Hydrogen and Oxygen Isotope Characteristics of Water and the Recharge Sources in Subalpine of Qilian Mountains, China
Yang Shi 1  
,   Wenxiong Jia 1  
,   Guofeng Zhu 1, 2  
,   Dan Ding 3  
,   Ruifeng Yuan 1  
,   Xiuting Xu 1  
,   Zhiyuan Zhang 1  
,   Le Yang 1  
,   Hui Xiong 1  
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College of Geography and Environmental Science, Northwest Normal University, Lanzhou, Gansu Province, China
State Key Laboratory of Cryosphere Science, Northwest institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu Province, China
College of Geography and Tourism, Shaanxi Normal University, Xi’an, Shaanxi Province, China
Wenxiong Jia   

College of Geography and Environmental Science, Northwest Normal University, China
Submission date: 2020-07-21
Final revision date: 2020-09-13
Acceptance date: 2020-09-25
Online publication date: 2021-01-27
In order to explore the characteristics of hydrogen-oxygen isotopes and ecological hydrological processes in different water bodies in the subalpine zone of Qilian Mountains, China, precipitation, soil water, plant water, groundwater and river water samples were collected from the subalpine of the Eastern of Qilian Mountains section from July to August in 2015. Qualitative analysis was used in hydrogen and oxygen isotope characteristics of different water bodies. Then, the mixing model of MixSIAR based on Bayesian theory was used to quantify the water absorption depth of shrub plant and the proportion of water source replenishment between different water bodies. The purpose is to illustrate the water migration relationship between water bodies, thereby to clarify the ecological hydrological process in the subalpine shrub area of Eastern Qilian Mountains. Results indicate that: (1) The isotopic values of various water bodies in the study area are affected by changes in the amount of precipitation, but precipitation has a smaller impact on river water. (2) Soil water of 0~20 cm is affected easily by precipitation and evaporation, while soil water of 60~80 cm is affected strongly by groundwater. (3) The water content of shrub plant in study area is mainly derived from precipitation and soil water under 0~20 cm. (4) Although the direct influence on the values of δ18O in groundwater and river water by precipitation is not obvious and their variation ranges are small, there are different degrees of response to precipitation, and river water responds faster to precipitation than groundwater.