Abstract
Impact of Jute Retting on Physicochemical Profile of Chhariganga Oxbow Lake in Nadia District, West Bengal, India
Highlights
Oxbow lakes being natural depressions and kidneys of the landscape have great ecological and socio-economical importance (Ghosh and Biswas, 2015a, d)
The highest mean values of biochemical oxygen demand (BOD) (4.59ppm), Chemical oxygen demand (COD) (86.67ppm), OP (0.50ppm), sediment organic carbon (2.29%) were observed during monsoon whereas the lowest values of oxbow lake water’s transparency (27.00cm), pH (7.84), Dissolved oxygen (DO) (3.63ppm) and NO2–N(0.01 ppm) contents were found during monsoon when jute retting process intensified in the oxbow lake. Compared to their values in pre-monsoon, mean values in monsoon showed an increase in BOD (182.57%) and OP content (167.64%) unlike reduction in water transparency (62.54%), Gross primary productivity (GPP) and Net primary productivity (NPP); The highest concentration of NH4-N and NO3-N were noticed during post-monsoon and OP during monsoon
Compared to their values in pre-monsoon, mean values in monsoon showed an increase in BOD (182.57%), COD (18.18%), NH4-N (7.87%), NO3-N (17.73%) and OP content (167.64%) while reduction in water transparency (62.54%), pH (5.74%), DO (22.16%), NO2-N (65.68%), total hardness (21.63%), total alkalinity (24.27%), GPP and NPP; sediment organic carbon content (10.11%) and pH values (7.36%)
Summary
Oxbow lakes being natural depressions and kidneys of the landscape have great ecological and socio-economical importance (Ghosh and Biswas, 2015a, d). They are subject to various human activities, pollution, eutrophication, use of agricultural pesticides in catchment areas, jute retting. Excavation and large scale pit extraction disfigure oxbow lakes landscapes and limits their values for other (Ghosh and Biswas, 2015d). The effects of siltation, habitat destruction, and macrophyte infestation, isola-. Dipankar Ghosh and Jayanta Kumar Biswas /Arch.
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