Multi-isotopes (δD, δ18Owater, 87Sr/86Sr, δ34S and δ18Osulfate) as indicators for groundwater salinization genesis and evolution of a large agricultural drainage lake basin in Inner Mongolia, Northwest China

Groundwater salinization, a major eco-environmental problem in arid and semi-arid areas, can accelerate soil salinization, reducing crop productivity and imbalances in ecosystem diversity. This study classified water samples collected from the Ulansuhai Lake basin into five clusters using self-organ...

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Veröffentlicht in:The Science of the total environment Jg. 946; S. 174181
Hauptverfasser: Qu, Shen, Zhao, Yuanzhen, Zhang, Keyi, Wang, Juliang, Li, Muhan, Yang, Xu, Ren, Xiaohui, Hao, Yanling, Yu, Ruihong
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Netherlands Elsevier B.V 10.10.2024
Schlagworte:
Bayesian theory
China
drainage
ecosystems
environment
environmental protection
fractionation
Groundwater salinization
humans
isotopes
Isotopic models
saline water
sewage
soil salinization
Spatial characteristics
Stable isotopes
Ulansuhai Lake basin
water management
water salinity
water salinization
watersheds
Yellow River
China
Yellow River
Ulansuhai Lake basin
Groundwater salinization
Isotopic models
Spatial characteristics
Stable isotopes
ISSN:0048-9697, 1879-1026, 1879-1026
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Zusammenfassung:Groundwater salinization, a major eco-environmental problem in arid and semi-arid areas, can accelerate soil salinization, reducing crop productivity and imbalances in ecosystem diversity. This study classified water samples collected from the Ulansuhai Lake basin into five clusters using self-organizing maps (SOM). On this basis, multiple isotopes (δ18Owater, δD, 87Sr/86Sr, δ18Osulfate and δ34S) and isotopic models (Rayleigh fractionation and Bayesian isotope mixing models) were used to identify and quantify the genesis and evolution of groundwater salinization. The results showed that the samples were brackish or saline water, and the hydrochemical types were dominated by Na + K-Cl (SO4). It has been proved that the processes associated with groundwater salinization in the Ulansuhai Lake basin were dominated by water-rock interaction and human inputs. Among them, evaporite dissolution contributed substantially to groundwater salinity. Furthermore, salt inputs from human activities cannot be negligible. Based on the model calculations, evaporite dissolution accounted for the most significant proportion of all sources, with a mean value of 53 %. In addition, human inputs from regular agricultural activities (28 % from sewage and manure and 8 % from fertilizers) constituted another vital source of groundwater salinization associated with extensive agricultural activities in the study area. This study's results can deepen our understanding of the genesis of groundwater salinization and the evolution of the agricultural drainage lake basin. This knowledge will assist the Environmental Protection Department in developing effective policies for groundwater management in the Yellow River Basin. [Display omitted] •Multiple isotopes are used to identify groundwater salinization genesis and evolution.•Evaporite dissolution and human inputs mainly contribute to groundwater salinity.•Isotopic models are used to quantity the genesis of groundwater salinization.•The western side of Ulansuhai Lake faces severe groundwater salinization.•Results provide strategies for regional water management and protection.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2024.174181