Liu Xin, Xiang Wei, Si Bing-Cheng
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling 712100, China.
Department of Soil Science, University of Saskatoon, SK S7N 5A8, Canada.
Huan Jing Ke Xue. 2021 Jun 8;42(6):2817-2825. doi: 10.13227/j.hjkx.202011068.
The Weihe and Jinghe Rivers catchments are important tributaries of the Yellow River, where it is of great significance to evaluate groundwater hydrochemistry and quality for ecological protection and sustainable development. Piper diagrams, Gibbs, Na-normalized molar ratios, and ion correlation methods were used to analyze the chemical composition of groundwater in these two catchments. Furthermore, the WQI method, Wilcox diagrams, USSL diagrams, and Doneen diagrams were used to evaluate the suitability of groundwater quality for drinking and irrigation. The results showed that the Weihe and Jinghe River catchments are dominated by fresh and weakly alkaline water. Groundwater ion concentration in the Weihe River are higher than in Jinghe River except for Na, and the major groundwater types are HCO-Ca-Mg(accounted for 50%), and HCO-Ca-Mg and HCO-Na-K (accounted for 32.5%), respectively. The hydrochemistry of the Weihe and Jinghe River catchments is mainly controlled by rock weathering, primarily silicate weathering. Moreover, the groundwater chemistry in the research area is affected by mining and chemical fertilizer application for agriculture. Furthermore, the hydrochemistry of the Weihe River catchment is affected by cation exchange, although this was not obvious in some regions of the Jinghe River catchment. The overall groundwater quality of the two catchments was good, with the Jinghe River water quality being better than in the Weihe River catchment. Based on SSP, SAR, and PI, the groundwater in some parts of the study area cannot be directly used for irrigation as this would result in salinization and, thus, inhibit plant growth. Overall, the groundwater quality in the south of the study area is better than in the north, and is better in the Jinghe River catchment than in the Weihe River catchment according to these three indicators. This study provides a basis for the sustainable development of two catchments, providing baseline data for groundwater quality management.
渭河和泾河流域是黄河的重要支流，对其进行地下水水化学和水质评价对于生态保护和可持续发展具有重要意义。采用派珀图、吉布斯图、钠标准化摩尔比和离子相关性方法分析了这两个流域地下水的化学成分。此外，运用水质指数法、威尔科克斯图、美国盐度实验室图和多宁图来评价地下水水质对饮用和灌溉的适宜性。结果表明，渭河和泾河流域以淡水和弱碱性水为主。除钠外，渭河的地下水离子浓度高于泾河，主要地下水类型分别为HCO-Ca-Mg（占50%）以及HCO-Ca-Mg和HCO-Na-K（占32.5%）。渭河和泾河流域的水化学主要受岩石风化控制，主要是硅酸盐风化。此外，研究区域的地下水化学受到采矿和农业化肥施用的影响。此外，渭河流域的水化学受阳离子交换影响，尽管在泾河流域的某些地区这种影响并不明显。两个流域的总体地下水水质良好，泾河水质优于渭河流域。基于钠吸附比、盐害率和渗透率，研究区域部分地区的地下水不能直接用于灌溉，因为这会导致土壤盐碱化，从而抑制植物生长。总体而言，根据这三个指标，研究区域南部的地下水水质优于北部，泾河流域的水质优于渭河流域。本研究为两个流域的可持续发展提供了依据，为地下水质量管理提供了基线数据。
