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首页> 外文期刊>Estuarine Coastal and Shelf Science >The nitrogen isotopic composition of dissolved nitrate in the Yangtze River (Changjiang) estuary, China
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The nitrogen isotopic composition of dissolved nitrate in the Yangtze River (Changjiang) estuary, China

机译：长江（长江）河口溶解硝酸盐的氮同位素组成

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摘要

The nitrogen isotopic composition of dissolved nitrate (δ~(15)N-NO_3~-) in surface water of the Yangtze River estuary was determined in four seasons of 2006. δ~(15)N-NO_3~- ranged from 0.4‰, to 6.5‰, and varied with seasons and geographic regions, reflecting the dynamics of nitrogen cycling in the estuarine ecosystem. δ~(15)N-NO_3~- was markedly lower in February than in other seasons and exhibited conservative mixing, which was probably attributed to the NO3 being sourced from the atmospheric deposition and agricultural fertilizer. In the upper estuary, the influence of riverine inputs was important during all surveys. In the turbidity maximum zone, nitrification was found with nitrate depleted in ~(15)N in May, whereas denitrification resulting in heavy δ~(15)N-NO_3~- played an important role in August. More enriched δ~(15)N-NO_3~-values coinciding with losses of nitrate concentrations based on the conservative mixing model were found in the adjacent marine area in May, and may reflect obvious phytoplankton assimilation of dissolved nitrate. In this manner, δ~(15)N-NO_3~- may be a sensitive indicator of nitrogen sources and biogeochemical processing existing in this estuary in conjunction with the variations of dissolved nitrate and other environmental factors.
机译：在2006年的四个季节中确定了长江口地表水中溶解硝酸盐的氮同位素组成（δ〜（15）N-NO_3〜-）。δ〜（15）N-NO_3〜-范围为0.4‰，到6.5‰，并且随季节和地理区域而变化，反映了河口生态系统中氮循环的动态。 2月的δ〜（15）N-NO_3〜-明显低于其他季节，并且表现出保守的混合态，这可能归因于NO3来自大气沉积物和农业肥料。在上河口，河流调查的影响在所有调查中都很重要。在最大浊度区中，硝化作用发生在5月〜（15）N中，硝酸盐被耗尽，而反硝化作用导致δ〜（15）N-NO_3〜-的重载在8月起了重要作用。根据保守的混合模型，5月份在邻近海域发现了更丰富的δ〜（15）N-NO_3〜值，与硝酸盐浓度的损失相吻合，这可能反映了溶解的硝酸盐对浮游植物的同化作用。以这种方式，δ〜（15）N-NO_3-〜-可能是该河口中氮源和生物地球化学过程与溶解的硝酸盐变化和其他环境因素相结合的敏感指标。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2009年第4期|641-650|共10页
  • 作者

    Xiujuan Liu; Zhiming Yu; Xiuxian Song; Xihua Cao;

  • 作者单位

    Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China Graduate School of the Chinese Academy of Sciences, 100039 Beijing, China;

    Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;

    Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;

    Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;

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  • 正文语种 eng
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  • 关键词

    nitrogen isotopes; surface water; seasonal variations; biogeochemical processing; nitrogen cycle; China, Shanghai, yangtze river estuary;

    机译：氮同位素地表水;季节变化;生物地球化学处理;氮循环中国;上海;长江河口;

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