Seasonal nutrient distribution in the Rupsha-Passur tidal river system of the Sundarbans mangrove forest, Bangladesh

Ecological Processes

Table 2 Mean of surface, middle and bottom water layer nutrients measured at the study points under high and low tide conditions

Sampling station	Study period	PO₄-P (mg/L)	SO₄(mg/L)	NO₃-N (mg/L)	NH₃-N (mg/L)
Karamjal	Post monsoon	0.533 ± 0.226	7.902 ± 0.733	0.646 ± 0.210	0.038 ± 0.007
	Dry winter	0.223 ± 0.047	30.144 ± 0.466	0.303 ± 0.014	0.075 ± 0.002
	Monsoon	0.314 ± 0.263	19.724 ± 6.445	0.713 ± 0.116	0.015 ± 0.001
Karamjal Canal	Post monsoon	0.492 ± 0.252	7.989 ± 0.242	0.848 ± 0.168	0.050 ± 0
	Dry winter	0.112 ± 0.007	21.819 ± 1.039	0.85 ± 0.542	0.075 ± 0.007
	Monsoon	0.137 ± 0.012	51.065 ± 53.33	0.856 ± 0.085	0.015 ± 0.003
Joymoni	Post monsoon	0.557 ± 0.292	7.674 ± 0.141	0.443 ± 0.306	0.047 ± 0
	Dry winter	0.262 ± 0.106	28.454 ± 1.069	0.883 ± 0.259	0.077 ± 0
	Monsoon	0.127 ± 0.098	13.697 ± 1.710	0.96 ± 0	0.014 ± 0.00
Harbaria	Post monsoon	0.410 ± 0.042	7.819 ± 0.733	0.772 ± 0.159	0.040 ± 0
	Dry winter	0.162 ± 0.077	32.451 ± 7.151	0.28 ± 0.264	0.077 ± 0
	Monsoon	0.166 ± 0.171	64.911 ± 81.103	0.895 ± 0.091	0.016 ± 0.002
Harbaria Canal	Post monsoon	0.892 ± 0.643	8.742 ± 1.854	0.556 ± 0.158	0.050 ± 0.004
	Dry winter	0.163 ± 0.127	24.434 ± 2.653	0.24 ± 0.221	0.073 ± 0.004
	Monsoon	0.289 ± 0.205	119.75 ± 10.139	0.7 ± 0	0.017 ± 0.002