【摘要】 研究了NO₃^--N,NH₄⁺-N在底泥中的扩散、吸附以及NO₃^--N的反硝化等过程.结果表明,在泥-水界面间,NH₄⁺-N主要向上浮水中扩散,NO₃^--N主要向间隙水中扩散.扩散到间隙水中的NO₃^--N45％被吸附,30％因反硝化作用而失掉,其反硝化速率常数在7—11cm层最大.氮的吸附速率常数在表层最大.建立了间隙水中NO₃^--N和NH₄⁺-N的转化模型,并计算了氮在泥-水界面间的扩散量,计算结果与实测结果基本相符.更多还原

【Abstract】 The diffusion and the adsorption of NO8-N and NH4-N and the denr-trification of NO8-N in sediment were studied. NH4-N diffused cross the interface of water-sediment into the water column while NO8-N transferred in another direction.In interstitial water,45 percent of NO8-N from overlying water was adsorbed and 30 percent was lost during denitrifica-tion. The denitrification rate constant of NO8-N reached its maximum between 7-11 cm of the sediment and the maximum adsorption occurred in the top few centimeters of the sediment. Transport models of NO8-N and NH4-N in interstitial water were suggested and applied to calculate the amounts of nitrogen transferred cross the interface.更多还原