doi:10.16186/j.cnki.1673-9787.2022050078

Received:2022-02-28

Revised:2022-05-30

Online Date: 2023-12-07

Analysis of water source of riparian plants in Jiaozuo Section of the Yellow Riverbased on isotope hydrology（Online）

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

1.Henan Province Natural Resources Monitoring Institute，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 Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:Riparian vegetation is the ecological barrier of river basins and the key defense line of defense to prevent pollutants from going into rivers, and it is also the core part of the life community of mountains, rivers, forests, fields, lakes and grasses, and water source is a key factor for the ecological construction of riparian plants. In this paper, typical riparian ecological plants in Jiaozuo section of the Yellow River are studied as the research object, and the characteristics of hydrogen and oxygen stable isotopes, chloride ion concentrations and soil moisture content are analyzed experimentally. After analyzing the water sources for riparian ecological vegetation with Bayesian mixture model MixSIAR, the author obtains the following results. The δ²H-δ¹⁸O map shows that the soil water line is δ²H=5.74δ¹⁸O-15.67, and its slope is significantly lower than the 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, which indicated that soil water is subject to strong evaporation. Theδ²H andδ¹⁸O values of the xylem water of riparian plants (Phragmites australis and Tamarix chinensis) overlaps with the soil water line, indicating that the water of P. australis and T. chinensis is supplied by soil water. The Bayesian MixSIAR simulation indicates that soil water contribute 60.3%~73.6% to T. chinensis and P. australis water, while the river water contribute 10.3%~24.7% to it. What comes next is phreatic water and the soil moisture content is a key factor affecting plants water use. The corrected calculation result showes that the contribution rate of river water to plant water increased significantly, and the contribution rate of soil water decreased to 53.9% ~ 60.6%. This paper has 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

中图分类号:P342