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Hydrogeochemical processes between surface and groundwaters on thenortheastern Chinese Loess Plateau: Implications for water chemistryand environmental evolutions in semi-arid regions
Zhang,F(Zhang,Fei)[1]; Jin,ZD(Jin,Zhangdong)[1]; Yu,JM(Yu,Jimin)[2]; Zhou,YK(Zhou,Yunkai)[3]; Zhou,L(Zhou,Ling)[1]
2015
Source PublicationJournal of Geochemical Exploration
Volume159Issue:2015Pages:115-128
Subtype期刊论文
Abstract

A large area of the continents is covered by loess that is subject to fast erosion, but detailed research is lacking about processes influencing the hydrogeochemistry in loess-covered regions. This study presents the first δ18O and δD, and major ion contents of various waters (rain, rivers, lake, springs and wells) from Daihai Lake catchment on the Chinese Loess Plateau (CLP). In combination with historical hydrological and meteorological data during the past 60 years, we investigate factors affecting water chemistry and lake evolution on the CLP, and thereby provide insight into hydrogeochemical processes under semi-arid climatic conditions. On the northeast CLP, river and groundwaters show elevated TDS (450 and 461 mg/L, respectively), about ~4 times higher than the global river mean value. Their water chemistry is dominantly influenced by carbonate weathering. Lake waters show even higher TDS at 5758 mg/L, ~50 times of the global mean, which is attributed to strong evaporation and associated with precipitation of calcite and dolomite. The order of carbonate (calcite and dolomite) saturation indexes follows lake water N river water N groundwater. Downstream rivers to the west of Daihai Lake are characterized by elevated SO4 2−, indicating high lake levels in the past. Comparison of δ18O, δD, TDS and ion contents of river and groundwaters implies that shallow groundwaters are derived from surface runoff via fast infiltration, a hydrological process different from limited infiltration of groundwater on the Tibetan Plateau. Water quality assessment indicates that all river and 79% of well waters belong to moderately hard to hard-fresh waters, suitable for drinking and irrigation of plants with moderate salt tolerance. In contrast, all lake and spring waters and 21% of well waters belong to very bad water quality, and hence are not suitable for irrigation or drinking. Owing to intensified human activities under drying and warming climate, the lake water level of Daihai declined by 4.83 m from 1955 to 2003, and started to accelerate since 1980. As a result, TDS and Cl− increased by 1.8 times and Mg/Ca rose by 156 times from 1953 to 2010. Our data show that environment degradation poses a great threat to human occupation on the CLP. Considering the uniformity of loess, hydrogeochemical processes between surface and groundwaters on the loess regions may represent a widespread status of the CLP.

KeywordDaihai Lake Chinese Loess Plateau Hydrogeochemistry Water Chemistry
DOI10.1016/j.gexplo.2015.08.010
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9471
Collection加速器质谱中心
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
2.Research School of Earth Sciences, The Australian National University, Canberra, ACT 2601, Australia;
3.College of Environment and Planning, Henan University, Kaifeng 475000, China
Recommended Citation
GB/T 7714
Zhang,F,Jin,ZD,Yu,JM,et al. Hydrogeochemical processes between surface and groundwaters on thenortheastern Chinese Loess Plateau: Implications for water chemistryand environmental evolutions in semi-arid regions[J]. Journal of Geochemical Exploration,2015,159(2015):115-128.
APA Zhang,F,Jin,ZD,Yu,JM,Zhou,YK,&Zhou,L.(2015).Hydrogeochemical processes between surface and groundwaters on thenortheastern Chinese Loess Plateau: Implications for water chemistryand environmental evolutions in semi-arid regions.Journal of Geochemical Exploration,159(2015),115-128.
MLA Zhang,F,et al."Hydrogeochemical processes between surface and groundwaters on thenortheastern Chinese Loess Plateau: Implications for water chemistryand environmental evolutions in semi-arid regions".Journal of Geochemical Exploration 159.2015(2015):115-128.
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