摘要
2006年6-10月对青藏高原纳木错流域你亚曲、曲嘎切、昂曲3条河流进行了连续采样,同时在2005年9月和2006年9月2次环纳木错考察中采集了其他河水的样品.河水中主要阴离子(Ca^2+、Mg^2+、Na^+、K^+)和阳离子(Cl^-、NO3^-、HCO3^-、SO4^2-)的分析结果表明,你亚曲、曲嘎切和昂曲的离子总量(TDS)分别为79.48、23.44和111 mg/L.离子总量明显低于青藏高原及我国其他河流,且相互之间存在较为明显的差距.3条河流中,曲嘎切为重碳酸盐钙型水,昂曲介于重碳酸盐钠型和重碳酸盐钙型之间,你亚曲的化学类型介于两者之间.河流水化学的时间变化显著,而且与流量成一定的反相关关系.利用主成分分析和相关分析得出:你亚曲河水主要化学成分来源于碳酸盐中的Ca2+和HCO3-;曲嘎切来源于冰川融水以及碳酸盐中的Ca^2+、HCO^3-和Na^+;昂曲则来源于蒸发岩中的Na^+、Mg^2+和Cl^-.
A preliminary study of major ions in water of three rivers (Niyaqu, Qugaqie, Angqu) in the Nam Co Basin has been carried out in June-October 2006. An obvious difference is found among these rivers, whose ionic characteristics are mainly influenced by the length of rivers and their supply sources. Among the three rivers, the contents of total dissolve solids (TDS) is 79.48 mg/L, 23.44 mg/L, and 111 mg/L in the Niyaqu, Qugaqie, and Angqu, respectively. The hydro-chemical type is C^Ca for the Qugaqie, between C^Na and Cca for the Angqu, and between the Angqu and Qugaqie for the Qugaqie. Changes in ionic concentrations are also related with discharges of the rivers. According to principal component analysis and correlation analysis, the main chemical contents derive from Ca^2+ and HCO3^- in carbonate for the Niyaqu, glacier meltwater and carbonate for the Qugaqie, and Na^+ , Mg^2+ and Cl^- in evaporates for the Angqu.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2008年第11期3009-3016,共8页
Environmental Science
基金
国家重点基础研究发展规划(973)项目(2005CB422004)
中国科学院“百人计划”项目
科技部基础性工作专项项目(2006FY110200)
欧盟第六框架项目(FP6-036952)