title: [Characteristics of Hydrogen and Oxygen Isotopes of Soil Water in the Water Source Area of Yuanyang Terrace].
abstract: Stable isotope techniques provide a new approach to study soil water movement. The precipitation and the soil water from 0 to 100 cm soil layer in 4 kinds of typical vegetation types (forest, shrub forest, grassland and non-forest land) over the water source area of Yuanyang terrace were sampled, and their isotope compositions were analyzed, aimed to understand the characteristics of stable isotopes in different depth of the soil water. The results showed that the meteoric water line in the water source area of Yuanyang terrace was δD = 6.838 4δ(18)O-5.6921 (R2 = 0.8787, n = 20), the slope and intercept were less than the global atmospheric precipitation. The hydrogen and oxygen stable isotopes in the soil water of the 4 kinds of typical types was lower than the local meteoric water line side and the fluctuation of isotope value on surface soil profile was greater. With the increasing soil depth, the fluctuation of delta 18O value was smaller and smaller, especially in the 80-100 cm soil layer which was the most obvious. The delta 18O values of the deep soil water in forest and grassland were higher than that in the surface soil. while it was on the contrary in shrub forest and non-forest land.
authors.forename: Xiao-juan
authors.initials: XJ
authors.lastname: Zhang
authors.forename: Wei-feng
authors.initials: WF
authors.lastname: Song
authors.forename: Jin-kui
authors.initials: JK
authors.lastname: Wu
authors.forename: Zhuo-juan
authors.initials: ZJ
authors.lastname: Wang
mesh_terms: D002681:China; D002980:Climate; D003903:Deuterium / Q000032:analysis*; D065928:Forests; D065948:Grassland; D010103:Oxygen Isotopes / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014872:Water Movements
chemical_list: D010103:Oxygen Isotopes; D012987:Soil; D014867:Water; D003903:Deuterium