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Using multivariate techniques to assess the effects of urbanization on surface water quality: a case study in the Liangjiang New Area, China

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Abstract

Rapid urbanization in China has been causing dramatic deterioration in the water quality of rivers and threatening aquatic ecosystem health. In this paper, multivariate techniques, such as factor analysis (FA) and cluster analysis (CA), were applied to analyze the water quality datasets for 19 rivers in Liangjiang New Area (LJNA), China, collected in April (dry season) and September (wet season) of 2014 and 2015. In most sampling rivers, total phosphorus, total nitrogen, and fecal coliform exceeded the Class V guideline (GB3838-2002), which could thereby threaten the water quality in Yangtze and Jialing Rivers. FA clearly identified the five groups of water quality variables, which explain majority of the experimental data. Nutritious pollution, seasonal changes, and construction activities were three key factors influencing rivers’ water quality in LJNA. CA grouped 19 sampling sites into two clusters, which located at sub-catchments with high- and low-level urbanization, respectively. One-way ANOVA showed the nutrients (total phosphorus, soluble reactive phosphorus, total nitrogen, ammonium nitrogen, and nitrite), fecal coliform, and conductivity in cluster 1 were significantly greater than in cluster 2. Thus, catchment urbanization degraded rivers’ water quality in Liangjiang New Area. Identifying effective buffer zones at riparian scale to weaken the negative impacts of catchment urbanization was recommended.

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Acknowledgements

This work was funded by the Major National Project for Water Pollution Control (2012ZX07307-001). The authors are grateful to the Chongqing Geographic Information Center for providing land use map of the Liangjiang New Area.

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Correspondence to Xuebin Hu.

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Appendix

Table 5 Environmental quality standards for surface water of China (GB3838–2002)

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Luo, K., Hu, X., He, Q. et al. Using multivariate techniques to assess the effects of urbanization on surface water quality: a case study in the Liangjiang New Area, China. Environ Monit Assess 189, 174 (2017). https://doi.org/10.1007/s10661-017-5884-8

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