Environmental Engineering Reference
In-Depth Information
addition the correlation between water temperature and total N was found to be positive that
was significant at the level of p<0.05 (Appendix B).
A clear seasonal pattern of water salinity was observed in the vicinity of salt marsh bed of
Fauzderhat coastal area. A sharp increasing trend from monsoon to winter and slightly
decreasing trend from winter to premonsoon was noticed throughout the study (Figure 4).
However, the average water salinity values recorded in different seasons were ranged from
4.17‰ﾱ4.75 to 19.01ﾱ0.87‰. Minimum value (0‰) for water salinity was recorded during
monsoon in the month of August while the maximum value (21.56‰) was found during
premonsoon in the month of March in this study (Appendix A). Significant variations
(p<0.05) in water salinity between monsoon to postmonsoon, monsoon to winter and
monsoon to premonsoon were observed during the study period (Table 1). Significantly
higher (p<0.05) value in winter and lower value in monsoon was recorded. The water salinity
was positively correlated (p<0.01) with water transparency, water table depth, soil salinity,
soil organic carbon, organic matter, % clay, soil moisture, field water capacity and negatively
correlated with dissolved oxygen, total suspended solids, inundation period, % sand, bulk
density, particle density and the exchangeable Mg of soil at 1% level of significance. Water
salinity also negatively correlated (p<0.05) with soil temperature, exchangeable Ca and
available P in the present study (Appendix B).
Table 1. Results of ANOVA (Tukey's HSD post hoc analysis) for multiple comparisons
of different hydropedological factors recorded in different seasons
Seas
o
ns
Factors
Monsoon
Postmonsoon
Winter
Premonsoon
29.99±±2.50
a
27.85±2.24
a,c
23.34±2.76
b,c
31.05±2.45
a
Water Temperature
Water Salinity
4.17±4.75
b
12.35±7.06
a,b
19.01±0.87
a
17.11±3.03
a
Water pH
6.90±0.08
a
6.96±0.06
a
6.98±0.14
a
6.97±0.09
a
9.11±1.34
b
13.88±2.97
b,c
19.22±1.41
a
16.03±3.91
ac
Water transparency
Dissolved oxygen
5.96±0.15
a
5.65±0.07
b,d
4.99±0.04
c
5.42±0.24
d
1096.25±51.94
a
526.25±44.79
b
159.17±29.81
c
762.50±57.25
d
Total suspended solids
2.66±0.13
a
2.01±0.19
b,e
1.10±0.15
c
2.02±0.25
d,e
Tidal Height
Inundation period
4.57±0.22
a
3.25±0.16
b
1.42±0.11
c
3.76±0.49
d
20.24±0.89
c
25.59±0.48
d,e
45.34±1.64
a
27.37±1.24
b,e
Water table depth
Soil temperature
30.10±2.25
a
26.14±2.83
a,c
22.18±1.37
b,c
31.09±4.12
a
6.86±0.06
a
6.85±0.16
a
6.76±0.06
a
6.97±0.47
a
Soil pH
10.52±4.52
b
13.59±0.96
b,c
21.06±2.69
a,c
17.83±3.33
a,c
Soil Water Salinity
Soil organic carbon
1.76±0.20
b
2.20±0.17
b
3.42±0.80
a
2.21±0.42
b
3.03±0.35
b
3.77±0.25
b
5.90±1.38
a
3.81±0.73
b
Soil organic matter
% Sand
17.47±0.96
a
11.47±1.63
b
6.73±0.40
c
14.07±3.14
b
50.36±1.31
a
50.65±0.34
a
51.24±0.64
a
50.05±0.69
a
% Silt
% Clay
32.17±1.88
c
37.88±1.45
b
42.04±0.68
a
35.88±2.62
b
Soil moisture
1.02±0.21
b
1.84±0.09
a
2.16±0.15
a
1.33±0.35
b
45.75±0.77
c
48.17±0.54
b
52.38±1.15
a
47.36±2.14
b,c
Field water capacity
