Hydrochemical characteristics and controlling factors of shallow groundwater in the Chinese Loess Plateau
LIU Xin1,2, XIANG Wei3, MA Xiao-jun1, FAN Yan-li1, SI Bing-cheng1,4
1. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling 712100, China; 2. Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China; 3. Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Northwest University, Xi'an 710127, China; 4. Department of Soil Science, University of Saskatoon, SK S7N5A8, Canada
Abstract:The 57 shallow groundwater samples along the Yellow River in the middle of Chinese Loess Plateau were collected, and the qualitative (Gibbs, Na-normalized molar ratios and ions correlation methods) and quantitative methods (forward derivation modeling) were used to explore the hydrochemical characteristics, the variation rules along the channels, and the controlling factors. The results showed that the shallow groundwater samples were weakly alkaline; the dominant anion and cation was HCO3- and Na+, respectively; the major groundwater type was HCO3-Ca-Mg (accounted for 40%). There was a difference of variation trend of major ions of shallow groundwater from north to south in the research areas. The Cl- level kept dynamic stability along the way, SO42-, HCO3-, Mg2+, and Na+ increased, while NO3-, Ca2+, and K+ decreased. Mineral exploitation was an important source of SO42-, while the Na+ enrichment was caused by strong cation exchange. Moreover, the source of groundwater solutes was mainly controlled by rock weathering, primarily silicate weathering. The relative contribution of groundwater solutes by atmospheric input, human activity, and rock weathering was 5% ±3%, 6% ±13%, and 89% ±13%, respectively. Furthermore, the change of underlying surface conditions, human activities, and climate change directly or indirectly affected the groundwater quantity and quality by changing the processes of groundwater recharge and discharge. Our findings will inform current and future groundwater quality management programs for the Yellow River catchment and other similar area.
刘鑫, 向伟, 马小军, 范艳丽, 司炳成. 黄土高原中部浅层地下水化学特征及影响因素[J]. 中国环境科学, 2021, 41(11): 5201-5209.
LIU Xin, XIANG Wei, MA Xiao-jun, FAN Yan-li, SI Bing-cheng. Hydrochemical characteristics and controlling factors of shallow groundwater in the Chinese Loess Plateau. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5201-5209.
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