Environmental Engineering Reference
In-Depth Information
7.20
7.10
7.00
6.90
6.80
6.70
6.60
6.50
Figure 5. Seasonal changes of water pH of salt marsh bed of the study area.
Hydrogen ion concentration (pH) in surface waters of the study area remained almost to
neutral in different seasons throughout the study period and it was ranged from 6.90±0.08
6.98±0.14 with minimum value (6.79) during the monsoon and maximum value (7.22) during
winter (Appendix A). Water pH values were gradually increased from monsoon to winter and
it decreased in premonsoon again (Figure 5). Seasonal variations in water pH among the
seasons were not significant at the level of p<0.05 (Table 1).
The average water transparency value recorded in and around the P. coarctata bed was
significantly varied among the seasons that were ranged from 9.11±1.34 to 19.22±1.41cm
throughout the study period. Water transparency level was minimum (6.67cm) during
monsoon while the maximum level of water transparency (20.67cm) was recorded during
winter (Appendix A). Water transparency level sharply increased from monsoon to winter
that was also declined in premonsoon (Figure 6). Significantly higher (p<0.05) value in
winter and lower value in monsoon was recorded in this study. Changes in water transparency
level among monsoon, postmonsoon, winter and premonsoon were significant at p<0.05
(Table 1). The correlation matrix results showed that there were a significant (p<0.01)
positive relationships within water transparency, water salinity, water table depth, soil
salinity, soil organic carbon, organic matter, soil texture (% clay), soil moisture, field water
capacity of soil and a significant negative (p<0.01) relationships within water transparency,
water temperature, dissolved oxygen, total suspended solids, tidal height, inundation period,
soil temperature, soil texture (% sand), bulk density, particle density, the exchangeable Ca,
Mg, total N and the available P of soil were observed in the present study (Appendix B).
Variations in dissolved oxygen content were ranged from 4.99±0.04 to 5.96±0.15mg/l in
the vicinity of P. coarctata bed of Fauzderhat coast. The higher values were reached in
monsoon (6.15 mg/L) and the lower values (4.91 mg/L) were observed during winter
(Appendix A). DO level slowly decreased from monsoon towards winter that was also
increased during premonsoon (Figure 7) throughout the study period. Variations in dissolved
oxygen concentrations recorded in different seasons during study period were significant
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