Guo Jun-Ming, Kang Shi-Chang, Zhang Qiang-Gong, Huang Jie, Wang Kang
Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue. 2012 Jul;33(7):2295-302.
In order to investigate the temporal and spatial variations, sources, and major controlling factors of the major ions in Nam Co Lake water, inshore surface water samples were collected at a fixed site (30 degrees 47.27'N, 90 degrees 58.53'E, 4718 m a. s. l.) from 2006 to 2010, at the vertical profiles in the center of the lake in August 2009, and at both the vertical profiles in the center of the lake and at the surface layers of different sites in the Nam Co Lake in October 2010. The results indicated that Na+ was the dominant cation and HCO3- was the dominant anion in the lake water. The concentrations of most ions were higher in monsoon seasons (June - September) and lower in non-monsoon seasons, especially when the lake was frozen (January -April). However, the Ca2+ concentration showed a reverse trend of seasonal variations, namely, higher values in the frozen period and lower in monsoon seasons. Analysis of water samples collected from the vertical profiles indicated that the concentrations of all ions except Ca2+ increased with the depth in nonmonsoon seasons (e. g. October). The major ions in Nam Co Lake were mainly contributed by river input. There were a variety of factors that influenced the temporal and spatial variations of the major ions in the Nam Co Lake, such as evaporation, precipitation, pH values, etc., among which, evaporation was the most important controlling factor, causing the increasing Na+ concentration and decreasing Ca2+ concentration in the lake water.
为了研究纳木错湖水主要离子的时空变化、来源及主要控制因素，于2006年至2010年在固定站点（北纬30°47.27′，东经90°58.53′，海拔4718米）采集近岸地表水样本，于2009年8月在湖心垂直剖面采集样本，并于2010年10月在湖心垂直剖面及纳木错湖不同站点表层采集样本。结果表明，湖水中Na+为主要阳离子，HCO3-为主要阴离子。多数离子浓度在季风季节（6 - 9月）较高，在非季风季节较低，尤其是湖泊结冰时（1 - 4月）。然而，Ca2+浓度呈现相反的季节变化趋势，即结冰期较高，季风季节较低。对垂直剖面采集的水样分析表明，在非季风季节（如10月），除Ca2+外所有离子的浓度均随深度增加。纳木错湖的主要离子主要来源于河流输入。有多种因素影响纳木错湖主要离子的时空变化，如蒸发、降水、pH值等，其中蒸发是最重要的控制因素，导致湖水中Na+浓度升高、Ca2+浓度降低。
