RESUMEN
The characteristics of ion concentration were studied in snowpit samples collected from the GRHK glacier, the XDKMD glacier and the YZF glacier over the Tibetan Plateau. Samples of snowpits in these three glaciers were analyzed by ion chromatography and ion sources were also explored by correlation analysis. The results indicated that the concentration of Ca2+, Mg2+, Na+, Cl- and SO4(2-) increased from the GRHK glacier to the XDKMD glacier and to the YZF glacier, suggesting that the terrestrial matter were major origin from the south to north over the Tibetan Plateau. The concentration of Cl-, Na+ and SO4(2-) in YZF glacier was higher by many times than GRHK glacier and XDKMD glacier, Perhaps mainly come from the evaporation of salt lake and the weather of mineral salts in the Qaidam Basin. The sources of NO3-, K+ and NH4+; were complicated and it is not obvious for the indication of environment.
Asunto(s)
Monitoreo del Ambiente/métodos , Cubierta de Hielo/química , Iones/análisis , Nieve/química , Altitud , Suelo/análisis , TibetRESUMEN
Abundance and species diversity of bacteria were investigated respectively by epifluorescence microscope, the culture method and the analysis of 16S rDNA genes, with snow and runoff samples from Qiyi Glacier in the Qilian Mts. According to the results, the total microbial cells and bacterial CFU range from 10(3) to 10(5) cells x mL(-1) and 0-600 cfu x mL(-1), respectively. The 16S rDNA gene of 22 bacterial isolates recovered from snow and runoff samples belong to following groups: Bacteroidetes, Actinobacteria, Firmicutes and alpha, beta, gamma-Proteobacteria. Based on their 16S rRNA sequences, Bacteroidetes forms the largest cluster in terms of abundance (80% of all isolates) and Pedobacter and Pseudomonas form the dominant genera in terms of abundance (90% of all isolates). Compared with bacteria revealed from ice and snow in Qinghai-Tibet Plateau, South Pole and North Pole which have been reported, the bacteria belonging to Pantoea, Providencia, Terrabacter, Aerococcus and Oxalobacteraceae are especially exist in Qiyi Glacier as far as we know.
Asunto(s)
Bacteroidetes/aislamiento & purificación , Biodiversidad , Cubierta de Hielo/microbiología , Pseudomonas/aislamiento & purificación , Microbiología del Agua , Bacterias/clasificación , ChinaRESUMEN
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 microS 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(-) + SO4(2-))-(Ca(2+) + Mg(2+)). Major ions,almost in all samples; HCO3(-) > SO4(2-) > 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.