Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources

Excessive phosphorus has become the primary reason for the deterioration of the water quality of the upper Yangtze River Basin. Here, we comprehensively study variations in total phosphorus (TP) concentration and TP loads in the upper reach of the Yangtze River during 2004–2017 (after the impoundmen...

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Autores principales:	Qian Li, Zhonghua Yang, Yao Yue, Hua Zhong, Da Li
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	loads mainstream non-point source point source total phosphorus tributary Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/3c7cca408f9d48c4a61ca349be57f08c
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spelling	oai:doaj.org-article:3c7cca408f9d48c4a61ca349be57f08c2021-11-06T07:15:30ZVariation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources1606-97491607-079810.2166/ws.2021.015https://doaj.org/article/3c7cca408f9d48c4a61ca349be57f08c2021-06-01T00:00:00Zhttp://ws.iwaponline.com/content/21/4/1687https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Excessive phosphorus has become the primary reason for the deterioration of the water quality of the upper Yangtze River Basin. Here, we comprehensively study variations in total phosphorus (TP) concentration and TP loads in the upper reach of the Yangtze River during 2004–2017 (after the impoundment of the Three Gorges Dam). Non-point source TP loads flowing into the mainstream are also analyzed based on the base flow segmentation method. TP concentration in the mainstream showed a fluctuating trend of decreasing–increasing–decreasing from 2004 to 2017. TP loads from tributaries had a greater impact on TP concentration in the mainstream than the retention effect. Non-point source was an important source of TP loads. Average TP loads from non-point source pollution were 24.9 × 106 kg per year, contributing about 50.8% of the TP loads from 2004 to 2017. Non-point source TP loads were mainly from Jinsha River and Jialing River, accounting for 59.1% of total non-point TP loads, and they mainly occurred in the wet season. The long-term variation trend of TP loads from tributaries was affected by economic development, intensity of pollution control and significant discharge change. In terms of pollution control, we suggest comprehensive treatment of point and non-point source pollution. HIGHLIGHTS TP concentration of mainstream showed a trend of decreasing–increasing–decreasing.; TP loads from tributaries had a greater impact on TP concentration in the mainstream than the retention effect.; Average TP loads from non-point source pollution contributed about 50.8% of total TP loads.; Long-term variation trend of TP loads was affected by economic development, intensity of pollution control and significant discharge change.;Qian LiZhonghua YangYao YueHua ZhongDa LiIWA Publishingarticleloadsmainstreamnon-point sourcepoint sourcetotal phosphorustributaryWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 4, Pp 1687-1700 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	loads mainstream non-point source point source total phosphorus tributary Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	loads mainstream non-point source point source total phosphorus tributary Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Qian Li Zhonghua Yang Yao Yue Hua Zhong Da Li Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources
description	Excessive phosphorus has become the primary reason for the deterioration of the water quality of the upper Yangtze River Basin. Here, we comprehensively study variations in total phosphorus (TP) concentration and TP loads in the upper reach of the Yangtze River during 2004–2017 (after the impoundment of the Three Gorges Dam). Non-point source TP loads flowing into the mainstream are also analyzed based on the base flow segmentation method. TP concentration in the mainstream showed a fluctuating trend of decreasing–increasing–decreasing from 2004 to 2017. TP loads from tributaries had a greater impact on TP concentration in the mainstream than the retention effect. Non-point source was an important source of TP loads. Average TP loads from non-point source pollution were 24.9 × 106 kg per year, contributing about 50.8% of the TP loads from 2004 to 2017. Non-point source TP loads were mainly from Jinsha River and Jialing River, accounting for 59.1% of total non-point TP loads, and they mainly occurred in the wet season. The long-term variation trend of TP loads from tributaries was affected by economic development, intensity of pollution control and significant discharge change. In terms of pollution control, we suggest comprehensive treatment of point and non-point source pollution. HIGHLIGHTS TP concentration of mainstream showed a trend of decreasing–increasing–decreasing.; TP loads from tributaries had a greater impact on TP concentration in the mainstream than the retention effect.; Average TP loads from non-point source pollution contributed about 50.8% of total TP loads.; Long-term variation trend of TP loads was affected by economic development, intensity of pollution control and significant discharge change.;
format	article
author	Qian Li Zhonghua Yang Yao Yue Hua Zhong Da Li
author_facet	Qian Li Zhonghua Yang Yao Yue Hua Zhong Da Li
author_sort	Qian Li
title	Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources
title_short	Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources
title_full	Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources
title_fullStr	Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources
title_full_unstemmed	Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources
title_sort	variation of total phosphorus concentration and loads in the upper yangtze river and contribution of non-point sources
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/3c7cca408f9d48c4a61ca349be57f08c
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Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources

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