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Assessing the Influences of Land Use Change on Groundwater Hydrochemistry in an Oasis-Desert Region of Central Asia

Wang, Wanrui ; Chen, Yapeng ; Wang, Weihua ; Yang, Yuhai ; Hou, Yifeng ; Zhang, Shuai ; Zhu, Ziyang

Water (Basel), 2022-02, Vol.14 (4), p.651 [Periódico revisado por pares]

Basel: MDPI AG

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Título:
Assessing the Influences of Land Use Change on Groundwater Hydrochemistry in an Oasis-Desert Region of Central Asia
Autor: Wang, Wanrui ; Chen, Yapeng ; Wang, Weihua ; Yang, Yuhai ; Hou, Yifeng ; Zhang, Shuai ; Zhu, Ziyang
Assuntos: Agricultural land ; Agriculture ; Analysis ; Anthropogenic factors ; Aquatic resources ; Aquifers ; Arid regions ; Chemical evolution ; China ; Confined groundwater ; Crystallization ; Cultivated lands ; Deserts ; Deterioration ; Ditches ; Drainage ditches ; Economic development ; Ecosystems ; Evaporation ; Evolution ; Exploitation ; Geology ; Groundwater ; groundwater hydrochemistry ; Groundwater management ; Groundwater overdraft ; Groundwater quality ; Heterogeneity ; Human influences ; Hydrochemistry ; Hydrogeology ; India ; Irrigation ; Isotopes ; Laboratories ; Land use ; land use change ; Oases ; oasis-desert region ; Overexploitation ; Patchiness ; Precipitation ; River water ; Rivers ; Saline water ; Salinity ; Seasonal variation ; Seasonal variations ; Seasons ; Security ; Sediments ; Soils, Salts in ; Spatial distribution ; Spatial heterogeneity ; spatiotemporal distribution ; Stable isotopes ; Stream flow ; Sulphates ; Surface water ; Surface-groundwater relations ; Tarim Basin ; Temporal distribution ; Water analysis ; Water chemistry ; Water quality ; Water samples ; Water sampling ; Water, Underground
É parte de: Water (Basel), 2022-02, Vol.14 (4), p.651
Descrição: Land use change greatly affects groundwater hydrochemical cycling and thereby food and ecosystem security in arid regions. Spatiotemporal distribution of groundwater hydrochemistry is vital to understand groundwater water-salt migration processes in the context of land use change, while it is not well known in the oasis-desert region of arid inland basins. Here, to investigate the influences of land use change on groundwater hydrochemistry and suggest sustainable management, 67 water samples were obtained in the Luntai Oasis, a typical oasis desert of Central Asia. Stable isotopes and chemical components of samples were analyzed. Piper and Gibbs plots were used to elaborate the chemical type and major mechanisms controlling water chemistry, respectively. The results showed that cultivated land area has markedly expanded in the Luntai Oasis over the last 20 years (increasing by 121.8%). Groundwater seasonal dynamics and groundwater–surface water interaction were altered dramatically by farmland expansion and groundwater exploitation. Specifically, the spatial heterogeneity and seasonal variability of groundwater hydrochemistry were significant. Compared with the desert area, the δ18O and TDS of river water and shallow groundwater in the oasis cropland exhibited lower values but greater seasonal variation. Higher TDS was observed in autumn for river water, and in spring for shallow groundwater. The chemical evolution of phreatic water was mainly controlled by the evaporation-crystallization process and rock dominance, with a chemical type of Cl-SO4-Na-Mg. Significant spatiotemporal heterogeneity of groundwater hydrochemistry demonstrated the influence of climatic, hydrogeological, land use, and anthropogenic conditions. Groundwater overexploitation would cause phreatic water leakage into confined water, promoting groundwater quality deterioration due to fresh saltwater mixing. Improving agricultural drainage ditches in conjunction with restricting farmland expansion and groundwater extraction is an effective way to alleviate groundwater environment deterioration and maintain oasis-desert ecosystems in arid regions.
Editor: Basel: MDPI AG
Idioma: Inglês

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Assessing the Influences of Land Use Change on Groundwater Hydrochemistry in an Oasis-Desert Region of Central Asia

Wang, Wanrui ; Chen, Yapeng ; Wang, Weihua ; Yang, Yuhai ; Hou, Yifeng ; Zhang, Shuai ; Zhu, Ziyang

Basel: MDPI AG

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