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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (12): 4291-4300.doi: 10.13287/j.1001-9332.202012.024

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Applications of compound-specific isotope analysis in tree non-structural carbohydrates research: A review.

DIAO Hao-yu1,2, WANG An-zhi1, YUAN Feng-hui1, GUAN De-xin1, SUN Yu1, WU Jia-bing1*   

  1. 1CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-07-13 Accepted:2020-09-20 Published:2021-06-15
  • Contact: *E-mail: wujb@iae.ac.cn
  • Supported by:
    National Key R&D Program of China (2019YFC0409102) and the National Natural Science Foundation of China (31770755, 31870625).

Abstract: Compound-specific isotope analysis (CSIA) can precisely determine the carbon isotopic composition (δ13C) of specific compounds in a complex substrate. The δ13C values in tree non-structural carbohydrates (NSC) compounds, e.g. sugars, organic acids, and sugar alcohols, measured via CSIA could help tracing the newly assimilated photosynthate during carbon transfer and exchange with atmosphere. Further, they can act as sensitive indicators of the physiological response of trees to environmental change. In this review, we first systematically introduced the methods of CSIA with respect to sampling, purification, and analysis. Then, compound-specific δ13C difference among different NSCs and across tree carbon pools, as well as temporal pattern and mechanism underlying the variation of δ13C were described. Finally, we discussed the interaction between δ13C in tree NSCs, the main substrates of respiration, and respired CO213CR). Further studies on the post-photosynthetic discrimination, tree stress physiology, and tree-ring δ13C formation with the promising applications of CISA were suggested.

Key words: compound-specific isotope analysis, isotope fractionation, tree physiology, non-structural carbohydrates.