| 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. |
