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首页> 外文期刊>Science of the total environment >Effect of simulated tidal cycle on DOM, nitrogen and phosphorus release from sediment in Dagu River-Jiaozhou Bay estuary
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Effect of simulated tidal cycle on DOM, nitrogen and phosphorus release from sediment in Dagu River-Jiaozhou Bay estuary

机译：大都河 - 胶州湾河口沉积物中模拟潮汐循环对Dom，氮和磷释放的影响

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摘要

Tide drives salt mixing processes, erosion, deposition, and nutrient circulation in sediments, which is critical to the estuarine systems. This study aims to investigate the effects of tidal cycle intensity on sediment dissolved organic matter (DOM), nitrogen and phosphorus release. In this study, the effects of tide are investigated by simulating different intensity of tidal disturbance with tidal simulator devices. The microbial community changes under different tidal cycle are disclosed to explain the mechanism of nutrient release. In addition, the short-term release of nitrogen and phosphorus under simulated tidal cycle is predicted by stepwise regression method. Results show that the higher the tidal cycle intensity, the stronger the DOM mineralization in sediments and diffusion into overlying water, leading to a sustained increase of fluorescence intensity in DOM. Besides, the tidal disturbance promotes the NH_4~+-N and NO_3~--N release and the tidal disturbance is helpful for ammonification. While the greater the tidal intensity, the lower the NO_3~--N release. Content of released total phosphorus (TP) maintains at a low level and fluctuates over time under different simulated tidal intensity. In addition, tidal cycle greatly changes the microbial richness and diversity. Gammaproteobactere has the ability of denitrification and can reduce nitrate to nitrite. Besides, tidal environment greatly affects the abundance of Marinobacter which can enhance the N, P, and C migration transformation ability. The research on microbial community further explains the mechanism of nutrient release. The model of nitrogen and phosphorus release contributes to providing basic data for predicting the short-term release of nutrients under different simulated tidal intensity.
机译：潮汐驱动沉积物中的盐混合过程，腐蚀，沉积和营养循环，这对酯氨基系统至关重要。本研究旨在探讨潮汐循环强度对沉积物溶解有机物（DOM），氮和磷释放的影响。在这项研究中，通过模拟与潮汐模拟器装置的不同潮汐干扰强度来研究潮汐的影响。公开了不同潮汐循环下的微生物群落变化以解释营养释放的机制。此外，通过逐步回归法预测了模拟潮汐循环下的氮和磷的短期释放。结果表明，潮汐循环强度越高，沉积物中的DOM矿化越强，沉积物和覆盖物中的扩散越强，导致DOM中荧光强度持续增加。此外，潮干扰动促进NH_4〜+ -N和NO_3〜 - 释放，潮汐干扰有助于氨化。虽然潮汐强度越大，NO_3〜 - 释放越低。释放的总磷（TP）的含量在低水平下维持，并在不同模拟的潮汐强度下随着时间的推移波动。此外，潮汐循环大大改变了微生物丰富和多样性。 GammaProtebactere具有反硝化的能力，可以将硝酸盐降低到亚硝酸盐。此外，潮汐环境极大地影响了可以增强N，P和C迁移变换能力的大量的大量的野生杆菌。微生物群落的研究进一步解释了营养释放的机制。氮和磷释放模型有助于提供基本数据，以便在不同模拟潮汐强度下预测营养素短期释放。

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  • 来源
    《Science of the total environment》 |2021年第20期|147158.1-147158.14|共14页
  • 作者

    Xinjuan Wang; Fanlong Kong; Yue Li; Qinghao Li; Chunrong Wang; Junlong Zhang; Min Xi;

  • 作者单位

    College of Environmental Science and Engineering Qingdao University Qingdao 266071 China;

    College of Environmental Science and Engineering Qingdao University Qingdao 266071 China;

    College of Environmental Science and Engineering Qingdao University Qingdao 266071 China;

    College of Environmental Science and Engineering Qingdao University Qingdao 266071 China;

    College of Mathematics and Statistics Qingdao University Qingdao 266071 China;

    College of Environmental Science and Engineering Qingdao University Qingdao 266071 China;

    College of Environmental Science and Engineering Qingdao University Qingdao 266071 China;

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  • 正文语种 eng
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  • 关键词

    DOM; Nitrogen; Phosphorus; Sediment; Simulated tidal cycle; Stepwise regression method;

    机译：DOM;氮;磷;沉淀;模拟潮汐循环;逐步回归方法;

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