Journal of Geographical Sciences ›› 2017, Vol. 27 ›› Issue (9): 1111-1122.doi: 10.1007/s11442-017-1425-1

• Research Articles • Previous Articles     Next Articles

Hydrochemical regime and its mechanism in Yamzhog Yumco Basin, South Tibet

Meng ZHE1,2(), Xueqin Zhang1,*(), Buwei WANG1,2, Rui SUN3, Du ZHENG1   

  1. 1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Rubber Research Institute, Chinese Academy of Tropical Agriculture Sciences, Danzhou 571737, Hainan, China
  • Received:2016-07-14 Accepted:2017-02-24 Online:2017-09-10 Published:2017-09-05
  • Contact: Xueqin Zhang E-mail:aimierzhe@126.com;zhangxq@igsnrr.ac.cn
  • About author:

    Author: Zhe Meng (1989-), PhD Candidate, specialized in hydrological process of alpine lakes. E-mail:aimierzhe@126.com

  • Supported by:
    National Natural Science Foundation of China, No.41471064, No.41171062

Abstract:

The hydrochemistry of alpine lakes reflects water characteristic and its response to climatic change. Over 300 water samples had been collected from 52 sites of 5 lakes and 7 inflowing rivers in the Yamzhog Yumco Basin, South Tibet, during 2009-2014, basing which the hydrochemical regime and its mechanism were analyzed along with the adoption of hydrological investigations in 1979 and 1984 as well. Results revealed that the waters were hard with weak alkalinity for the Yamzhog Yumco Basin. Most of them were fresh, and the rest were slightly saline. The hydrochemical types of 5 lakes (i.e., Lake Yamzhog Yum Co, Puma Yum Co, Bajiu Co, Kongmu Co, and Chen Co) were SO42--HCO3--Mg2+-Na+, HCO3-- SO42--Mg2+-Ca2+, SO42--Mg2+-Na+, SO42--HCO3--Ca2+, and SO42--Na+-Mg2+-Ca2+, respectively. As for rivers, HCO3- and SO42- were the major anions, and Ca2+ was the dominant cation. Lake Yamzhog Yum Co, the largest lake in the basin, exhibited remarkable spatial variations in hydrochemistry at its surface but irregular changes with depth. The weathering of evaporates and carbonates, together with evaporation and crystallization, were the major mechanisms controlling the hydrochemistry of waters in the Yamzhog Yumco Basin. Global warming also had significant impacts on hydrochemical variations.

Key words: hydrochemical regime, control mechanism, Piper diagram, Gibbs model, Yamzhog Yumco Basin, alpine lake