Environmental Engineering Reference
In-Depth Information
60.00
% Sand
% Silt
% Clay
50.00
40.00
30.00
20.00
10.00
0.00
Figure 16. Seasonal variation of (%) of sand, silt and clay content of salt marsh bed of Fauzderhat area
of Chittagong coast.
Moisture content of soil of the study area was varied between seasons that were ranged
from 1.02%±0.21 to 2.16%±0.15 throughout the study period. Moisture level was minimum
(0.75%) during monsoon while the maximum (2.31%) level of soil moisture was recorded
during winter (Appendix A, Figure 17). Changes in soil moisture level between monsooon,
postmonsoon, winter and premonsoon were significant at p<0.05 (Table 1). Significantly
(p<0.05) higher value in winter and lower value in monsoon was recorded in this study. The
correlation matrix results showed that soil moisture positively correlated with water salinity,
water transparency, water table depth, soil salinity, soil organic carbon, organic matter,
percentage of clay, field water capacity and a negative correlation with water temperature,
dissolved oxygen, total suspended solids, tidal height, inundation period, soil temperature,
percentage of sand, bulk density, particle density, exchangeable Ca of soil. Moisture also
showed a negative correlation with exchangeable Mg of soil of the study area at a level of
P<0.05 (Appendix B).
Field water capacity of soil collected from the
P. coarctata
bed of Fauzderhat coast was
varied between seasons that were ranged from 45.75±0.77 to 52.38±1.15% throughout the
study period. Field water capacity was found to be a minimum (44.59%) level during
monsoon while the maximum value (54.50%) was recorded during winter (Appendix A,
Figure 18). Variations in the amount of field water capacity among monsoon, postmonsoon,
winter and premonsoon were significant at p<0.05 (Table 1). Significantly (p<0.05) higher
value in winter and lower value in monsoon was measured in this study. Field water capacity
showed a positive correlation with water salinity, water transparency, water table depth, soil
salinity, soil organic carbon, organic matter, percentage of clay and a negative correlation
with water temperature, dissolved oxygen, total suspended solids, tidal height, inundation
period, soil temperature, percentage of sand, bulk density, particle density, exchangeable Ca
& Mg, total N and available P of soil of salt marsh bed at a level of p<0.05 (Appendix B).
