img

官方微信

高级检索

中国沙漠 ›› 2024, Vol. 44 ›› Issue (1): 102-110.DOI: 10.7522/j.issn.1000-694X.2023.00058

• • 上一篇    

长江源区植物水分来源的量化解析

刘晓颖1(), 李宗杰1(), 刘梦晴1, 徐斌1, 桂娟2, 崔乔2, 薛健2, 段然1   

  1. 1.兰州理工大学 能源与动力工程学院,甘肃 兰州 730050
    2.中国科学院西北生态环境资源研究院 高寒山区同位素生态水文与国家公园观测研究站/甘肃省祁连山生态环境研究中心/干旱区生态安全与可持续发展全国重点实验室,甘肃 兰州 730000
  • 收稿日期:2023-03-27 修回日期:2023-04-28 出版日期:2024-01-20 发布日期:2023-12-26
  • 通讯作者: 李宗杰
  • 作者简介:李宗杰(E-mail: lzjie314@163.com
    刘晓颖(1998—),女,河北秦皇岛人,硕士研究生,主要研究方向为寒旱区生态水文。E-mail: liuxy807@163.com
  • 基金资助:
    国家自然科学基金项目(42107063);第二次青藏高原综合科学考察研究专题项目(2019QZKK0405);中国科学院青年交叉团队项目(JCTD-2022-18);国家重点研发计划专题项目(2020YFA0607702);中国科学院“西部之光”交叉团队项目-重点实验室合作研究专项;甘肃省创新群体项目(20JR10RA038);甘肃省青年科技基金计划项目(20JR10RG824);兰州理工大学红柳优秀青年人才支持计划

Quantitative analysis of plant water sources in the Yangtze River source area

Xiaoying Liu1(), Zongjie Li1(), Mengqing Liu1, Bin Xu1, Juan Gui2, Qiao Cui2, Jian Xue2, Ran Duan1   

  1. 1.College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China
    2.Observation and Research Station of Eco-Hydrology and National Park by Stable Isotope Tracing in Alpine Region / Gansu Qilian Mountains Ecology Research Center / National Key Laboratory of Ecological Security and Sustainable Development in Arid Region,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2023-03-27 Revised:2023-04-28 Online:2024-01-20 Published:2023-12-26
  • Contact: Zongjie Li

摘要:

基于稳定同位素示踪技术对长江源区植物水、土壤水、降水、河水、冰雪融水、地下冰融水及冻土层上水等水体的氢(δ2H)、氧(δ18O)稳定同位素关系进行分析。通过对比22个植物样方的稳定同位素,发现草本的δ2H和δ18O稳定同位素值均比灌木偏正。从水体稳定同位素特征的分布情况来看,植物水的直接来源为不同深度土壤水,间接来源为河水、冻土层上水、冰雪融水、降水和地下冰融水。MixSIAR模型计算结果表明长江源区灌木主要利用40~60 cm (11.1%)和80~100 cm (11.1%)的土壤水,草本植物主要利用0~20 cm (13.0%)和20~40 cm (14.0%)的土壤水。土壤水对灌木的贡献比例为55%,对草本植物的贡献比例为62%,冰雪融水、降水、地下冰融水、河水、冻土层上水对灌木的贡献比例分别为7.6%、9.5%、11.1%、9.6%和7.6%,对草本植物的贡献比例分别为8.3%、8.2%、5.7%、7.1%和8.9%。

关键词: 长江源区, 植物水分来源, 同位素示踪技术, MixSIAR模型

Abstract:

The study explored the stable isotope data relationships of hydrogen (δ2H) and oxygen (δ18O) in different water bodies such as plant water, soil water, precipitation, river water, glacier snow meltwater, ground ice and supra-permafrost water in the Yangtze River source area based on stable isotope tracing techniques. By comparing the stable isotopes of 22 sample points, it was found that both δ2H and δ18O stable isotope values of herbs were enriched than those of shrubs, while the opposite was true for δ18O isotope values. The distribution of stable isotope characteristics of water bodies showed that the direct sources of plant water were soil water at different levels and indirect sources were river water, supra-permafrost water, ground ice, precipitation and glacier snow meltwater. The MixSIAR model was adopted to calculate the contributions of different water resources to plant water, and indicated that herbaceous plants in the Yangtze River source area primarily utilized soil water from 0-20 cm (13.0%) and 20-40 cm (14.0%), whereas shrubs primarily used soil water from 40-60 cm (11.1%) and 80-100 cm (11.1%). Shrubs received 7.6%, 9.5%, 11.1%, 9.6%, and 7.6% of the snow and ice melt, precipitation, subsurface ice melt, river water, and water on permafrost, respectively. Herbaceous plants received 8.3%, 8.2%, 5.7%, 7.1%, and 8.9% of these factors.

Key words: Yangtze River source area, plant water source, isotope tracing technique, MixSIAR model

中图分类号: