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| 用D、18O同位素确定黑河中游戈壁地区植物水分来源 | |
| 引用本文： | 余绍文,孙自永,周爱国,张溪,段丽军,许书刚.用D、18O同位素确定黑河中游戈壁地区植物水分来源[J].中国沙漠,2012,32(3):717-723. |
| 作者姓名： | 余绍文 孙自永 周爱国 张溪 段丽军 许书刚 |
| 作者单位： | 1. 中国地质调查局武汉地质调查中心,湖北武汉,430205 2. 中国地质大学环境学院,湖北武汉430074 中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 3. 中国地质大学环境学院,湖北武汉,430074 4. 中国地质大学研究生院,湖北武汉,430074 |
| 基金项目： | 国家自然科学基金项目，中国地质大学(武汉)优秀青年教师计划项目 |
| 摘 要： | 于2008年7月在黑河中游临泽县平川镇戈壁地区采集降雨、地下水、土壤和植物茎干样品并进行水分的D、18O同位素测试，分析戈壁地区不同深度土壤水分的来源，确定泡泡刺（Nitraria sphaerocarpa）、红砂（Reaumuria soongorica）等荒漠植物的吸水层位及其对降雨和地下水的依赖程度。研究发现：①土壤剖面0~130 cm深度范围内的土壤水主要接受降雨的补给；130 cm以下，可能接受潜水蒸发补给，或者是前期较大降雨入渗与潜水蒸发补给的叠加；②土壤水的δD、δ18O值与深度呈指数关系；降雨入渗补给会打乱剖面的稳态，土壤水的δD、δ18O同位素组成是现存土壤水和降雨的混合；③泡泡刺和红砂都是利用深度大于185 cm的土壤水，泡泡刺吸水层位比红砂更深，表明荒漠植物的生长主要依赖更为稳定的潜水水源。 |
| 关 键 词： | 水分来源 氢氧同位素 黑河 |
| 收稿时间： | 2011-10-23; |
Determination of Water Sources of Gobi Plants by D and ^18O Stable Isotopes in Middle Reaches of the Heihe River |
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| YU Shao-wen,SUN Zi-yong,ZHOU Ai-guo,ZHANG Xi,DUAN Li-jun,XU Shu-gang.Determination of Water Sources of Gobi Plants by D and ^18O Stable Isotopes in Middle Reaches of the Heihe River[J].Journal of Desert Research,2012,32(3):717-723. | |
| Authors: | YU Shao-wen SUN Zi-yong ZHOU Ai-guo ZHANG Xi DUAN Li-jun XU Shu-gang |
| Institution: | 1.Wuhan Centre of China Geological Survey,Wuhan 430205,China;2.School of Environmental Studies,China University of Geosciences,Wuhan 430074,China;3.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;4.Graduate School,China University of Geosciences,Wuhan 430074,China) |
| Abstract: | The δD and δ18O values of rainfall,groundwater,soil water and water extracted from two Gobi plants were measured to analyze the sources of soil water at different depths in the Gobi area in Linze in the middle reaches of Heihe River,and to determine the soil layer in which two Gobi plants extract water and their dependence on rainfall and groundwater.Results show that:(1) Soil water at the layer above 130 cm in depth are mainly recharged by rainfall,and that below 130 cm are recharged by evaporation of phreatic water or the infiltration of earlier heavy rainfall;(2) δD and δ18O values of soil water decline with soil depth,and there is a typical exponential relation,and δD and δ18O values of soil water are influenced by both current soil water and infiltration of rainfall;and(3) Nitraria sphaerocarpa and Reaumuria soongorica extract soil water below the depth of 185 cm,but Nitraria sphaerocarpa extracts deeper soil water than Reaumuria soongorica does,which indicate that the growth of desert plants mainly rely on phreatic water which is more stably available. |
| Keywords: | water sources hydrogen and oxygen isotopes Heihe River |
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