王继华, 郑凯, 豆敬峰,等.黄河焦作段河岸植物水分来源同位素水文学解析[J].河南理工大学学报（自然科学版）,2024,43(4):87-95.

WANG J H, ZHENG K, DOU J F, et al.Isotope hydrological analysis of water source for riparian plants in Jiaozuo Section of the Yellow River[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):87-95.

黄河焦作段河岸植物水分来源同位素水文学解析

王继华1,2,3, 郑凯1,2,3, 豆敬峰1,2,3, 李涛1,2,3, 黄平华4

1.河南省自然资源监测和国土整治院，河南 郑州  450016;2.自然资源部黄河流域中下游水土资源保护与修复重点实验室，河南 郑州  450016;3.河南省自然资源科技创新中心（地下水资源调查监测研究），河南 郑州  450016;4.河南理工大学 资源环境学院，河南 焦作  454000

摘要: 目的 为探究河岸植物的水分来源， 方法 以黄河中游典型河段河岸生态植物为研究对象，分析氢氧稳定同位素、氯离子浓度和土壤含水率特征，并结合贝叶斯混合模型MixSIAR解析河岸生态植被水分来源。 结果 结果表明：δ2H-δ18O图谱显示土壤水线为δ2H=5.74δ18O-15.67，斜率明显小于当地大气降水线斜率；土壤水excess（土壤水同位素点偏离LMWL的程度）显示土壤水同位素δ²H-δ¹⁸O关系点显著偏离LMWL；河岸植物（芦苇和柽柳）木质部水δ²H，δ¹⁸O值与土壤水线基本重叠；垂向土壤含水率、稳定同位素（δ²H，δ¹⁸O）、Cl-质量浓度具有明显分层特征；贝叶斯混合模型MixSIAR模拟结果指示，土壤水对柽柳和芦苇水分贡献率为60.3%~73.6%，河水对柽柳和芦苇水分贡献率为10.3%~19.2%，再次为潜水；校正后的计算结果表明，河水对植物水分贡献率显著上升，最大上升至30.3％，土壤水贡献率降至53.9%~60.6%。 结论 研究区降水、河水、潜水和土壤水之间水力联系紧密，具有强烈补给关系，且土壤水受到过强蒸发；植物水的主要水分来源为土壤水，其次是河水；不同层土壤含水率（浅层、中层、深层）因主要水源不同，以致含水率随埋深增加呈不同变化趋势，且土壤含水率是影响植物水分利用的关键因子。研究结果对河岸典型植物水分利用机理研究具有一定理论意义。

关键词:黄河焦作段;河岸植被;氢氧稳定同位素;贝叶斯混合模型;水分来源

doi:10.16186/j.cnki.1673-9787.2022050078

基金项目:国家自然科学基金资助项目（42172283）；河南省自然资源厅自然资源科技项目（豫财招标采购-2021-178-5）

收稿日期:2022/02/28

修回日期:2022/05/30

出版日期:2024/07/15

Isotope hydrological analysis of water source for riparian plants in Jiaozuo Section of the Yellow River

WANG Jihua1,2,3, ZHENG Kai1,2,3, DOU Jingfeng1,2,3, LI Tao1,2,3, HUANG Pinghua4

1.Institute of Natural Resources Monitoring and Comprehensive Land Improvement of Henan Province，Zhengzhou  450016，Henan，China;2.Key Laboratory of Water and Soil Resources Protection and Rehabilitation in the Middle and Lower Reaches of the Yellow River Basin，Ministry of Natural Resources，Zhengzhou  450016，Henan，China;3.Henan Natural Resources Science and Technology Innovation Center（Investigation and Monitoring of Groundwater Resources），Zhengzhou  450016，Henan，China;4.School of Resources and Environment，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract: Objectives To explore the water supply source of the riparian plants，  Methods  typical riparian ecological plants in the middle reaches of the Yellow River are taken as the research object in this paper.The characteristics of hydrogen and oxygen stable isotopes，chloride ion concentrations，and soil moisture content are analyzed，and the Bayesian mixed model MixSIAR was used to analyze the water sources of riparian ecological vegetation.  Results The results reveal that the δ²H-δ¹⁸O map shows the soil water line of δ²H=5.74 δ¹⁸O-15.67，with its slope significantly lower than the local atmospheric precipitation line slope LMWL.The soil water lc-excess （degree of deviation of soil water isotope points from LMWL） value shows that soil water isotope δ²H-δ¹⁸O relationship points deviate significantly from LMWL.The δ²H and δ¹⁸O values of the xylem water of riparian plants（Phragmites australis and Tamarix chinensis Lour） overlaps with the soil water line.The vertical soil moisture content，stable isotopes（δ²H，δ¹⁸O），and Cl- mass concentration had significant stratification characteristics.The simulation results of the Bayesian MixSIAR indicate that soil water contributes 60.3%~73.6% the water content of Tamarix and Phragmites australis，while river water contributes 10.3%~24.7% of it.What comes next is phreatic water.The corrected calculation results show that the contribution rate of river water to plant water has increased significantly，reaching a maximum of 30.3%，and the contribution rate of soil water decreased to 53.9%~60.6%.  Conclusions The hydraulic connection between precipitation，river water，groundwater，and soil water in the research area is close，with a strong replenishment relationship，and the soil water is subject to excessive evaporation.The main source of plant water is soil water，followed by river water.The soil moisture content of different layers（shallow，middle and deep layers） shows different trends with the increase of buried depth with increasing burial depth due to different main water sources，and soil moisture content is a key factor affecting plant water use.The research results have certain theoretical significance for the study of water utilization mechanism of typical riparian plants.

Key words:Jiaozuo Section of the Yellow River;riparian vegetation;stable hydrogen and oxygen isotopes;Bayesian mixture model;water sources