Abstract:One year’s systematic monitoring on the water quality in a typical agricultural watershed in the Three Gorges reservoir areas-Wangjiagou small watershed, located in Fuling, Chongqing, hade been conducted, for understanding its water chemical charateristics as influenced by rock weathering process. The results showed that water quality could be classified as Cl- —Ca2+ type, and the contents of most ions varied with different sampling points, seasons and water bodies. Gibbs and triangular diagrams analyses revealed that the water compositions in the watershed were significantly impacted by rock weathering process. The anions in the water bodies mainly derived from the dissolution of evaporites and carbonate weathering, while the cation compositions were mainly under the control of the later process together with the weathering and erosion of silicate minerals to some extent. Further, principal component analyses suggested that the impacts of rock weathering on the water ion compositions in the studied watershed followed a sequence of carbonate> evaporates> silicate minerals, and the carbonate weathering process was subjected to H2CO3 rather than H2SO4. In addition, agricultural and domestic activities could also show some impacts on water characteristics.
李梦婕, 江韬, 何仁江, 木志坚, 李雪梅, 魏世强, 谢德体. 岩石风化对三峡库区农业小流域水化学特征的影响[J]. 中国环境科学, 2012, 32(8): 1495-1501.
LI Meng-Jie, JIANG Tao, HE Ren-Jiang, MU Zhi-Jian, LI Xue-Mei, WEI Shi-Qiang, XIE De-Ti. Impact of rock weathering on water chemical characteristic in a typical small agricultural watershed of Three Gorges reservoir areas. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(8): 1495-1501.