摘要
2006-06-2006-07在祁连山七一冰川采集冰川冰、冰面融水、侧碛河及冰川融水径流样,分析了样品中主要可溶离子浓度、pH及电导率.结果表明,所有样品的pH介于8.05-8.79之间,电导率分布在32.4-134.4μS·cm^-1之间.不同水体中主要可溶离子浓度顺序为：冰面融水〈侧碛河〈七一冰川水文总汇点,水化学类型也由HCO3^--Ca^2＋型演化为（HCO3^-＋SO4^2-）-（Ca^2＋＋Mg^2＋）型.几乎所有样品中主要可溶阴、阳离子浓度序列为：HCO3^-〉SO4^2-〉Cl^-〉NO3^-,Ca^2＋〉Mg^2＋〉Na^＋〉K^＋,以碳酸盐风化产物为主,也有部分硫酸盐贡献.由于受到各种物理化学因素影响,在水岩作用过程中Mg^2＋和K^＋浓度增加速率大于Ca^2＋和Na^＋,不同于其在地壳中的丰度.七一冰川区融水中离子浓度空间变化主要受水岩作用时间控制,气温影响下的冰川消融量的大小是水化学时间变化的主要控制因素.
Glacier ice, supraglacier stream water, ice-marginal stream water, proglacier stream water samples were collected at Qiyi glacier located in central part of Qilian Mountain 2006-06 - 2006-07. Major ions concentration, pH and EC were analyzed. The results indicate that pH varies from 8.05 to 8.79, and EC 32.4 - 134.4 μS· cm^-1 . The order of major ions concentration in differed water is： supraglacier stream water 〈 ice-marginal stream water 〈 proglacier stream water. Meanwhile, hydrochemical characteristics vary from HCO3^- -Ca^2＋ to （HCO3^- ＋ SO2^- ）-（Ca^2＋ ＋ Mg^2＋ ）. Major ions,almost in all samples：HCO3^- 〉 SO2^- 〉 Cl^- 〉 NO3^- ,Ca^2＋ 〉 Mg^2＋ 〉 Na^＋ 〉 K^＋ mainly comes from carbonate weathering, and some is from sulfate dissolution. Concentrations of Mg^2 ＋ and K^＋ increase quicker than Na^＋ and Ca^2＋ in proglacier stream and ice-margin stream that is inverse to their abundance in crust. The spatial characteristic of ions concentration is controlled by the process of water-rock and temporal change is hydrological factors.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2008年第3期613-618,共6页
Environmental Science
基金
中国科学院创新团队国际合作伙伴计划项目(CXTD-Z2005-2)
国家重点基础研究发展规划(973)项目(2005CB422003)
国家杰出青年科学基金项目(40525001)
中国科学院优秀人才项目(2005406)
关键词
水化学
冰川融水
七一冰川
祁连山
hydrochemistry
melt-water
Qiyi glacier
Qilian Mts.
