• 关键词：离子组成  水化学类型  岩石风化  叶如藏布  喜马拉雅山

• 基金项目：国家自然科学基金（No.41261016,41561016）；中国科学院冰冻圈科学国家重点实验室开放基金项目（No.SKLCS-OP-2016-10）；西北师范大学青年教师科研能力提升计划项目（No.NWNU-LKQN-14-4）

• 安丽娜
• 西北师范大学地理与环境科学学院, 兰州 730070

• 姚晓军
• 西北师范大学地理与环境科学学院, 兰州 730070

• 杨东
• 西北师范大学地理与环境科学学院, 兰州 730070

• 孙美平
• 1 西北师范大学地理与环境科学学院, 兰州 730070;2 中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室, 兰州 730000

• 祁苗苗
• 西北师范大学地理与环境科学学院, 兰州 730070

• 宫鹏
• 西北师范大学地理与环境科学学院, 兰州 730070

• 李晓锋
• 西北师范大学地理与环境科学学院, 兰州 730070

• 高永鹏
• 西北师范大学地理与环境科学学院, 兰州 730070

• 摘要：为调查喜马拉雅山中段北坡地表水环境特征,2015年9月在叶如藏布流域采集24个地表水体水样并对其水化学特征分析测定,研究结果表明：①叶如藏布流域水化学特征存在显著空间差异.随着海拔升高,地表水体pH值、TDS值呈微弱的减小趋势.24个水样中23个水样属于淡水,1个为微咸水.②叶如藏布流域内地表水阳离子主要为Ca²⁺,阴离子以SO₄^2-为主,其次为HCO₃^-,即地表水为Ca²⁺-SO₄^2-型.③叶如藏布流域地表水中各离子之间具有不同程度的相关性.其中Cl^-、HCO₃^-、Na⁺和K⁺ 4种离子共源性好；阳离子的来源不同,Na⁺和K⁺主要来源于碳酸氢盐,Ca²⁺主要来源于硫酸盐,而Mg²⁺的来源比较广泛.④叶如藏布流域大部分离子主要来源于陆地,受陆源影响从小到大排列顺序为：Na⁺ < Mg²⁺ < SO₄^2- < Ca²⁺ < K⁺ < HCO₃^-.流域水文化学过程主要受岩石风化作用控制,特别是受到碳酸盐风化影响.以强木村为界,流域下游地区地表水化学特征受人类活动影响逐渐变大,特别是畜牧活动及人类施肥的影响.

• Abstract：The chemical characteristics of surface water can reflect the climate and environmental background of the region. In order to investigate the hydrochemical characteristics in the northern slope of the middle Himalayas, 24 water samples of glacial lake, river, wetland and precipitation were collected in the Yairu Zangbo Basin in September 2015, and were then analyzed. The results show that the hydrochemical characteristics exhibited a significant spatial diversity in the Yairu Zangbo Basin. The pH and TDS values of water samples present a weak decrease trend as elevation rises. All the samples belonged to fresh water except one identified as brackish water. The predominant cation of surface water was Ca²⁺ and the main anion was SO₄^2-, followed by HCO₃^-. This means that the water was characterized by Ca²⁺-SO₄^2- in the Yairu Zangbo Basin. There were different correlations among all the ions. In particular, four ions including Cl^-, HCO₃^-, Na⁺ and K⁺ had a strong co-originality. However, cations originated from different sources. For instance, Na⁺ and K⁺ mainly came from bicarbonate, Ca²⁺ was mainly from sulfate, and the source of Mg²⁺ was wide. Meanwhile, it was revealed that the main ions are mainly originated from terrestrialdust using the sea-salt ions tracer method in the Yairu Zangbo Basin. According to the influence of terrestrial dust, the order of ions was: Na⁺ < Mg²⁺ < SO₄^2- < Ca²⁺ < K⁺< HCO₃^-. This implied that the hydrochemical process was mainly controlled by rock weathering in this basin, especially the natural weathering of carbonate rock. The human activities such as herding and fertilization had a growing impact on hydrochemical characteristics of river and wetland at the downstream area below the Qiangmu Village.

• Key words：ion composition  hydrochemicalcharacteristics  rock weathering  YairuZangbo  the Himalayas

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