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中文摘要：
沉积物对NH4^＋-N的吸附是氮素生物地球化学循环的关键过程之一，它在河口潮滩生态系统内氮素循环过程中起着非常重要的作用．以长江口滨岸潮滩为研究区域，运用实验模拟的方法，研究了沉积物对NH4^＋-N的吸附特征，结果表明，在长江口潮滩上覆水和孔隙水中NH4^＋-N含量的变化范围内，沉积物对NH4^＋-N的吸附呈线性变化；研究区域内沉积物对NH4^＋-N的吸附系数为3．81～9．00，且与沉积物中有机碳（TOC）含量有良好的相关关系，它揭示了有机质控制着长江口潮滩沉积物中NH4^＋-N的吸附行为．实验模拟与实测结果对比发现，在潮滩自然环境条件下，研究区域内沉积物对NH4^＋-N的吸附处在非热力学平衡状态过程中．盐度是影响NH4^＋-N吸附过程的重要环境因子，且导数方程关系式在低盐度范围内，盐度的微小变化对NH4^＋-N的吸附有显著的影响．
英文摘要：
Adsorption of sediments on NH4^＋-N is one of the key biogeochemical processes, which plays an important role in the cycle of nitrogen in an estuary and tidal flats. NH4^＋-N adsorbed by intertidal surface sediments was studied with simulation experiment from the Changjiang Estuary. It is indicated that the adsorption of sediments on NH4^＋-N shows linear Changes in the possible range of NH4^＋-N in overlying waters and porewaters from the intertidal flat of the Changjiang Estuary. The adsorption coefficients of NH4^＋-N vary from 3. 81 to 9.00, and are closely related to sedimentary organic carbon, showing that organic matter may control NH4^＋-N adsorption behavior. Compared with the in situ measured data, it is concluded that NH4^＋-N adsorption is under the non-thermodynamic balance status under natural conditions in the Changjiang Estuary. In addition, it is also showed that salinity has an important effect on NH4^＋-N adsorption, and that the little change of salinity has a pronounced influence on NH4^＋-N adsorption in sediments within the range of lower salinity.
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