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中文摘要：
根据2003年夏季测得的四川卧龙自然保护区亚高山暗针叶林地区3个不同群落的降水、土壤水、浅层地下水（泉水）氢稳定同位素含量（δD），分析土壤剖面各层次土壤水氢稳定同位素的变化规律及其与水分迁移的关系。结果表明：1）土壤表层（枯枝落叶层）水δD受降水δD的直接影响，并且与降水δD有相同的变化趋势；2）A、B、C群落土壤垂直剖面的土壤水δD空间分布形式反映了降水δD的时间变化特征。0-20cm上层土壤水δD值很低，20—40cm时迅速升高，50—60cm时基本稳定，50—60cm深层土壤水δD受浅层地下水δD的影响增强；3）土壤水δD介于降水δD与浅层地下水δD之间，表明卧龙亚高山暗针叶林土壤水源于降水与浅层地下水。在一次性降水14．8mm后5天内，降水对枯枝落叶层的贡献率最高为75．49％-99．91％，对0—5cm土壤水的贡献率次之为66．68％-83．01％，对30—40cm土壤水的贡献率为24．50％-80．57％，对50—60cm土壤水贡献率最低为21．22％-29．17％；4）浅层地下水δD受降水δD的直接影响不明显，变化幅度很小，浅层地下水δD的稳定性说明地下水代表了多年降水的平均状态。
英文摘要：
The objective of this paper was to determine the relationships between the behaviors of stable isotope contents （δD） and the patterns of water transportation in precipitation, spring water and soil water. Water samples were taken from 3 community types of sub-alpine dark coniferous forest in the Wolong Nature Reserve of Sichuan Province, China, during the summer of 2003. The results showed： 1） The δDin surface soil （litter layer） water was directly affected by δD of precipitation because they displayed similar dynamics; 2） The distribution pattern of δD for the soil profiles of the 3 communities reflected the change of δD for the precipitation. The δD values were low in the upper soil layer （0 - 5 cm）, increased rapidly in the middle soil layer （30 - 40 cm）, and became stable in the lower soil layer （50 - 60 cm） ; 3） Soil water δD in the surface layer seemed to be also influenced by the δD values in shallow underground water; 4） The δD value of soil water ranged between the δD value of precipitation and that of underground water, which indicated that both precipitation and underground water were the sources of soil water in these sub-alpine dark coniferous forests. Within 5 days of a 14.8 mm rain event, the contribution of precipitation to soil water decreased with increase of soil depth： 75.49% - 99.97% in the litter layer, 66.68% - 83.01% in 0 - 5 cm, 24.50% - 80.57% in 30 - 40 cm, and 21.22% - 29.17% in 50 - 60 cm, respectively. 5） The δD value of shallow underground water changed little and was not significantly affected by the δD of precipitation. The constant value of δD may suggest that shallow underground water represent the average conditions of precipitation over the years.
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