达尔罕茂明安联合旗地表水-土壤水-地下水同位素含量时空分布特征分析

Temporal and Spatial Distribution Characteristics of Isotope Content in Surface Water-Soil Water-Groundwater of Dalhan Maomingan Joint Banner

为探明达尔罕茂明安联合旗地表水-土壤水-地下水时空分布特征,应用被视为水体“DNA”探索的同位素示踪方法,对达尔罕茂明安联合旗4个典型区进行地表水、土壤水和地下水进行采样分析,并根据同位素检测结果对各水体的时空分布特征进行探究,揭示出研究区地表水、地下水和土壤水的主要补给来源及其时空变化规律,发现研究区地表水、土壤水和地下水主要补给来源为大气降水,仅在部分时段和区域产生互补,从时空变化来看研究区地表水、地下水随时间变化不大但随着自西向东的空间变化同位素含量逐渐变大,而土壤水则是随着空间的变化不大,在随时间变化中,0~125 cm深度土壤水受外界环境影响随时间变化较大,而深层土壤水同位素含量则逐渐趋于稳定。

In order to find out the spatial and temporal distribution characteristics of surface water-soil water-groundwater in the Dalhan Maomingan Joint Banner,this paper applies the isotope tracing method,which is regarded as the“DNA”exploration of water body,to conduct sampling analysis of surface water,soil water and groundwater in four typical areas.According to the results of isotope detection,the spatial and temporal distribution characteristics of each water body are explored.It is revealed that the main recharge source of surface water,soil water and groundwater in the study area is atmospheric precipitation,which only complements in some time periods and regions.From the perspective of time and space changes,the surface water and groundwater in the study area change little with time,but the isotope content gradually increases with the spatial change from west to east.The soil water is not changed with the space.In the change with time,the soil water at a depth of 0~125 cm changes greatly with time under the influence of external environment,while the isotope content of deep soil water gradually tends to be stable.