Acta Geographica Sinica ›› 2011, Vol. 66 ›› Issue (5): 662-672.doi: 10.11821/xb201105009

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Water Chemistry of the Lakes and Groundwater in the Badain Jaran Desert

SHAO Tianjie1, ZHAO Jingbo1,2, DONG Zhibo1,3   

  1. 1. College of Tourism and Environment Science, Shaanxi Normal University, Xi'an 710062, China;
    2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an 710075, China;
    3. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China
  • Received:2010-11-07 Revised:2011-03-20 Online:2011-05-20 Published:2011-05-20
  • Supported by:

    Yangtze River Scholar Bonus Schemes of China, No.801813

Abstract: Based on the analysis of ion chemical composition of lake water and shallow groundwater in the Badan Jaran Desert, this paper discussed the characteristics of chemical composition, type of the lake water, spatial variation of lake water, and possible supply sources of lake water and groundwater in the desert areas. The results show that the pH, salinity, TDS and electrical conductivity of the lakes are greater than those of groundwater. The ion contents of the water samples are dominated by Na+ and Cl-. Most of the higher salinity lakes are Na(K)-Cl-(SO4) type, and a few low-salinity lakes are Na-(Mg)-(Ca)-Cl-(SO4)-(HCO3) type. Most of the groundwater bodies are Na-(Ca)-(Mg)-Cl-(SO4)-(HCO3) type, attribute brackish lake, and only a few present a Na-Cl-SO4 type, flowing under salt water lake. The pH, salinity, TDS and electrical conductivity of the southeastern lakes are relatively low, and there are slightly alkaline lakes, while the pH value, salinity, TDS and electrical conductivity of water in the northern lakes are much greater than those of the southeastern lakes, so the northern lakes are mederately alkaline and salt water ones. In the southeastern part of the Badan Jaran Desert, the chemical characteristics of ions of the lakes water show a changing trend from south to north in the order of brackish lake→salt water lake→Salina. The changing trends of chemical compositions of ions in recent 9 years indicate that most of the ion contents have a shade of reduced in Boritaolegai, east Badain, west Badain, Nuoertu and Huhejilin Lake, which states clearly that the amount of fresh water is increasing in the 9-year period. The chemical compositions of the lake water reveal that the flow direction of lake water is from the southeast to northwest in the Badan Jaran Desert.

Key words: chemical composition of water, desert lakes, chemistry type of lake water, spatial variation of lake water, groundwater, supply sources, Badain Jaran Desert