Hydrochemical characteristics, main ion sources of main rivers in the source region of Yangtze River
LIU Min1,2, ZHAO Liang-yuan1,2, LI Qing-yun1,2, ZOU Jing-yi1,2, HU Yuan1,2, ZHANG Yi-zhe4, XU Ping3, WU Zhi-guang3, DENG Wei1,2, TAO Jing-xiang1,2
1. Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; 2. Hubei Provincial Key Laboratory of River Basin Water Resources and Environmental Sciences, Changjiang River Scientific Research Institute, Wuhan 430010, China; 3. Changjiang River Scientific Research Institute, Wuhan 430010, China; 4. Hanjiang River Hydrology and Water Resources Survey Bureau, Hydrology Bureau of the Yangtze River Water Conservancy Committee, Xiang Yang, 441022, Hubei, China
Abstract：Based on the field investigation of water environment and historical monitoring data in SRYR, the present research analyzed the distribution characteristics of main ions in the main rivers of the SRYR, revealed the hydrochemical types and main controlling factors of the main rivers, clarified the main ion sources and evaluated the applicability of the main rivers. The results indicated that the average concentration of the main cations in the river water of the SRYR displayed in the order of Na+ > Ca2+ > Mg2+ > K+, of which the average concentration of Na+ and Ca2+ accounted for 65.9% and 18.8% of the total cations, respectively. The average content of major anions was in the order of Cl-> HCO3-> SO42-> NO3-, in which the average content of Cl- and HCO3- accounted for 47.6% and 32.9% of the total anions, respectively. The hydrochemical types of the main rivers in the SRYR were Na-Cl, Ca-HCO3 and Ca-SO4, which was mainly controlled by evaporative crystallization and rock weathering, the main ion come from the rock weathering. However, there were certain differences in the water chemistry characteristics in different rivers. Hydrochemical type of Dangqu was mainly Ca-HCO3 and Ca-SO4, which was mainly controlled by rock weathering. Hydrochemical types of Na-Cl were showed in Tuotuo river and Chumar river, which were mainly controlled by evaporative crystallization, and the main ions come from the dissolution of evaporative rocks. The hydrochemical types of Tongtian river were Na-Cl and Ca-HCO3, which were mainly controlled by weathering and evaporative crystallization of rocks, and the main ions come from the dissolution of evaporated rocks, carbonates and silicates. The hardness of the river water in the SRYR was relatively high, while the water quality of the Dangqu river was suitable for irrigation, the water quality of the Tuotuo River, Chumar River and Tongtian River were recommended to be used for irrigation with caution and not suitable for direct drinking.The results were expected to provide basic data support for the protection and utilization of water resources in the SRYR.
刘敏, 赵良元, 李青云, 邹靖怡, 胡园, 张屹哲, 徐平, 吴志广, 邓玮, 陶晶祥. 长江源区主要河流水化学特征、主要离子来源[J]. 中国环境科学, 2021, 41(3): 1243-1254.
LIU Min, ZHAO Liang-yuan, LI Qing-yun, ZOU Jing-yi, HU Yuan, ZHANG Yi-zhe, XU Ping, WU Zhi-guang, DENG Wei, TAO Jing-xiang. Hydrochemical characteristics, main ion sources of main rivers in the source region of Yangtze River. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1243-1254.
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