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Table 3 Mean ammonia, nitrate, phosphate and sulphate content at the study points during field measurement

From: Nutrient dynamics in the Sundarbans mangrove estuarine system of Bangladesh under different weather and tidal cycles

Stations Seasons Concentrations of nutrients (mg/L)
NH3–N NO3–N PO4–P SO4
Pashurtala Post-monsoon 0.042±0.038 0.093±0.067 0.127±0.039 79.09±2.18
Dry winter 0.02±0.012 0.260±0.462 0.066±0.022 89.031±32.14
Monsoon 0.306±0.104 0.145±0.051 0.143±0.035 83.86±10.55
Pashurtala Canal Post-monsoon 0.053±0.055 0.136±0.053 0.103±0.018 83.58±3.99
Dry winter 0.039±0.004 0.195±0.305 0.076±0.054 101.49±16.20
Monsoon 0.330±0.049 0.149±0.030 0.115±0.052 116.09±22.58
Kalagachhi Post-monsoon 0.018±0.006 0.089±0.074 0.135±0.059 74.04±5.33
Dry winter 0.037±0.006 0.054±0.014 0.081±0.035 82.78±20.35
Monsoon 0.375±0.030 0.288±0.471 0.111±0.041 117.50±11.19
Kalagachhi Canal Post-monsoon 0.058±0.028 0.279±0.391 0.101±0.011 74.53±1.69
Dry winter 0.040±0.002 0.118±0.068 0.176±0.240 113.63±2.85
Monsoon 0.349±0.068 0.102±0.043 0.129±0.025 120.20±18.76
Nildumur Post-monsoon 0.017±0.007 0.18±0.188 0.118±0.029 71.51±6.92
Dry winter 0.036±0.004 0.106±0.095 0.257±0.441 98.53±17.36
Monsoon 0.313±0.076 0.106±0.044 0.140±0.028 122.14±7.16
Arpangashia Post-monsoon 0.044±0.045 0.149±0.060 0.100±0.017 61.16±3.82
Dry winter 0.037±0.003 0.093±0.068 0.110±0.053 110.32±11.44
Monsoon 0.364±0.049 0.214±0.121 0.135±0.022 122.92±5.76
  1. Mean values are calculated using data obtained from surface, middle and bottom layers of the water body at each station under both high and low tide conditions.