| 祁连山七一冰川融水化学组成及演化特征 |
| 摘要点击 4464 全文点击 2400 投稿时间：2007-04-30 修订日期：2007-07-23 |
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| 中文关键词 水化学 冰川融水 七一冰川 祁连山 |
| 英文关键词 hydrochemistry melt-water Qiyi glacier Qilian Mts. |
| DOI 10.13227/j.hjkx.20080312 |
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| 中文摘要 |
| 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32.4～134.4 μS·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HCO-3-Ca2+型演化为(HCO-3+SO2-4)-(Ca2++Mg2+)型.几乎所有样品中主要可溶阴、阳离子浓度序列为：HCO-3>SO2-4>Cl->NO-3，Ca2+>Mg2+>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Mg2+和K+浓度增加速率大于Ca2+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. |
| 英文摘要 |
| 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-3-Ca2+ to （HCO-3+SO2-4）-（Ca2++Mg2+）. Major ions,almost in all samples:HCO-3>SO2-4>Cl->NO-3，Ca2+>Mg2+>Na+>K+ mainly comes from carbonate weathering,and some is from sulfate dissolution. Concentrations of Mg2+and K+ increase quicker than Na+ and Ca2+ 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. |
