以嘉陵江流域及其梯级开发河段为研究对象, 通过在2008 年8 月(雨季) 及2009 年2 月(旱季) 进行密集采样, 分析测定了河水中溶解无机碳(dissolved inorganic carbon, DIC)含量及其同位素组成, 探讨了河水中DIC的来源及其季节与空间变化特征. 结果表明: 嘉陵江河水DIC 及其同位素13CDIC 组成的平均值, 雨季时为2 018 μmol/L 和−8.6‰, 旱季时为3 150 μmol/L 和−6.0‰, 二者均存在显著的季节变化; 嘉陵江水体13CDIC 的值旱季(枯水期) 高于雨季(丰水期), 与自然河流的季节变化特征相似, 而与水库、湖泊不同, 表明嘉陵江梯级水库群水体“湖沼学反应”并不明显.
The Jialing River and its cascade reservoirs were investigated. Wedensely collected water samples along the Jialing River in August 2008 (rain season) and February 2009 (dry season). We determine the contents and isotopic compositions of dissolved inorganic carbon (DIC), and discuss the sources and spatio-temporal variations of DIC. The results show that the average DIC and 13CDIC were 2 018 μmol/L and −8.6‰ in a rainy season, and 3 150 μmol/L and −6.0‰ in a dry season, showing obvious seasonal variations. The 13CDIC values in winter were heavier than in summer, similar to undammed rivers but different from lakes and reservoirs. This indicates that the hydro-geochemical characteristics of waters in the cascade reservoirs of Jialing River are similar to natural rivers
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