气候变化领域集成服务门户(CCPortal): Controls of point and diffuse sources lowered riverine nutrient concentrations asynchronously, thereby warping molar N:P ratios

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DOI	10.1088/1748-9326/ab98b6
	Controls of point and diffuse sources lowered riverine nutrient concentrations asynchronously, thereby warping molar N:P ratios
	Westphal K.; Musolff A.; Graeber D.; Borchardt D.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	The input of nitrogen (N) and phosphorus (P) into rivers has been reduced in recent decades in many regions of the world to mitigate adverse eutrophication effects. However, legislation focused first on the reduction of nutrient loads from point sources and only later on diffuse sources. These reduction strategies have implications on riverine N:P stoichiometry, which potentially alter patterns of algal nutrient limitation and the functions or community structure of aquatic ecosystems. Here, we use a dataset spanning four decades of water quality for the Ruhr River (Germany) to show that the asynchronous implementation of point and diffuse source mitigation measures combined with time lags of catchment transport processes caused a temporally asynchronous reduction in dissolved inorganic nitrogen and total phosphorus concentrations. This asynchronous reduction increased the molar N:P ratios from around 30 to 100 in the river sections dominated by point sources, reducing the probability of N limitation of algae in favor of P limitation. The Ruhr River catchment and the environmental policies implemented here illustrate the unintended effects of nutrient control strategies on the ecological stoichiometry at the catchment scale. We urge to assess systematically, whether unintentionally warped macronutrient ratios are observable in other managed river systems and to evaluate their environmental impacts. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	catchment management; long-Term monitoring; nitrogen; phosphorus; stoichiometry
语种	英语
scopus关键词	Aquatic ecosystems; Aquatic organisms; Catchments; Environmental protection; Eutrophication; Molar concentration; Molar ratio; Nitrogen; Nutrients; Phosphorus; Rivers; Runoff; Stoichiometry; Water quality; Community structures; Dissolved inorganic nitrogens; Ecological stoichiometry; Environmental policy; Mitigation measures; N:p stoichiometries; Nutrient concentrations; Nutrient limitations; River pollution; community structure; concentration (composition); data set; dissolved inorganic nitrogen; environmental impact; environmental policy; eutrophication; nutrient limitation; water quality; Germany; North Rhine-Westphalia; Ruhr River; algae
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153681
作者单位	Department Aquatic Ecosystem Analysis, Helmholtz Centre for Environmental Research-UFZ, Brückstr. 3a, Magdeburg, 39114, Germany; Department Hydrogeology, Helmholtz Centre for Environmental Research-UFZ, Permoserstr. 15, Leipzig, 04318, Germany
推荐引用方式 GB/T 7714	Westphal K.,Musolff A.,Graeber D.,et al. Controls of point and diffuse sources lowered riverine nutrient concentrations asynchronously, thereby warping molar N:P ratios[J],2020,15(10).
APA	Westphal K.,Musolff A.,Graeber D.,&Borchardt D..(2020).Controls of point and diffuse sources lowered riverine nutrient concentrations asynchronously, thereby warping molar N:P ratios.Environmental Research Letters,15(10).
MLA	Westphal K.,et al."Controls of point and diffuse sources lowered riverine nutrient concentrations asynchronously, thereby warping molar N:P ratios".Environmental Research Letters 15.10(2020).