布哈河流域不同水体稳定同位素特征分析  

Analysis of Stable Isotope Characteristics of Different Water Bodies in the Buha River Basin

作  者:陈亚荣 李星玥 陈克龙 CHEN Yarong;LI Xingyue;CHEN Kelong(College of Geographical Sciences,Qinghai Normal University,Xining 810008,China;Qinghai Provincial Key Laboratory of Physical Geography and Environmental Process,College of Geographical Science,Qinghai Normal University,Xining 810008,China;Institute of Plateau Science and Sustainable Development,Xining 810008,China;National Station of Locating Observation and Research for Wetland Ecosystem in Qinghai Lake,Haibei 812200,China)

机构地区:[1]青海师范大学地理科学学院,青海西宁810008 [2]青海师范大学地理科学学院青海省自然地理与环境过程重点实验室,青海西宁810008 [3]高原科学与可持续发展研究院,青海西宁810008 [4]青海青海湖湿地生态系统国家定位观测研究站,青海海北812200

出  处:《水文》2025年第1期83-89,105,共8页Journal of China Hydrology

基  金:第二次青藏高原综合科学考察研究项目(2019QZKK0405);青海省重点研发与转化计划(2022-QY-204);青海省科技计划(2023-ZJ-905T)。

摘  要:基于青海湖布哈河流域夏季降水、河水、土壤水和泉水δ^(2)H、δ^(18)O数据,对研究区不同水体稳定同位素及氘盈余(d-excess)进行特征分析,探讨海拔对河水和土壤水稳定同位素的影响,利用后向轨迹模型模拟降水水汽来源。结果表明:(1)水体稳定同位素均值从大到小依次为:土壤水>河水>泉水>降水,相对于河水、土壤水和泉水,降水稳定同位素变幅更大,降水d-excess均值最大,土壤水d-excess均值最小。(2)布哈河流域夏季大气降水线为:δ^(2)H=8.34δ^(18)O+36.05(R2=0.99),其斜率和截距均高于河水、土壤水和泉水,降水是其他水体主要补给来源,河水特征线的斜率与土壤特征线的斜率相近,二者的补给关系最为密切。(3)河水δ^(2)H和δ^(18)O在空间上表现为西北低、东南高的特点,与海拔呈负相关关系;土壤水δ^(2)H和δ^(18)O在空间上表现为西北高、东南低的特点,与海拔呈正相关关系,河水和土壤水海拔效应均不显著。(4)后向轨迹模拟布哈河流域夏季降水水汽主要来自西风携带的大西洋水汽,占比为50%,同时低海拔水汽源地以局地蒸发的陆地气团为主。研究结果可为布哈河流域水文循环和气候应对提供理论依据。Based on theδ^(2)H andδ^(18)O data of summer precipitation,river,soil water and spring in the Buha River Basin,this study analyzed the characteristics of stable isotopes and d-excess in different water bodies,discussed the influence of altitude on the stable isotopes of river and soil water,and simulated the source of precipitation vapor by using the backward trajectory model.The results show:(1)The order of stable isotope are as follows:soil water>river>spring>precipitation,and range of the stable isotope of precipitation is greater than that of river,soil water and spring,and the mean of deuterium surplus d-excess of precipi⁃tation is the largest,and the mean of d-excess of soil water is the smallest.(2)The atmospheric precipitation line in the Buha River Basin in summer isδ^(2)H=8.34δ^(18)O+36.05(R2=0.99),and its slope and intercept are higher than those of river,soil water and spring.Precipitation is the main source of recharge for other water bodies,and the slope of the river characteristic line is similar to the slope of the soil characteristic line,of which the replenishment relationship is the closest.(3)Theδ^(2)H andδ^(18)O of river are spatially low in the northwest and high in the southeast,which are negatively correlated with altitude.Theδ^(2)H andδ^(18)O of soil water are high in the northwest and low in the southeast,which are positively correlated with altitude,and the elevation ef⁃fects of river and soil water are not significant.(4)The simulation of backward trajectory shows that the summer precipitation va⁃por in the Buha River Basin mainly comes from the Atlantic vapor carried by westerly winds,accounting for 50%,and the lowaltitude water vapor source is dominated by locally evaporating land air masses.The results could provide a theoretical reference for the hydrological cycle and climate response in the Buha River Basin.

关 键 词:布哈河流域 稳定同位素 河水 土壤水 降水 泉水 

分 类 号:P342[天文地球—水文科学]

 

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