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首页> 外文期刊>Journal of the American Water Resources Association >Spatial and Temporal Variations in Phosphorus Loads in the Illinois River Basin, Illinois USA
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Spatial and Temporal Variations in Phosphorus Loads in the Illinois River Basin, Illinois USA

机译：Spatial and Temporal Variations in Phosphorus Loads in the Illinois River Basin, Illinois USA

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Total phosphorus (TP) loads in many rivers in the north-central United States have increased,including the Illinois River at Valley City, Illinois, USA, which increased 39% from the periods 1989–1996 to2015–2019 despite efforts to reduce loads from point and nonpoint sources. Here, we quantify long-term variationsin phosphorus (P) loads in the Illinois River and its tributaries and identify factors that may be causingthe variations. We calculated river loads of dissolved (DP) and particulate P (PP), total and volatile suspendedsolids (TSS and VSS), and other potentially related constituents at 41 locations. DP loads generally increasedand PP and TSS loads generally decreased from 1989–1996 to 2015–2019. During 1989–1996, P accumulated inthe lower basin between Marseilles and Valley City (excluding monitored tributaries). This portion of the basinis very flat and accumulates sediment. During 2015–2019, this section shifted from being a net sink to being anet source of P, accounting for 78% of the increased TP load at Valley City. We present evidence supporting severalmechanisms that could have caused this shift: increased DP and chloride loads, reduced sulfate and nitrateconcentrations influencing ionic strength and redox potential in the sediments, and increased VSS loads at ValleyCity possibly indicating greater algal production and contributing to hypoxia in lower river sediments. Additionalresearch is needed to quantify the relative importance of these mechanisms.

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