长江源区植物水分来源的量化解析  

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

作　　者：刘晓颖 李宗杰 刘梦晴 徐斌 桂娟 崔乔 薛健 段然 Liu Xiaoying;Li Zongjie;Liu Mengqing;Xu Bin;Gui Juan;Cui Qiao;Xue Jian;Duan Ran(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;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 De-velopment in Arid Region,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lan-zhou 730000,China)

机构地区：[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

出　　处：《中国沙漠》2024年第1期102-110,共9页Journal of Desert Research

基　　金：国家自然科学基金项目(42107063,42077187);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);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;国家重点研发计划专题项目(2020YFA0607702);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。

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%。The study explored the stable isotope data relationships of hydrogen(δ2 H)and oxygen(δ18O)in dif-ferent 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 bothδ2 H andδ18O stable isotope values of herbs were enriched than those of shrubs,while the opposite was true forδ18O isotope values.The distribution of stable isotope characteristics of water bodies showed that the direct sources of plant water were soil water at dif-ferent 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.

关 键 词：长江源区 植物水分来源 同位素示踪技术 MixSIAR模型 

分 类 号：Q945.79[生物学—植物学]