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冰川冻土 ›› 2017, Vol. 39 ›› Issue (2): 407-415.doi: 10.7522/j.issn.1000-0240.2017.0046

• 寒旱区水文与水资源 • 上一篇    下一篇

祁连山中段排露沟流域水化学特征及成因

冯芳1, 冯起2,3, 刘贤德3, 刘蔚2, 金爽2   

  1. 1. 江苏师范大学 地理测绘与城乡规划学院, 江苏 徐州 221116;
    2. 中国科学院 寒区旱区环境与工程研究所 阿拉善荒漠生态-水文试验研究站, 甘肃 兰州 730000;
    3. 甘肃省祁连山水源涵养林研究院, 甘肃 张掖 734000
  • 收稿日期:2016-12-19 修回日期:2017-02-15 出版日期:2017-04-25 发布日期:2017-07-08
  • 作者简介:冯芳(1984-),女,湖北荆州人,讲师,2012年在中国科学院寒区旱区环境与工程研究所获博士学位,从事高寒山区水化学和环境化学研究.E-mail:fengfangjs2006@163.com
  • 基金资助:
    国家自然科学基金青年基金项目(41501085;41601029);中国博士后科学基金项目(2013M532094);湖北省自然科学基金青年项目(2016CFB219)资助

Hydrochemical characteristics and controlling factors at Pailugou catchment in the central Qilian Mountains

FENG Fang1, FENG Qi2,3, LIU Xiande3, LIU Wei2, JIN Shuang2   

  1. 1. School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China;
    2. Alashan Desert Eco-Hydrology Experimental Research Station, Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy Sciences, Lanzhou 730000, China;
    3. Institute of Water Resources Conservation Forests in the Qilian Mountains, Zhangye 734000, Gansu, China
  • Received:2016-12-19 Revised:2017-02-15 Online:2017-04-25 Published:2017-07-08

摘要: 2012年11月-2013年10月,在祁连山中段排露沟流域持续采集1 a的大气降水和出口断面径流样品,对主要可溶离子、pH、电导率EC和总溶解固体TDS进行了分析。结果表明:流域径流与大气降水相比,各项对应离子浓度显著增加,径流TDS均值(255.50 mg·L-1)远大于降水(46.77 mg·L-1)。径流离子类型为Ca2+-Mg2+-HCO3-,呈弱碱性。大气降水离子类型为Ca2+-HCO3-,接近中性。所有径流样品都落在Gibbs分布图的左中端,表明径流离子组成主要受流域岩石风化作用控制。根据Piper图和主要离子的摩尔比值,综合分析得出控制径流离子过程主要是流域碳酸盐岩风化,其次伴随部分硫酸盐和硅酸盐岩石风化。并通过海盐校正分析方法,得出大气降水对出口断面径流主要离子贡献率仅为4.58%。

关键词: 祁连山, 排露沟流域, 离子浓度, 水化学特征, 岩石风化

Abstract: The aim of this study was to investigate the hydrochemical characteristics and controlling factors of Pailugou catchment in the Central Qilian Mountains. One-year continuous precipitation and runoff samples were analyzed for major cations (Mg2+, Ca2+, Na+, and K+) and anions (SO42-, NO3-, Cl- and HCO3-), pH, electrical conductivity (EC) and total dissolved solids (TDS). The results revealed that Ca2+ and Mg2+ were the dominant cations, and HCO3- was the dominant anion in runoff. While the anions and cations in precipitation were dominated by Ca2+ and HCO3-, respectively. The wide water-rock interaction and chemical denudation of mineral solutes resulted in higher solute concentration in stream. The average TDS of runoff was 255.50 mg·L-1, which was much higher than that of precipitation (46.77 mg·L-1). The average pH value in runoff was alkaline, while in precipitation was close to neutral. All of the runoff samples fall within the mid-left side of Gibbs distribution graph, indicating that the major origin of ions in runoff was the weathering of rocks. Based on the piper trilinear nomograph and the major ion molar concentration ratios, this paper further explored that the main processes controlling the water chemistry were mainly by chemical weathering of carbonate rock, partially by sulfate weathering and silicate weathering in rocks. Based on seawater correction approach, the contribution proportion of local precipitation to the solute of runoff at the Pailugou catchment was 4.58%.

Key words: Qilian Mountains, Pailugou catchment, ionic concentration, water chemistry, rock weathering

中图分类号: 

  • P342