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| Temporospatial variations and influential factors of water quality in the flowing river systems of western Taihu Lake Basin |
| WANG Qian, WU Ya-dong, DING Qing-ling, ZHANG Qiong-hua, WANG Xiao-chang |
| School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710000, China |
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Abstract The temporospatial variations and factors influencing the water quality of Nanxi and Taoge river systems in the Taihu Upper-River Basin were evaluated.The results showed that Nanxi and Taoge river systems were characterized by TN pollution.The average concentrations of TN and NH4-N in the Taoge river system were higher than that in the Nanxi river system.Moreover,the seasonal variations were significant for bioavailable pollutants (DO,BOD5,TN and NH4-N),the concentrations of which were significantly higher in spring and winter than that in summer and autumn.Spatially,the water quality parameters (except TN) in the mountainous area was prominently superior to other areas.However,the water quality was the worst in large-scale aquaculture areas.The rain sewage diversion and greenbelt in urban areas are beneficial for the reduction of TN pollution.By contrast,agriculture runoff and domestic and livestock wastewater from the villages and towns exacerbate the TN pollution.Furthermore,the aquaculture wastewater aggravates the BOD5 and NH4-N pollution.Therefore,the management of aquaculture wastewater,agricultural runoff,as well as domestic and livestock wastewater from villages and towns are effective approaches to the control of pollution in the river systems of the Taihu Upper-River Basin.
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Received: 07 December 2016
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