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

Ecological Processes

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

Stations	Seasons	Concentrations of nutrients (mg/L)
Stations	Seasons	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

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.