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Water chemistry characteristics of a typical agricultural small watershed in Three Gorge Reservoir area and its changing tendency |
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Abstract Through systematically monitoring the ion compositions of the water bodies, a case study has been conducted in a typical agricultural small watershed-Wang Jiagou Small Watershed, which is located in Three Gorges Reservoir areas, Chongqing, for understanding the characteristics of its water chemistry and the changing tendency, The results showed that Ca2+ and Cl- were predominant cation and anion respectively, waters in the watershed were of fresh water, and the water quality belonged to Cl--Ca2+ type classified as ClCaⅢ type. Meanwhile, it¢s also found that TZ+ was 6.30meq/L, which highly exceeded the world average level, and TZ- was accordingly 6.29meq/L. Additionally, the average TDS was 294.78mg/L, indicating the existence of significant chemical erosion process. Furthermore, for most ions among different sampling points, the significant variations of ions contents were also observed due to seasons and water types.
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Received: 09 October 2011
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