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External Sources Inhibit Benthic Phosphorus Fluxes in the Lower Great Miami River, Southwest Ohio.
Environmental Toxicology and Chemistry ( IF 4.1 ) Pub Date : 2020-05-10 , DOI: 10.1002/etc.4746
Kortney R Mullen 1 , Chad R Hammerschmidt 1 , Michael P Ekberg 2 , Mark J McCarthy 1 , Silvia E Newell 1 , Alison M Agather 1
Affiliation  

Human activities have increased nutrient loadings to aquatic ecosystems, especially during the past century. During low river flow in late summer and early fall, elevated concentrations of phosphorus (P) and nitrogen are present in the temperate Lower Great Miami River and contribute to its eutrophication. Although wastewater treatment plants are suspected of being major sources of P to the river, riverbed sediment has not been examined as an additional potential source of P. Benthic P fluxes were measured at 11 representative locations along the Lower Great Miami River during 3 sampling campaigns in late summer and early fall of 2015. Benthic fluxes of filtered total P (range, −1.6−12 mg m−2 d−1) were related inversely to filtered total P concentrations in river water (p  = 0.002, r  = −0.60). This relationship suggests that elevated P in river water inhibits mobilization from sediment, likely by minimizing the concentration gradient between porewater and overlying water. To effectively mitigate long‐term effects of legacy P stored in Lower Great Miami River sediments, external sources must continue to be managed and discharges reduced to allow legacy P to be mobilized and flushed from the system. Reducing nutrient loading will help protect water quality in the Lower Great Miami River, in other comparable rivers, and in downstream aquatic habitats. Environ Toxicol Chem 2020;39:1517–1525. © 2020 SETAC

中文翻译:

外部来源抑制了俄亥俄州西南部大迈阿密河下游的底栖磷通量。

人类活动增加了水生生态系统的养分含量,尤其是在过去的一个世纪中。在夏末和初秋的河流流量低迷期间,温带大迈阿密河下游存在高浓度的磷(P)和氮,有助于其富营养化。尽管怀疑废水处理厂是河流中P的主要来源,但尚未检查河床沉积物作为P的其他潜在来源。在2004年进行的3次采样期间,在大迈阿密河下游的11个代表性地点测量了底栖P通量。 2015年夏末和初秋。过滤后的总磷(范围为-1.6-12mg m -2  d -1)的底栖通量与河水中过滤后的总P浓度成反比(p  = 0.002,r  = -0.60)。这种关系表明,河水中磷的升高会抑制孔隙水和上覆水之间的浓度梯度,从而抑制了泥沙的迁移。为了有效地缓解迈阿密大河下游沉积物中的遗留磷的长期影响,必须继续管理外部资源并减少排放量,以便从系统中调集和清除遗留磷。减少养分含量将有助于保护大迈阿密河下游,其他可比河流以及下游水生栖息地的水质。2020年《环境毒理学》; 39:1517–1525。©2020 SETAC
更新日期:2020-05-10
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