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dc.contributor.authorTong, Yindong
dc.contributor.authorWang, Mengzhu
dc.contributor.authorPeñuelas, Josep
dc.contributor.authorLiu, Xueyan
dc.contributor.authorPaerl, Hans W.
dc.contributor.authorElser, James J.
dc.contributor.authorSardans, Jordi
dc.contributor.authorCouture, Raoul-Marie
dc.contributor.authorLarssen, Thorjørn
dc.contributor.authorHu, Hongying
dc.contributor.authorDong, Xin
dc.contributor.authorHe, Wei
dc.contributor.authorZhang, Wei
dc.contributor.authorWang, Xuejun
dc.contributor.authorZhang, Yang
dc.contributor.authorLiu, Yi
dc.contributor.authorZeng, Siyu
dc.contributor.authorKong, Xiangzhen
dc.contributor.authorJanssen, Annette B.G.
dc.contributor.authorLin, Yan
dc.date.accessioned2020-09-30T06:44:58Z
dc.date.available2020-09-30T06:44:58Z
dc.date.created2020-09-04T11:03:30Z
dc.date.issued2020
dc.identifier.citationProceedings of the National Academy of Sciences of the United States of America. 2020, 117 (21), 11566-11572.en_US
dc.identifier.issn0027-8424
dc.identifier.urihttps://hdl.handle.net/11250/2680401
dc.descriptionEmbargo until 26 Nov 2020en_US
dc.description.abstractLarge-scale and rapid improvement in wastewater treatment is common practice in developing countries, yet this influence on nutrient regimes in receiving waterbodies is rarely examined at broad spatial and temporal scales. Here, we present a study linking decadal nutrient monitoring data in lakes with the corresponding estimates of five major anthropogenic nutrient discharges in their surrounding watersheds over time. Within a continuous monitoring dataset covering the period 2008 to 2017, we find that due to different rates of change in TN and TP concentrations, 24 of 46 lakes, mostly located in China’s populated regions, showed increasing TN/TP mass ratios; only 3 lakes showed a decrease. Quantitative relationships between in-lake nutrient concentrations (and their ratios) and anthropogenic nutrient discharges in the surrounding watersheds indicate that increase of lake TN/TP ratios is associated with the rapid improvement in municipal wastewater treatment. Due to the higher removal efficiency of TP compared with TN, TN/TP mass ratios in total municipal wastewater discharge have continued to increase from a median of 10.7 (95% confidence interval, 7.6 to 15.1) in 2008 to 17.7 (95% confidence interval, 13.2 to 27.2) in 2017. Improving municipal wastewater collection and treatment worldwide is an important target within the 17 sustainable development goals set by the United Nations. Given potential ecological impacts on biodiversity and ecosystem function of altered nutrient ratios in wastewater discharge, our results suggest that long-term strategies for domestic wastewater management should not merely focus on total reductions of nutrient discharges but also consider their stoichiometric balance.en_US
dc.language.isoengen_US
dc.publisherNational Academy of Sciencesen_US
dc.titleImprovement in municipal wastewater treatment alters lake nitrogen to phosphorus ratios in populated regionsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionacceptedVersionen_US
dc.source.pagenumber11566-11572en_US
dc.source.volume117en_US
dc.source.journalProceedings of the National Academy of Sciences of the United States of Americaen_US
dc.source.issue21en_US
dc.identifier.doi10.1073/pnas.1920759117
dc.identifier.cristin1827323
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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