福州市浅层地下水的硝化机制
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TU991

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国家自然科学基金(41302209);中国地质调查局地质调查项目(1212011121168,1212011121169)


Nitrification of shallow groundwater in Fuzhou City, China
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    摘要:

    选取福州市范围内2015年42组浅层地下水样品和1个地下水监测点2011—2015年共10期监测数据,通过分析地下水中阴阳离子比例、NO-3浓度百分比与主要水化学指标之间的时空对应关系,讨论了硝酸盐型地下水的形成条件和地下水硝化作用的主要影响因素,分类统计了不同地质成因、不同土地利用类型条件下含水层中地下水样品的硝化程度。结果表明:福州市地下水中硝酸盐型的采样点所占比例为27.9%,地下水硝化程度逐年加重;硝酸盐的输入为地下水的硝化提供了物质基础,酸化进一步促进了地下水的硝化;基岩风化带裂隙水硝化程度最低,第四系冲洪积层次之,残坡积层最高;人类活动强度最高的城市区地下水中硝酸盐型采样点所占比例达41.67%,硝化程度高于其他土地利用类型,是地下水硝化作用最主要的影响因素。

    Abstract:

    Based on 42 shallow groundwater samples of 2015 and ten phases of monitoring data from 2011 to 2015 from a groundwater monitoring site in Fuzhou City, we analyzed the proportions of the main anions and cations in groundwater and compared the temporal-spatial relationship between the percentage concentration of NO-3 and the main hydrochemical indices, in order to study the formation conditions of nitrate-type groundwater and major factors of groundwater nitrification. We also classified the degree of nitrification of groundwater samples from the aquifers with different geological origins and different land use types. The results show that the proportion of nitrate-type groundwater accounted for 27. 9%, and the degree of nitrification was increasing year by year in Fuzhou City. The input of nitrate provided the material basis for the nitrification of groundwater and the acidification accelerated the nitrification of groundwater. The degree of nitrification was at the lowest level in karst water of the bedrock weathering zone, at the middle level in the Quaternary alluvium, and at the highest level in the residual slope layer. The proportion of nitrate-type groundwater of the urban area with the highest intensity of human activities accounted for 41. 67%, which was higher than that of other land use types. We consider human activities the most important factor affecting the nitrification of groundwater.

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周迅,赵汝荣,陈琦.福州市浅层地下水的硝化机制[J].水资源保护,2017,33(4):26-31.(ZHOU Xun, ZHAO Rurong, CHEN Qi. Nitrification of shallow groundwater in Fuzhou City, China[J]. Water Resources Protection,2017,33(4):26-31.(in Chinese))

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  • 收稿日期:2017-04-15
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  • 在线发布日期: 2017-07-12
  • 出版日期: 2017-07-20