Composition, spatial distribution, and environmental significance of water ions in Pumayum Co catchment, southern Tibet

作     者：ZHU Liping JU Jianting WANG Yong XIE Manping WANG Junbo PENG Ping ZHEN Xiaolin LIN Xiao ZHU Liping;JU Jianting;WANG Yong;XIE Manping;WANG Junbo;PENG Ping;ZHEN Xiaolin;LIN Xiao

作者机构：Institute of Tibetan Plateau Research CAS Beijing 100085 China Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Journal of Geographical Sciences》 (地理学报（英文版）)

年 卷 期：2010年第20卷第1期

页      面：109-120页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 09[农学] 0903[农学-农业资源与环境] 

基　　金：Foundation: National Natural Science Foundation of China, No.40871099 National Basic Research Program of China, No.2005CB422002 Knowledge Innovation Project of CAS, No. KZCX2-YW-146-4 Acknowledgment The authors are grateful to Dr. Feng Jinliang and Dr. Zhang Qianggong from Institute of Tibetan Plateau Research, Chinese Academy of Sciences (ITPCAS), for their helpful discussion during this study, to Ms. Gao Jing from ITPCAS for supplying oxygen isotope data, to Dr. Huang Qiumei from Academy of Mathematics and Systems Science, Chinese Academy of Sciences, for her hard work at English improvement 

主　　题：Lake Pumayum Co hydrochemistry spatial distribution sedimentary process carbonate 

摘      要：The chemistry of major cations （Mg^2＋, Ca^2＋, Na^＋, and K^＋） and anions （HCO3^-, SO4^2-, and CI^-） in the water of Lake Pumayum Co and its inflow river was studied, revealing the obvious ionic difference among various inflow rivers and the lake. The chemical type of the lake water was Mg^2＋-Ca^2＋-HCO3^- -SO^2＋, but the major ions of the main inflow rivers were Ca^2＋-Mg^2＋-HCO3^-. In the lake inlet of Jiaqu River, the main inflow river, there was significant variance of water chemistry within the depth less than 2 m. However, it was almost homogeneous at other area of the lake. Therefore, with the evidence of distribution of water chemistry and oxygen isotope of lake water, a conclusion can be outlined that Jiaqu River had a distinct effect on the hydrochemistry of the water on the submerged delta, whereas this is not the case for other rivers. The Gibbs plot revealed that the dominant mechanism responsible for controlling chemical compositions of the lake water was rocks weathering in the drainage area. Ion ratios and ternary plots further explored the main processes controlling the water chemistry of the catchment, i.e., carbonate weathering, pyrite weathering, and silicate weathering. The different hydrochemistry characteristics between river water and lake water may result from the CaCO3 precipitation. The findings will benefit the explanation of the environmental significance of carbonate in paleolimnological studies in the lake.