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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Nitrogen cycling processes andmicrobial community composition in bed sediments in the Yukon River at Pilot Station
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Nitrogen cycling processes andmicrobial community composition in bed sediments in the Yukon River at Pilot Station

机译：育空河试点站床沉积物中的氮循环过程和微生物群落组成

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摘要

Information on the contribution of nitrogen (N)-cycling processes in bed sediments to river nutrient fluxes in large northern latitude river systems is limited. This study examined the relationship between N-cycling processes in bed sediments and N speciation and loading in the Yukon River near its mouth at the Bering Sea. We conducted laboratory bioassays to measure N-cycling processes in sediment samples collected over distinct water cycle seasons. In conjunction, the microbial community composition in the bed sediments using genes involved in N-cycling (narG, napA, nosZ, and amoA) and 16S rRNA gene pyrosequences was examined. Temporal variation was observed in net N mineralization, nitrate uptake, and denitrification rate potentials and correlated strongly with sediment carbon (C) and extractable N content and microbial community composition rather than with river water nutrient concentrations. The C content of the bed sediment was notably impacted by the spring flood, ranging from 1.1% in the midst of an ice-jam to 0.1% immediately after ice-out, suggesting a buildup of organic material (OM) prior to scouring of the bed sediments during ice break up. The dominant members of the microbial community that explained differences in N-processing rates belonged to the genera Crenothrix, Flavobacterium, and the family of Comamonadaceae. Our results suggest that biogeochemical processing rates in the bed sediments appear to be more coupled to hydrology, nutrient availability in the sediments, and microbial community composition rather than river nutrient concentrations at Pilot Station.
机译：关于北部北部大型河流系统中河床沉积物中氮（N）循环过程对河流养分通量的贡献的信息有限。这项研究研究了白令海河口附近育空河床沉积物中氮循环过程与氮形态和负荷之间的关系。我们进行了实验室生物测定，以测量不同水循环季节收集的沉积物样品中的N循环过程。结合起来，使用与N循环有关的基因（narG，napA，nosZ和amoA）和16S rRNA基因焦磷酸序列，研究了床底沉积物中的微生物群落组成。在净氮矿化，硝酸盐吸收和反硝化速率潜力中观察到时间变化，并且与沉积物碳（C），可提取氮含量和微生物群落组成密切相关，而不与河水养分浓度相关。春季洪水对河床沉积物的C含量有显着影响，范围从冰夹层中的1.1％到冰出后立即达到0.1％，这表明冲刷之前有机物（OM）的积累。冰层破裂时床层沉积物破裂。微生物群落的主要成员解释了N加工速率的差异，属于Crenothrix，Flavobacterium和Comamonadaceae家族。我们的结果表明，河床沉积物中的生物地球化学处理速率似乎与水文，沉积物中的养分利用率和微生物群落组成更相关，而不是试点站的河流养分浓度。

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