Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China

Abstract A heavy load of nitrogenous compounds reflects nutrient loss and influences water quality in large rivers. Nitrogenous concentrations and dual isotopes of nitrate were measured to ascertain the spatial and temporal distributions of nitrate transformation in the Yellow River, the second-long...

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Autores principales:	Fu-Jun Yue, Si-Liang Li, Cong-Qiang Liu, Zhi-Qi Zhao, Hu Ding
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5e17ef44c02b44859976a0bcf861946c
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spelling	oai:doaj.org-article:5e17ef44c02b44859976a0bcf861946c2021-12-02T11:40:21ZTracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China10.1038/s41598-017-08756-72045-2322https://doaj.org/article/5e17ef44c02b44859976a0bcf861946c2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08756-7https://doaj.org/toc/2045-2322Abstract A heavy load of nitrogenous compounds reflects nutrient loss and influences water quality in large rivers. Nitrogenous concentrations and dual isotopes of nitrate were measured to ascertain the spatial and temporal distributions of nitrate transformation in the Yellow River, the second-longest river in China. Assessment of the long-term record indicates that [NO3 −–N] has increased by two-fold over the past three decades. Weekly observation of ammonium over a twelve-year period revealed high concentrations and suggests impairment of water quality, particularly since 2011. The estimated total dissolved nitrogen flux was 7.2 times higher in middle reaches than that at head waters. Anthropogenic nitrogen sources become more important in lower section of the upper reaches and middle reaches because of intensive agricultural activities and urban input. Nitrate in the lower reaches was mainly derived from transportation of upstream nitrate and point sources from cities. The spatial variation of ammonium and nitrate isotopes show that nitrification is a key process governing nitrogen transformation. Riverine biological processes could potentially be responsible for the shift of nitrate isotope signature. The first step to reducing nitrogen load and improving water quality will be containment and careful management of sources from urban input, sewage waste and irrigation runoff.Fu-Jun YueSi-Liang LiCong-Qiang LiuZhi-Qi ZhaoHu DingNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fu-Jun Yue Si-Liang Li Cong-Qiang Liu Zhi-Qi Zhao Hu Ding Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China
description	Abstract A heavy load of nitrogenous compounds reflects nutrient loss and influences water quality in large rivers. Nitrogenous concentrations and dual isotopes of nitrate were measured to ascertain the spatial and temporal distributions of nitrate transformation in the Yellow River, the second-longest river in China. Assessment of the long-term record indicates that [NO3 −–N] has increased by two-fold over the past three decades. Weekly observation of ammonium over a twelve-year period revealed high concentrations and suggests impairment of water quality, particularly since 2011. The estimated total dissolved nitrogen flux was 7.2 times higher in middle reaches than that at head waters. Anthropogenic nitrogen sources become more important in lower section of the upper reaches and middle reaches because of intensive agricultural activities and urban input. Nitrate in the lower reaches was mainly derived from transportation of upstream nitrate and point sources from cities. The spatial variation of ammonium and nitrate isotopes show that nitrification is a key process governing nitrogen transformation. Riverine biological processes could potentially be responsible for the shift of nitrate isotope signature. The first step to reducing nitrogen load and improving water quality will be containment and careful management of sources from urban input, sewage waste and irrigation runoff.
format	article
author	Fu-Jun Yue Si-Liang Li Cong-Qiang Liu Zhi-Qi Zhao Hu Ding
author_facet	Fu-Jun Yue Si-Liang Li Cong-Qiang Liu Zhi-Qi Zhao Hu Ding
author_sort	Fu-Jun Yue
title	Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China
title_short	Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China
title_full	Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China
title_fullStr	Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China
title_full_unstemmed	Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China
title_sort	tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the yellow river, china
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/5e17ef44c02b44859976a0bcf861946c
work_keys_str_mv	AT fujunyue tracingnitratesourceswithdualisotopesandlongtermmonitoringofnitrogenspeciesintheyellowriverchina AT siliangli tracingnitratesourceswithdualisotopesandlongtermmonitoringofnitrogenspeciesintheyellowriverchina AT congqiangliu tracingnitratesourceswithdualisotopesandlongtermmonitoringofnitrogenspeciesintheyellowriverchina AT zhiqizhao tracingnitratesourceswithdualisotopesandlongtermmonitoringofnitrogenspeciesintheyellowriverchina AT huding tracingnitratesourceswithdualisotopesandlongtermmonitoringofnitrogenspeciesintheyellowriverchina
_version_	1718395644590161920

Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China

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