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| Effects of land use changes on water quality of the plain area in Taihu Basin |
| Received:November 28, 2016 |
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| KeyWord:river water quality;land use;buffer zone;wet season;dry season;Grey Relational Analysis |
| Author Name | Affiliation | E-mail | | GAO Bin | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China | | | XU You-peng | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China | xuyp305@163.com | | WANG Qiang | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China | | | YANG Jie | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China | | | SHEN Shun-zhong | Wuxi Branch of Hydrology and Water Resources Survey Bureau of Jiangsu Province, Wuxi 214031, China | | | XU Xing | Wuxi Branch of Hydrology and Water Resources Survey Bureau of Jiangsu Province, Wuxi 214031, China | |
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| Abstract: |
| The water environment in Taihu Lake Plain has been getting worse in recent years. To improve the situation of this water environment, the effects of different land use and land cover(LULC) on water quality should be studied. Taihu Lake Plain was chosen as the study area because of its representativeness. Based on surface water quality monitoring data in a typical year and land use and land cover(LULC), the grey relational order between LULC and surface water quality was calculated through Grey Relational Analysis(GRA). The similarities between curves drew from the data of LULC and water quality indices were compared to determine the grey relational order. Circle buffer zones(200, 500, 1000, 1500, 2000 m) of sites and divided areas were set as samples to calculate the grey relational order which can reflect effects of LULC on surface water quality. The grey relational order between surface water quality and LULC was urban land> dry land or paddy field> forestland> water area. The grey relational orders of water quality indices were different between the dry season and the wet season. Surface water quality was affected by urban land most and by water area least when buffers of water quality monitoring sites were set as examples. This research provides references for land use change and water quality protection. Data with more details should be collected in a further study. A mechanism model is needed to explain how LULC affects surface water quality. |
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