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盐生荒漠土壤水稳定氢、氧同位素组成季节动态/Analysis on Seasonal Dynamics of δ18O and δD in Soil Water at a Saline Desert Site in the Southeastern Junggar Basin[J]
Authors
中国科学院大学,北京100049
中国科学院新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室/新疆阜康荒漠生态系统国家野外科学观测研究站,新疆乌鲁木齐,830011
+4 more
周海
唐立松
李彦
郑新军
Publication date
1 January 2014
Publisher
Abstract
对准噶尔盆地东南缘降水和土壤水稳定氢、氧同位素组成(δ18O和δD)进行了测定,分析了降水中δ18O和δD值的季节变化规律、表层土壤水中188O和δD值对降水脉冲的动态响应以及不同深度土壤水中188O和δD值的变化特征.结果表明:该区域大气降水线为δD=7.691 δ18O+4.606;降水与表层土壤水中188O和18值表现出明显的季节变化特征;表层土壤水中δ18O和δD值、质量含水量对降水脉冲响应显著,且不同量级的降水导致不同程度的响应.利用LSD法对0~300 cm土层内土壤水中δ18O和δ值进行多重比较分析,可将土壤在垂直方向上分为3层,表层(0~50 cm)土壤水分活跃,稳定同位素值随深度的增加而迅速减小;中间层(50~180 cm)土壤水分相对活跃,既受到降水入渗和蒸发作用的影响,也有地下水的补给;深层(180~300 cm)水分来源稳定,土壤水中δ18O和δD值基本不变
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Last time updated on 29/11/2016