Depth
Station
Mean
Difference
value
1
2
3
4
5
pH
Wet season
0 m
6.67
+0.20
0.422
10 m
20 m
Dry season
0 m
6.47
10 m
20 m
Turbidity, FNU
Wet season
0 m
38.89
−42.35
0.020
10 m
20 m
Dry season
0 m
81.24
10 m
20 m
Chl a, µg/L
Wet season
0 m
0.93
−0.18
0.655
10 m
20 m
Dry season
0 m
1.11
10 m
20 m
TSS, mg/L
Wet season
0 m
40.1
−29.6
0.147
10 m
20 m
Dry season
0 m
69.7
10 m
20 m
BOD5, mg/L
Wet season
0 m
4.02
−0.26
0.135
10 m
20 m
Dry season
0 m
4.28
10 m
20 m
-N, mg/L
Wet season
0 m
0.004
+0.001
0.282
10 m
20 m
Dry season
0 m
0.003
10 m
20 m
-N, mg/L
Wet season
0 m
0.021
+0.006
0.233
10 m
20 m
Dry season
0 m
0.015
10 m
20 m
OKN, mg/L
Wet season
0 m
0.34
+0.01
0.783
10 m
20 m
Dry season
0 m
0.33
10 m
20 m
SRP, µg/L
Wet season
0 m
8.6
−29.4
0.000
10 m
20 m
Dry season
0 m
37.9
10 m
20 m
TP, µg/L
Wet season
0 m
112.4
−122.6
0.000
10 m
20 m
Dry season
0 m
235.1
10 m
20 m
Means in the same row with the same letters or column with the same numbers are not significantly different at 5% level. The positive value of mean difference indicates that the parameter studied is higher during the wet season whereas the negative value indicates that the parameter studied is higher during the dry season. The significant difference at p value ≤ 0.05 is indicated in bold.
