昌黎黄金海岸自然保护区海域表层沉积物中氮赋存形态分布特征

Distribution of nitrogen in surface sediments of the Golden Beach Ocean Nature Reserve,Changli

本文以昌黎黄金海岸自然保护区海域沉积物为研究对象,分析保护区海域各位点沉积物中氮的赋存形态分布状况与中值粒径、有机质的相关性。结果表明:保护区海域沉积物的总氮(TN,total nitrogen)含量在180.13×10^(-6)~966.00×10^(-6)之间,平均值为638.15×10^(-6);其中非转化态氮(NTN,non-transformed nitrogen)含量在75.82×10^(-6)~856.28×10^(-6)之间,真正参与地球化学循环的可转化态氮(TTN,transferable total nitrogen)含量在104.31×10^(-6)~165.12×10^(-6)之间。各浸取态氮所占TN比例大小为弱酸可浸取态氮(WAEF-N,weak acid exchangeable form,61.69%)>强氧化剂可浸取态氮(SOEF-N,strong oxidant exchangeable form,20.38%)>离子交换态氮(IEF-N,ion exchangeable form,15.40%)>强碱可浸取态氮(SAEF-N,strong alkali exchangeable form,2.53%)。沉积物氮的分布特征主要与陆源营养盐的输入、洋流流向及海洋水动力条件等因素有关;沉积物中有机质含量、粒径分布对各浸取态氮含量的分布影响不大。对比已有统计数据,该保护区海域范围内沉积物基本没有污染状况的发生。

In this paper,the sediment of Changli Gold Coast Nature Reserve is taken as the research object,and the relationship between the distribution of nitrogen forms and the median grain size and organic matter in the sediments of the reserve is analyzed.The results showed that the total nitrogen（TN）content in the sediments of the marine reserve was ranged from 180.13×10^（-6）to 966×10^（-6）,with an average value of 638.15×10^（-6）.The content of non-transformed nitrogen（NTN）ranged from 75.82×10^（-6）to 856.28×10^（-6）,and the content of the transferable total nitrogen（TTN）that was truly involved in geochemical cycle was between 104.31×10^（-6）to 165.12×10^（-6）.The proportion of TN in each extractive nitrogen was WAEF-N（61.69%）〉SOEF-N〉（20.38%）〉IEF-N（15.40%）〉SAEF-N（2.53%）.The distribution characteristics of nitrogen in the sediments were mainly related to the input of terrestrial nutrients,the direction of ocean currents and the hydrodynamic conditions of the oceans.The distribution of organic matter and grain size in sediments had little effect on the distribution of the extracted nitrogen content.Compared with the existing statistical data,there was no pollution in the sediments basically.