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| Impact of Land Use on Water Quality Along Inflow Rivers in Taihu Basin |
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| KeyWord:Taihu basin; land use; water quality; buffer zone |
| Author Name | Affiliation | | YU Meng-qiu | School of Life Sciences, Nanjing University, Nanjing 210093, China | | CAI Ying | School of Life Sciences, Nanjing University, Nanjing 210093, China | | LIU Hua | School of Life Sciences, Nanjing University, Nanjing 210093, China | | GONG Lei-ting | School of Life Sciences, Nanjing University, Nanjing 210093, China | | LENG Xin | School of Life Sciences, Nanjing University, Nanjing 210093, China | | AN Shu-qing | School of Life Sciences, Nanjing University, Nanjing 210093, China |
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| Abstract: |
| Relationship between land use and water quality along typical inflow rivers in the Taihu Basin were explored at semi-circle buffer zones（100 m, 200 m, 500 m, 1000 m, 1500 m and 2000 m）. Water samples were collected and analyzed for physico-chemical variables from late May to early June in both 2009 and 2010. Land use and land cover（LULC） data was also obtained in 2009. Statistical analysis including cluster analysis, correlation analysis and stepwise regression analysis were used to identify the major sources of pollutants and to determine the critical range of anthropogenic disturbance in the inflow rivers. The water quality in the inflow rivers was affected primarily by paddy field, residential, and construction land. Total N in water was positively correlated with paddy field and construction land, and NH3-N with paddy field, rural residential and construction land. Total P and PO4-P were significantly influenced by paddy field and urban residential. The critical range where water quality was severely impacted was 500~1000 m. Nitrogen and phosphorus in water were influenced most by human activities in the 500~1000 m buffer zone, while water TOC was mainly affected in the buffer zone of 500 m. The impacts of land use on water quality were reduced beyond the critical range, and even became non-significant. |
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