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Internal nutrient flux in an inland water supply reservoir, New South Wales, Australia

机译：澳大利亚新南威尔士州内陆供水水库的内部养分通量

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Nutrient dynamics at the water-sediment interface in the Suma Park Reservoir, Australia, was assessed under simulated laboratory conditions using intact sediment cores. This laboratory experiment demonstrated that the nutrient influx between the sediment and the water column, in both oxic and anoxic environments, contributed substantially to the total nutrient budget and overall recycling of the biologically available nutrients in the reservoir. This study also confirmed that the bottom sediments act as a source of ammonium-nitrogen (NH_4-N) and filterable reactive phosphorus (FRP), but function as a sink for nitrate-nitrogen (NO_3-N). Extrapolation of the experiment data revealed that the highest nutrient flux was obtained under a summer-anoxic incubation, with the internal loads of FRP and NH_4-N accounting for ≈ 365% and 338% of their external annual loads, respectively. The internal loss of NO_3-N from the summer anoxic incubation was ≈ 7% of its external annual load. The temperature and dissolved oxygen concentration were the most important factors influencing the nutrient flux and internal loading. Denitrification was believed to be an eminent route of nitrate loss from the reservoir.
机译：在模拟的实验室条件下，使用完整的沉积物岩心评估了澳大利亚苏马公园水库水-沉积物界面的营养动态。这项实验室实验表明，在有氧和无氧环境中，沉积物和水柱之间的养分涌入，对总养分预算和储层中可生物利用的养分的总体回收有很大贡献。这项研究还证实，底部沉积物可作为铵态氮（NH_4-N）和可过滤活性磷（FRP）的来源，但可作为硝态氮（NO_3-N）的汇。实验数据的外推显示，在夏季缺氧的条件下，养分通量最高，FRP和NH_4-N的内部负荷分别占外部年度负荷的约365％和338％。夏季缺氧培养中NO_3-N的内部损失约为其外部年负荷的7％。温度和溶解氧浓度是影响养分通量和内部负荷的最重要因素。认为反硝化是从储层中损失硝酸盐的重要途径。

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