globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13498
论文题名:
Unexpected release of phosphate and organic carbon to streams linked to declining nitrogen depositions
作者: Musolff A.; Selle B.; Büttner O.; Opitz M.; Tittel J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:5
起始页码: 1891
结束页码: 1901
语种: 英语
英文关键词: atmospheric deposition ; carbon cycle ; nitrogen biogeochemistry ; organic matter ; riparian zone ; streamwater chemistry
英文摘要: Reductions in emissions have successfully led to a regional decline in atmospheric nitrogen depositions over the past 20 years. By analyzing long-term data from 110 mountainous streams draining into German drinking water reservoirs, nitrate concentrations indeed declined in the majority of catchments. Furthermore, our meta-analysis indicates that the declining nitrate levels are linked to the release of dissolved iron to streams likely due to a reductive dissolution of iron(III) minerals in riparian wetland soils. This dissolution process mobilized adsorbed compounds, such as phosphate, dissolved organic carbon and arsenic, resulting in concentration increases in the streams and higher inputs to receiving drinking water reservoirs. Reductive mobilization was most significant in catchments with stream nitrate concentrations <6 mg L−1. Here, nitrate, as a competing electron acceptor, was too low in concentration to inhibit microbial iron(III) reduction. Consequently, observed trends were strongest in forested catchments, where nitrate concentrations were unaffected by agricultural and urban sources and which were therefore sensitive to reductions of atmospheric nitrogen depositions. We conclude that there is strong evidence that the decline in nitrogen deposition toward pre-industrial conditions lowers the redox buffer in riparian soils, destabilizing formerly fixed problematic compounds, and results in serious implications for water quality. © 2016 John Wiley & Sons Ltd
资助项目: We thank the reservoir management authorities who made the chemical and hydrological data obtained within their monitoring programs available to us. The State Reservoir Administration Saxony, Germany (Landestalsperrenverwaltung), supplied the data for the Wilzsch and the State Authority for Environmental Protection, Agriculture and Geology (LfULG) Saxony provided the deposition data. Stefan Heider derived data on land use. We also thank Jan H. Fleckenstein, Matthias Koschorreck, Gunnar Lischeid, Marieke R. Oosterwoud, Marie J. Kurz and Thorsten Reemtsma for valuable discussions on this topic. The work was supported by the Federal Ministry of Education and Research Germany (BMBF, 02WT1290A). The authors declare no conflict of interest.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60958
Appears in Collections:影响、适应和脆弱性

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作者单位: Department Hydrogeology, UFZ – Helmholtz-Centre for Environmental Research, Permoserstr. 15, Leipzig, Germany; Institute of Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Str. 24-25, Potsdam-Golm, Germany; Department Aquatic Ecosystem Analysis, UFZ – Helmholtz-Centre for Environmental Research, Brückstr. 3a, Magdeburg, Germany; IDUS Biologisch-Analystisches Umweltlabor GmbH, Radeberger Str. 1, Ottendorf-Okrilla, Germany; Department Lake Research, UFZ – Helmholtz-Centre for Environmental Research, Brückstr. 3a, Magdeburg, Germany; Department of Civil Engineering and Geoinformation, Beuth University of Applied Sciences, Luxemburger Straße 10, Berlin, Germany

Recommended Citation:
Musolff A.,Selle B.,Büttner O.,et al. Unexpected release of phosphate and organic carbon to streams linked to declining nitrogen depositions[J]. Global Change Biology,2017-01-01,23(5)
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