宜兴三氿沉积物氮形态分布及其影响因素
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国家水污染控制与治理科技重大专项(2014ZX07315002)


Nitrogen forms in sediments and their influence factors of Sanjiu Lakes in Yixing City
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    摘要:

    为了解宜兴三氿(西氿、东氿和团氿)沉积物氮形态分布及其影响因素,采用连续分级提取法对三氿12个采样点表层沉积物样品中各种形态氮含量进行测定,探讨了不同形态氮的空间分布特征及影响因素。结果表明:总氮的空间分布与沉积物有机质分布存在明显的一致性,团氿含量较高,东、西氿含量较低且基本持平;可转化态氮含量占总氮的 59.5%,对水体潜在危害较大,空间分布呈现出西氿最大、东氿次之、团氿最低的趋势;可转化态氮中4种形态氮含量大小顺序为弱酸可提取态氮、离子交换态氮、强碱可提取态氮、强氧化剂可提取态氮,弱酸可提取态氮为可转化态氮的优势形态;沉积物有机质与总氮和强氧化剂可提取态氮呈极显著正相关关系(P<0.01),pH值与总氮呈显著负相关关系(P<0.05);上覆水总氮与离子交换态氮呈极显著正相关关系(P<0.01),与可转化态氮呈显著正相关关系(P<0.05)。

    Abstract:

    In order to gain a clear idea of the distribution and influencing factors of nitrogen forms in sediments of Xijiu, Dongjiu and Tuanjiu in Yixin, the sequential extraction technique is adopted to determine the contents of various forms of nitrogen in surface sediment samples of 12 sampling points in Sanjiu. The results show that the spatial distribution of total nitrogen is obviously consistent with that of organic matter in sediments. The contents of total nitrogen in Tuanjiu is higher than that in Dongjiu and Xijiu, where the contents of total nitrogen is basically the same. The content of transformable nitrogen accounts for 59.5% of the total nitrogen, which has great potential harm to the water body. The spatial distribution of transformable nitrogen shows the trend of the largest in Xijiu, the second in the Dongjiu and the lowest in Tuanjiu. The order from big to small of contents of four forms of nitrogen in transformable nitrogen is as follows: weak acid extractable nitrogen, ion exchange nitrogen, strong alkali extractable nitrogen, strong oxidant extractable nitrogen. Weak acid extractable nitrogen is the dominant form of transformable nitrogen. The organic matter in sediments has a very significant positive correlation with total nitrogen and extractable nitrogen of strong oxidant(P<0.01). There was a significant negative correlation between pH value and total nitrogen. The total nitrogen in overlying water has a very significant positive correlation with the ion-exchanged nitrogen(P<0.01), while having a significant positive correlation with transformable nitrogen(P<0.05).

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邹民虎,连斌,王晓昌,等.宜兴三氿沉积物氮形态分布及其影响因素[J].水资源保护,2019,35(2):54-59.(ZOU Minhu, LIAN Bin, WANG Xiaochang, et al. Nitrogen forms in sediments and their influence factors of Sanjiu Lakes in Yixing City[J]. Water Resources Protection,2019,35(2):54-59.(in Chinese))

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  • 收稿日期:2018-03-07
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  • 在线发布日期: 2019-03-28
  • 出版日期: 2019-03-20