Spatial and Temporal Variation of Total Nitrogen and Total Phosphorus in Major River Systems of Sundarbans Mangrove Forest, Bangladesh

Abstract

Mangrove provides a unique ecological environment for diverse communities and Sundarbans is a rapidly changing ecosystem due to various anthropogenic activities. In order to assess the spatial and temporal variation of total Nitrogen and total Phosphorus concentration in Major River Systems of Sundarbans, a study was carried out from September, 2010 to February, 2011. Fourteen sampling location from major river systems were chosen. During post monsoon and winter seasons the range of total Phosphorus (0.326-0.409 mg/L and 0.091-0.371 mg/L respectively) and total nitrogen (2.52-3.50 mg/L and 3.43-5.25 mg/L respectively) were observed in Rupsha - Passur river system. On the other hand the range of total Phosphorus (0.475-0.144 mg/L and 0.060-0.113 mg/L respectively) and total nitrogen (2.31-3.61 mg/L and 3.22- 5.95 mg/L respectively) were found in Arpangashia - Malancha river system during post monsoon and winter seasons. The nutrients of water of Baleswar- Bhola river system during rainy and dry seasons were found in the range of total Phosphorus (0.106-0.364 mg/L and 0.053-0.075 mg/L respectively) and total nitrogen (2.59-3.57 mg/L and 2.87-5.60 mg/L respectively). Total Nitrogen and total phosphorus levels were relatively higher than the EPA standards for surface water during the two seasons. The Dynamic nutrients level observed in the study area may have severe consequences on the in-dwelling aquatic flora and fauna.