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首页> 外文期刊>Environmental Science & Technology >Effect of Water Chemistry and Hydrodynamics on Nitrogen Transformation Activity and Microbial Community Functional Potential in Hyporheic Zone Sediment Columns
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Effect of Water Chemistry and Hydrodynamics on Nitrogen Transformation Activity and Microbial Community Functional Potential in Hyporheic Zone Sediment Columns

机译:水化学和流体力学对沉积区氮沉降柱中氮转化活性和微生物群落功能势的影响

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摘要

Hyporheic zones (HZ) are active biogeochemical regions where groundwater and surface water mix. Ν transformations in HZ sediments were investigated in columns with a focus on understanding how the dynamic changes in groundwater and surface water mixing affect microbial community and its biogeochemical function with respect to Ν transformations. The results indicated that denitrification, DNRA, and nitrification rates and products changed quickly in response to changes in water and sediment chemistry, fluid residence time, and groundwater- surface water exchange. These changes were accompanied by the zonation of denitrification functional genes along a 30 cm advective flow path after a total of 6 days' elution of synthetic groundwater with fluid residence time >9.8 h. The shift of microbial functional potential toward denitrification was correlated with rapid NO_3~ reduction collectively affected by NO_3~~ concentration and fluid residence time, and was resistant to short-term groundwater-surface water exchange on a daily basis. The results implied that variations in microbial functional potential and associated biogeochemical reactions in the HZ may occur at space scales where steep concentration gradients present along the flow path and the variations would respond to dynamic HZ water exchange over different time periods common to natural and managed riverine systems.
机译:亲水区(HZ)是活跃的生物地球化学区域,地下水和地表水混合。在专栏中研究了HZ沉积物中的N转化,重点是了解地下水和地表水混合的动态变化如何影响微生物群落及其相对于N转化的生物地球化学功能。结果表明,随着水和沉积物化学,流体停留时间以及地下水-地表水交换的变化,反硝化,DNRA,硝化速率和产物迅速变化。这些变化伴随着在总停留时间> 9.8 h的合成地下水共洗脱6天后沿30 cm对流流动路径的反硝化功能基因区划。微生物功能势向反硝化的转移与NO_3 ~~浓度和流体停留时间共同影响的NO_3〜快速还原有关,并且每天抵抗短期的地下水-地表水交换。结果表明,HZ中微生物功能潜能的变化和相关的生物地球化学反应可能发生在空间尺度上,在该尺度上,沿流径存在陡峭的浓度梯度,并且该变化将响应自然和管理河流共同不同时期的动态HZ水交换。系统。

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  • 来源
    《Environmental Science & Technology》 |2017年第9期|4877-4886|共10页
  • 作者单位

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States ,School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States ,School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangzhou 518055, China;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States ,School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, China;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States ,School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, China;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States ,School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, China;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States ,Institute of Hydraulic and Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, Zhejiang 310018, China;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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