JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (05): 107-112.doi: 10.3969/j.issn.1000-2006.201706042

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Effects of dams and landscape on river water quality: a case study in Suo River

NIU Yuchen1, KONG Jin2, WANG Wei1, XI Wenjuan1, RUI Zhengqin1, LIU Maosong1*   

  1. 1. School of Life Sciences, Nanjing University, Nanjing 210023, China; 2. School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China
  • Online:2018-09-15 Published:2018-09-15

Abstract: 【Objective】 Study the effects of dams on water quality, and the relationship between water quality and land use. 【Method】 The Suo River, one of the fourth tributaries of Huai River, was selected as the study area. Water quality data were obtained from rivers and reservoirs divided by three dams located in rural, urban and suburb. The difference of water quality between rivers and reservoirs in different regions was evaluated. 【Result】The comparison of water quality in rivers and reservoirs showed that the concentration of total phosphorus(TP)in rivers was higher than those in reservoirs, while the concentration of NH+4-N and the chemical oxygen demand(COD)in rivers was lower than in reservoirs. There is no significant difference of total nitrogen(TN)and NO-3-N between rivers and reservoirs. Redundancy analysis showed that the construction land area exhibited a positive correlation with the concentration of TN, TP, NO-3-N and COD, while forest area exhibited a negative correlation with the concentration of TN, TP, NO-3-N and COD. Farmland area exhibited a negative correlation with the concentration of TN, TP and NO-3-N in rivers, and was positively correlated with the concentration of TN, TP and NO-3-N in reservoirs.【Conclusion】Dam divided river into two parts: the river and the reservoir. After dam construction, the content of TP was reduced, but the content of NH+4-N and COD were increased. Land use had different relationships with water quality indexes between rivers and reservoirs, the water quality indexes in reservoirs were more affected by land use.

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