دراسة سلوك المغذيات (Sio4^-4, Po4^-3, No3^-, NH4 ^+) المنحلة في الماء علي طول تدرج الملوحة لمصب نهر السن (البحر الابيض المتوسط - سوريا)

The study, has Focused on determination of the most important hydrochemical characteristics of AL-sin estuary area via determining the concentration of nutrient ions (nitrate, nitrite, ammonia, phosphates and silicates) and the factors affecting them. In addition, determining chlorophyll a in water samples collected from several locations of that area during the period between March 2011 and February 2012 was done. The highest concentrations of nutrient throughout the year were reported at river estuary point (S0) and converged with nutrient concentrations in the station S50 because of the geographic nature of AL-sin estuary area. A depression in their concentrations was observed in the station distanced away from the river estuary point, compatible with salinity gradient. River estuary point (S0) formed the main source of nutrients that are distributed to the rest of the stations. Nutrient concentrations showed clear gradual depression during the winter months down to 3,000 meters from the estuary point, while the gradient in the summer months has less extension; It was within the first 200 - 500 meters. Statistical study revealed a significant negative relationship between the nutrient concentrations and water salinity and positive relationship between each other. The nitrate showed a significant correlation with phosphate and silicate, while the correlation between nitrite and nitrate and the correlation between nitrite and ammonia were significant but less important.