内蒙古阿拉善腰坝绿洲地下水水化学特征

The groundwater chemical characteristics in the Yaoba oasis of Alxa area,Inner Mongolia

绿洲是荒漠区适宜多种生物共同生息繁衍的地域。在全球气候变化和高强度人类活动的影响下,干旱区绿洲赖以生存的地下水环境日益恶化,已成为制约生态环境建设和经济社会发展的重要因素。选取具有典型代表意义的内蒙古阿拉善盟腰坝绿洲为研究区,对地下水进行取样分析,全面系统地研究地下水水化学成分的空间变化特征,研究结果表明:绿洲地下水水化学类型和TDS自东向西,自北向南具有典型的水平分带性分异规律,季节性变化差异大,水动力条件逐渐变差,C l-、Mg2+、Na+离子等高盐分离子逐渐富集,易溶盐逐渐累积,水体总体向咸化方向发展。

Oasis is the region that fits for various living creatures multiplying greatly together in the hungriness area. Its groundwater environment is ever deteriorating due to the impacts of the global climate changes and the excessive high human activities, and it become the important factor restricting the ecoenvironmental construction and the socioeconomic development. This research took Yaoba oasis of Alxa area as the typical study case, and the groundwater samples were analyzed scientifically and systemically from the spatial and the temporal variation of the hydrochemistry characteristics and the evolution laws of groundwater, it was concluded that the hydrochemistry of groundwater was characterized by the horizontal zonation differentiation from the supply sources to the discharge area and showed seasonal variations, and evolved the trend of salt, basification, complication, and water environment was being negatively influenced.