干旱半干旱荒漠化草原区降水-地表水-地下水同位素分布特征——以达尔罕茂明安联合旗为例  

Characteristics of Stable Isotopes in Precipitation,Surface Water and Groundwater in the Arid and Semi-arid Desertification Steppe:A Case Study in the Darhan Maomingan Joint Banner

作　　者：韩振华[1] 张燕飞[1] 王慧琪 焦瑞[1] 梁文涛[1] 纪刚 HAN Zhen-hua;ZHANG Yan-fei;WANG Hui-qi;JIAO Rui;LIANG Wen-tao;JI Gang(Institute of Water Resources for Pastoral Area,Ministry of Water Resources,Hohhot 010020,China)

机构地区：[1]水利部牧区水利科学研究所,呼和浩特010020

出　　处：《科学技术与工程》2020年第28期11463-11471,共9页Science Technology and Engineering

基　　金：中国水利水电科学研究院科研专项(MK2016J15,MK2017J01);国家重点研发项目(2017YFC1502400);中央分成水资源费项目(126301002000180003)。

摘　　要：为揭示研究尚处于初级阶段的干旱半干旱荒漠化草原区水循环机理,应用被视为水体“DNA”探索的同位素示踪方法,对以达尔罕茂明安联合旗为例的干旱半干旱荒漠化草原区所采集的降水、地表水和地下水中同位素含量的时空分布特征进行探究。根据降水氢氧同位素含量及其氘盈余的变化过程,发现研究区大气降水水汽在夏季主要受海洋季风的影响、冬季主要受蒙古高压影响,而且从时空变化来看研究区地表水和地下水同位素含量随时间变化不大,但由于纬度和降水源区不同的影响随着自西向东的空间变化各水体同位素含量逐渐变大。此外,研究区地表水和地下水同位素含量均散落于当地大气降水方程线下方,说明研究区域内地表水和地下水的补给来源主要为降水,并且部分区域地表水与地下水同位素含量分布比较集中,属于交叉分布,说明这些区域还存在地表水和地下水转换互补。The arid and semi-arid desertification steppe is still in the initial stage.In order to reveal its water cycle mechanism,an isotope tracer method,which was regarded as the way to explore“DNA”of the water,was used to study the temporal and spatial distribution characteristics of isotope content in the precipitation,surface water and groundwater collected in the arid and semi-arid desertification such as Darhan Maomingan Joint Banner.According to the content of hydrogen and oxygen isotope in the precipitation and the change process of the surplus value of deuterium,it was found that the atmospheric precipitation water vapor in the research area was mainly affected by the ocean monsoon in summer and by Mongolian high pressure in winter.The isotopic content in the surface water and groundwater in the area didn’t change much with time,but influenced by different latitude and precipitation source,the isotope content of each water body gradually increases from west to east spatially.In addition,the isotope content in the surface water and groundwater in the area were scattered below the local atmospheric precipitation equation line,revealing that the recharge sources of surface water and groundwater here were mainly precipitation.What’s more,the centralized and intersected distribution of isotope content in the surface water and groundwater in some areas suggested that there were complementation and conversion between the surface water and groundwater in these areas.

关 键 词：同位素示踪技术 时空变化 荒漠化草原区 分布特征 水循环 

分 类 号：P641[天文地球—地质矿产勘探]