黄土区典型小流域包气带土壤水同位素特征

发布时间：2018-04-24 11:52

  本文选题：降水 + 土壤水　； 参考：《水土保持学报》2017年03期

【摘要】：通过野外调查与室内试验相结合的方法,对王茂沟流域降水及5种土地利用类型土壤剖面稳定氢氧同位素特征进行对比分析,为黄土区土壤水分运移机制、模型参数识别及生态保护与重建提供科学依据。结果表明:(1)降水与5种土地利用方式下土壤水中δD和δ~(18) O的变化范围分别为(-118.08‰)~(-14.37‰),(-16.13‰)~(1.41‰)和(-92.36‰)~(-34.98‰),(-12.48‰)~(-5.01‰),平均值分别为-37.36‰,-5.65‰和-60.18‰,-7.81‰。(2)不同土地利用类型的土壤水氢氧同位素变化存在显著性差异,土壤通透性草地梯田林地坝地坡耕地,表层土壤水分的蒸发分馏程度梯田草地坝地坡耕地林地。(3)林地和草地"优先流"现象明显,草地"优先流"程度最大,林地能显著延伸"优先流"发生路径。(4)草地、林地和梯田分别在160,200,200cm土层及以下氢氧同位素值相对稳定,坝地和坡耕地可能对地下水水质与补给造成较大影响。
[Abstract]:By means of field investigation and laboratory test, the stable hydrogen and oxygen isotopic characteristics of precipitation and soil profiles of five types of land use in Wang Mao Valley were compared and analyzed, which was the mechanism of soil water migration in loess area. The model parameter identification and ecological protection and reconstruction provide scientific basis. The results show that the variation range of 未 D and 未 ~ (18) O in soil water under different land use patterns are -118.08 鈥，

本文编号：1796511