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首页> 外文期刊>Limnology >Lagrangian tracking measurements revealed the temporal dynamics of nitrogen and phosphorus spiralling in a large Japanese river
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Lagrangian tracking measurements revealed the temporal dynamics of nitrogen and phosphorus spiralling in a large Japanese river

机译：拉格朗日跟踪测量显示了大型日本河中螺旋螺旋的时间动态

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摘要

The in-stream processing of nutrients plays an important role in the fluvial nutrient transport from lands to the ocean, but few empirical studies have addressed the temporal dynamics of net nutrient removal rates in large river systems. The present study applied the recently developed Lagrangian approach to the sixth-order Fuji River to identify the seasonal dynamics of in-stream uptake rates for inorganic nitrogen and phosphorus by tracking a specific water parcel along the river course. The Lagrangian measurements revealed temporal variability of nutrient uptake metrics, but the overall pattern showed a net positive uptake of ammonium (NH4) and a net release of nitrite (NO2) and nitrate (NO3) from the riverbed from May through December. The net uptake rates of phosphate (PO4) showed both positive and negative values depending on the sampling periods. Environmental correlates of the net areal uptake rates (U-net) suggested that biological transformation processes such as assimilation for organic matter synthesis and utilization for energy in oxidation-reduction reactions, as well as abiotic sorption processes, influenced the nutrient removal in the Fuji River. The present study highlights that physical factors (temperature and light), reaction substrates and epilithic organisms may responsible for nutrient dynamics in large river ecosystems.
机译：营养物质的流动处理在河流到海洋的河流营养运输中起重要作用，但很少有实证研究已经解决了大型河流系统中净营养去除率的时间动态。目前的研究应用了最近开发的拉格朗日方法来到富士河的第六阶富士河，通过跟踪沿河课程的特定水包来确定无机氮和磷的流量摄取率的季节动态。拉格朗日测量揭示了营养吸收度量的时间变异性，但总体模式显示了氨基铵（NH4）的净阳性摄取，亚硝酸盐（NO2）和硝酸盐（NO3）的净释放来自5月至12月的河床。磷酸盐（PO4）的净吸收率根据抽样周期显示正值和负值。净收射率（U-Net）的环境相关性建议，生物转化过程如有机物质合成和用于氧化还原反应中的能量的同化，以及非生物吸附过程，影响了富士河中的营养去除。本研究强调了物理因素（温度和光），反应底物和脱岩生物可能负责大型河流生态系统中的营养动态。

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