Abstract：In order to reveal the distribution characteristics of nitrogen in lake sediments of Lake Luoma, Lake Gaoyou, Lake Gehu and Lake Yangcheng in the Eastern Plain and their influence factors, sequential extraction method was employed to determine transferable total nitrogen (TTN) which includes ion exchangeable form nitrogen (IEF-N), weak acid extractable form nitrogen (WAEF-N), strong alkali extractable form nitrogen (SAEF-N) and strong oxidant extractable form nitrogen (SOEF-N), as well as non-extractable form nitrogen (NTN) in sediment. Multivariate statistical analysis combined with physical and chemical properties of sediments such as particle size, pH, content of total organic carbon (TOC) and total phosphorus (TP) were used to discuss the main factors influencing nitrogen distribution. The results showed that TTN was the main form of nitrogen in the sediments of four lakes, SOEF-N was the highest form and IEF-N was the lowest fraction for all the four lakes. The spatial distribution trend of IEF-N, SOEF-N和NTN in the sediments was consistent with that of total nitrogen (TN); the content of TTN in Lake Gehu and Lake Yangcheng was higher than that in Lake Luoma and Lake Gaoyou, Luoma Lake showed the highest spatial variation for different nitrogen forms in four lakes, due to uneven distribution of aquatic plant and a large number of sand mining activities. IEF-N was extremely significantly correlated with TN, suggesting that the change trend of IEF-N was similar to that of TN, which could reflect the level of endogenous pollution release to a certain extent. pH and particle size had a weak influence on nitrogen forms, which ratio of C/N, P input and TOC affected the content and distribution of nitrogen forms in varying degrees, especially for P input and TOC.
赵宝刚, 张夏彬, 昝逢宇, 胡晓康, 潘婷, 刘敏. 不同湖泊表层沉积物氮形态的分布特征与影响因素[J]. 中国环境科学, 2021, 41(2): 837-847.
ZHAO Bao-gang, ZHANG Xia-bin, ZAN Feng-yu, HU Xiao-kang, PAN Ting, LIU Min. Distribution characteristics and influencing factors of nitrogen forms in surface sediments of different lakes. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 837-847.
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