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Water 2018, 10(7), 864; https://doi.org/10.3390/w10070864

Water Quality in Representative Tuojiang River Network in Southwest China

1
State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P.O. Box 2871, Beijing 100085, China
2
University of Chinese Academy of Science, Beijing 100049, China
3
Zhongke Tongde (Beijing) Ecology Technology Co., Ltd., Beijing 100124, China
*
Author to whom correspondence should be addressed.
Received: 25 February 2018 / Revised: 29 March 2018 / Accepted: 5 April 2018 / Published: 29 June 2018
(This article belongs to the Section Water Quality and Ecosystems)
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Abstract

To control pollutants in rivers, we need to have an understanding of the spatial and temporal variations on water quality in complex river networks. In this study, 153 sampling sties were located in Chengdu segment of Tuojiang River in 2017, 23 monitoring stations in Tuojiang River in the Chengdu segment from 2011 to 2016 were also collected. According to the data from the monitoring station, the concentrations of total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH4+), and chemical oxygen demand (CODcr) concentrations were exceeded the water quality targets at 22, 14, 10, and 3 of the 23 monitoring stations, respectively. The regression analysis showed the NH3, TN and TP was increased from 2011 to 2016 (R2NH4+ = 0.30, p < 0.05; R2TN = 0.88, p < 0.05; R2TP = 0.30, p < 0.05), which indicated water quality was deteriorated from 2011 to 2016. In the 153 sample sites, the NH4+, CODcr, TP and TN concentrations exceeded the class III water quality threshold at 23%, 23%, 26%, and 99% of the total sampling sites, respectively. Correlation analysis showed that the main sources of NH4+, CODcr, TN, and TP (R2NH4+-CODcr = 0.572; R2NH4+-TN = 0.543; R2NH4+-TP = 0.537, p < 0.01) were municipal domestic sewage. The main pollutants in Tuojiang river network were TN and TP, high P and N concentrations probably contribute to the deterioration of surface water quality at some sampling sites (R2TPs-TP = 0.183 and R2TNs-NH4+ = 0.472, p < 0.01). TP, TN, TP in the sediments (TPs), and TN in the sediments (TNs) have accumulated in the river system because the river morphology has been changed by, for example, the damage of riparian zones and the construction of water conservation structures. The results from this study will support initiatives to improve the overall water quality and function of the river ecosystem. View Full-Text
Keywords: river network; water quality; sediment; river ecosystem; riparian zone river network; water quality; sediment; river ecosystem; riparian zone
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Zhang, W.; Jin, X.; Cao, H.; Zhao, Y.; Shan, B. Water Quality in Representative Tuojiang River Network in Southwest China. Water 2018, 10, 864.

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