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- W2374774429 abstract "Through one year of field observation in the deep and shallow water areas of Lake Qingnian,total nitrogen(TN),exchangeable nitrogen(EN) and fixed ammonium(NH4+-N) in the sediments,pore water and the overlying water were investigated.Seasonal variation of Eh and temperature were also studied.The results showed that TN in the sediments was the highest,and increased closer to the deep water area.Ammonium(NH4+-N) accounted for about 95% of EN,and was the main form of nitrogen which spread from sediments to the surface water.Meanwhile,nitrate(NO3——N) and nitrite(NO2——N) were the lowest in the sediments.As a potential nitrogen source strongly retentive in the sediments,fixed ammonium accounted for 18.57% of TN in the shallow area and 20.84% in the deep area.Statistics revealed that exchangeable ammonium and fixed ammonium declined in spring and summer,while increasing in autumn and winter.However,NO3——N had the opposite seasonal variation.Furthermore,variations in the shallow water were greater than those in the deep water.Lastly,it was found that plant roots and seasonal variation of temperature affects the reduction environment in the surface sediments and the processes of nitrification-denitrification and mineralization." @default.
- W2374774429 created "2016-06-24" @default.
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- W2374774429 date "2012-01-01" @default.
- W2374774429 modified "2023-09-26" @default.
- W2374774429 title "Seasonal Variation of Nitrogen in Sediments of Lake Qingnian" @default.
- W2374774429 hasPublicationYear "2012" @default.
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