Abstract:The total nitrogen (TN) contents and thermodynamics/kinetics of ammonia nitrogen (NH4+-N) release characteristics of Poyang Lake surface exposed sediments were studied, tried to reveal the influence of the water level changed resulted from the relationship between Yangtze Rive and the Poyang Lake changed on the NH4+-N release risk of Poyang Lake sediments. The TN contents of Poyang Lake sediments varied from 377to 3875mg/kg; the adsorption/desorption equilibrium concentrations of NH4+-N(EC0)varied from 1.49to 2.99mg/L; the maximal release potential of NH4+-N varied from 17.00to 140.97mg/kg, the NH4+-N release process was mainly occurred within the 0~5minutes that accounted for 50.84% to 73.34% of the release amount, the TN contents, EC0 concentrations, the maximal release potential and the initial release rate of NH4+-N increased with the height increased, that’s dues to the water from Yangtze river keep reducing,resulting in the low water level advanced and the outcropped time prolonged, then caused the TN contents, EC0 concentrations, the maximal release potential and the initial release rate increased, these factors changed were the important mechanism that caused the NH4+-N release risk increased and the deterioration of water quality. With the Poyang Lake water lever keep lower, it’s bound to lead the sediments exposed area and time increased. then caused the increased of NH4+-N release risk of next year.
何宗健, 吴志强, 倪兆奎, 刘婉清, 王圣瑞. 江湖关系变化对鄱阳湖沉积物氨氮释放风险的影响[J]. 中国环境科学, 2014, 34(5): 1277-1284.
HE Zong-Jian, WU Zhi-Qiang, NI Zhao-Kui, LIU Wan-Qing, WANG Sheng-Rui. The influence of the River-Lake relation changed on the sediments ammonia nitrogen release risk of Poyang Lake. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(5): 1277-1284.