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In the Raiganj Wildlife Sanctuary, premonsoon (March-June) was characterized by high air temperature, low percentage of relative humidity and occasional rain. The monsoon season (July –September) had high percentage of relative humidity and higher rainfall. On the other hand the postmonsoon season (October-February) was characterized by lower temperature and lesser precipitation. The pH of water of the sanctuary remained slightly acidic during monsoon season. Conductivity value was maximum during summer and minimum during winter months. BOD values have been recorded higher during premonsoon season. The minimum value of CO2 was observed during winter months. The increase in total alkalinity during summer months appeared to be due to the concentration of nutrients in water. Total suspended solid and total dissolved solid values were maximum in summer and minimum in winter. Premonsoon showed high chloride values when water level was low followed by monsoon and postmonsoon with high water levels. Nitrate value was higher during monsoon season and decreased in postmonsoon and premonsoon season. High amount of phosphate remained in the canals during summer months. The pH values of soil were recorded 6.0 and below 6.0. The nature of soil of the sanctuary seemed to be acidic. Percentage of organic carbon increased after premonsoon season in both the core and buffer region and this value became highest during postmonsoon season. High concentration of available nitrogen and available potash was observed in the core region as well as buffer region during postmonsoon than premonsoon season. Availlable phosphate content value was lower than the nitrogen and potash content of soil of the sanctuary. The physico-chemical characteristics of water expressed the poor water quality in the canals of the sanctuary. This characteristic showed maximum contamination of water due to faeces of birds. The soil of Raiganj Wildlife Sanctuary is mostly acidic, loamy type and the nature of the soil is unique for differential deposition of faeces of birds.
Rosane Cavalcante Fragoso, Brasil
Chief Scientific Officer and Head of a Research Group
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