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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (10): 3753-3760.doi: 10.13287/j.1001-9332.202110.004

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Measurement and research status of stable hydrogen isotopes in tree-ring lignin methoxyl groups

WANG Ya-bo1, LIU Xiao-hong1,2,3*, LU Qiang-qiang1,4, ZENG Xiao-min1, ZHANG Ling-nan1, WANG Zi-yi1   

  1. 1School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China;
    2State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    3Qilian Mountain National Park Research Center (Qinghai), Xining 810008, China;
    4Key Laboratory of Soil Resource & Biotech Applications, Shaanxi Academy of Sciences, Xi'an Botanical Garden of Shaanxi Province (Institute of Botany of Shaanxi Province), Xi'an 710119, China
  • Received:2021-03-24 Revised:2021-04-26 Online:2021-10-15 Published:2022-04-15
  • Contact: * E-mail: xhliu@snnu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (41971104), the Fundamental Research Funds for the Central Universities (GK202007012), the State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy Sciences (SKLCS 2020-09), the Open Foundation of the State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy Sciences (SKLLQG1817), the Qilian Mountain National Park Research Center (Qinghai) (GKQ2019-01), and the Fundamental Research Funds for the Central Universities (TD2020034Y).

Abstract: The primary hydrogen (H) source for all organic compounds in the biosphere is from water, and then participates in biogeochemical cycles through photosynthesis and plant physiological metabolism. As a new proxy of paleoclimate and paleoenvironment, stable hydrogen isotope ratios in wood lignin methoxyl groups (δ2HLM) show great advantages in the studies of paleoclimatic change and have been used to reconstruct precipitation stable hydrogen isotope ratios and paleoclimate signals in many regions. Based on the lignin application mechanism and analysis method of δ2HLM, we evaluated the stability and effectiveness of δ2HLM-measurement method from lignin content and lignin monomer composition, and expounded the tree lignin methoxyl groups' stable isotope proxies of current research outcomes. In the middle latitudes, the tree-ring δ2HLM had great potential in recording temperature signals and precipitation stable hydrogen isotope ratios. However, the study of tree-ring δ2HLM was still in its infancy as evidenced by following reasons: 1) The study area was limited to the middle latitude of the northern hemisphere, and the study subjects were limited to conifer species; 2) To compensate for the limitation of hydrogen isotopic records of nitrocellulose, high resolution tree-ring δ2HLM would be studied; 3) The potential of tree-ring δ2HLM utilization in plant physiology and forest ecology remained to be exploited.

Key words: tree ring, δ2HLM, climate response, GC-IRMS