Effects of Different Environmental Factors on Sediment Nitrogen Release
In order to study the effect of overlying water conditions on sediment nitrogen in Poyang Lake,the estuarine sediments of Poyang Lake were used as experimental materials.By changing the temperature,pH and disturbance conditions of overlying water,the release charac-teristics of different forms of nitrogen in sediments were studied.The correlation of nitrogen release in sediments under different environmental conditions was fitted with the functions of first order,second order and third order.The results showed that with the increase of temperature,the release of total nitrogen,ammonia nitrogen and nitrate nitrogen increased significantly.Under acidic condition,the release intensity of am-monia nitrogen was the highest,while under alkaline condition,it was the lowest.The release intensity of total nitrogen and nitrate nitrogen was the highest under alkaline condition.Under different disturbance intensities,the release intensity of ammonia nitrogen,total nitrogen and ni-trate nitrogen reached the maximum at 160 r/min.Curve fitting results showed that the release intensity of total nitrogen,ammonia nitrogen and nitrate nitrogen was a function of pH,temperature and disturbance intensity.
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