Altitude-specific differences in tree-ring δ2H records of wood lignin methoxy in the Qinling mountains, central China

Lu, Qingtao; Liu, Xiaohong; Treydte, Kerstin; Greule, Markus; Wieland, Anna; Liu, Jinzhao; Zhao, Liang; Yu, Zhongbo; Kang, Huhu; Zhang, Lingnan; Zeng, Xiaomin; Keppler, Frank; Chen, Zhikun; Xing, Xiaoyan

doi:10.1016/j.quascirev.2022.107895

Cited by 2 publications

(1 citation statement)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, applying IRMS for site-specific determination of carbon isotope ratios of the methoxy group in a given molecule is also possible, and this offers a means to validate the 13 C-qNMR measurements. For this, one can employ the Zeisel method which cleaves methoxy groups from the target molecule by forming iodomethane (CH 3 I). − This method has been demonstrated for a broad range of plant-based materials including wood and leaves, − lignins or pectins, , and specific molecules such as polygalacturonic acid or vanillin. , In this context, plant methoxy groups have been shown to have distinct carbon isotopic patterns that are often significantly depleted in 13 C relative to that of the bulk biomass or the whole molecule. Thus, measurements of the stable carbon isotopes of methoxy groups have great potential, for example, for paleoclimate studies, ,− to determine the origin of coal bed methane , or to study the freshness of fruits and vegetables, authenticity of vanillin ,, and biomethylation processes .…”

Section: Introductionmentioning

confidence: 99%

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and ¹³C-qNMR

Greule,

Le,

Meija

et al. 2023

J. Am. Soc. Mass Spectrom.

Self Cite

View full text Add to dashboard Cite

Site-specific carbon isotope ratio measurements by quantitative 13 C NMR ( 13 C-qNMR), Orbitrap-MS, and GC-IRMS offer a new dimension to conventional bulk carbon isotope ratio measurements used in food provenance, forensics, and a number of other applications. While the site-specific measurements of carbon isotope ratios in vanillin by 13 C-qNMR or Orbitrap-MS are powerful new tools in food analysis, there are a limited number of studies regarding the validity of these measurement results. Here we present carbon site-specific measurements of vanillin by GC-IRMS and 13 C-qNMR for methoxy carbon. Carbon isotope delta (δ 13 C) values obtained by these different measurement approaches demonstrate remarkable agreement; in five vanillin samples whose bulk δ 13 C values ranged from −31‰ to −26‰, their δ 13 C values of the methoxy carbon ranged from −62.4‰ to −30.6‰, yet the difference between the results of the two analytical approaches was within ±0.6‰. While the GC-IRMS approach afforded up to 9-fold lower uncertainties and required 100-fold less sample compared to the 13 C-qNMR, the 13 C-qNMR is able to assign δ 13 C values to all carbon atoms in the molecule, not just the cleavable methoxy group.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and ¹³C-qNMR

Greule,

Le,

Meija

et al. 2023

J. Am. Soc. Mass Spectrom.

Self Cite

View full text Add to dashboard Cite

show abstract

Weakened relationship between tree growth and nitrogen availability due to global CO2 increase and warming in the Taibai Mountain timberline, central China

Yin,

Liu,

Zeng

et al. 2024

Journal of Plant Ecology

View full text Add to dashboard Cite

Climate warming, rising atmospheric CO2 concentration (Ca) and nitrogen (N) availability are exerting profound impacts on global forest ecosystems, particularly in high-altitude mountains. This study investigated the tree-growth dynamics of timberline Larix chinensis in the Taibai Mountain, central China, to explore its ecophysiological responses to environmental stresses by combining tree growth and stable isotopes. The results indicated that the growth rate of L. chinensis has significantly increased since the 1960s, and that tree growth in this timberline was particularly sensitive to temperature in spring. Moreover, the continuously rising iWUE, linked to higher Ca and warmer environment, promoted the growth of L. chinensis. Before the 1960s, tree-ring δ15N gradually increased, then shifted to an insignificant decline with the acceleration of tree growth, and broke the pre-existing carbon-nitrogen balance. Meanwhile, climate warming and increased iWUE have replaced N as the principal drivers of tree growth since the 1960s. It is believed that L. chinensis may gradually suffer a decline in nitrogen availability as it continues to grow rapidly. The insightful understanding of the biochemical mechanisms of plant responses to growth-related environmental conditions will improve our ability to predict the evolution of high-elevation mountain ecosystems in the future.

show abstract

Altitude-specific differences in tree-ring δ2H records of wood lignin methoxy in the Qinling mountains, central China

Cited by 2 publications

References 74 publications

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and ¹³C-qNMR

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and ¹³C-qNMR

Weakened relationship between tree growth and nitrogen availability due to global CO2 increase and warming in the Taibai Mountain timberline, central China

Contact Info

Product

Resources

About

Altitude-specific differences in tree-ring δ2H records of wood lignin methoxy in the Qinling mountains, central China

Cited by 2 publications

References 74 publications

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and 13C-qNMR

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and 13C-qNMR

Weakened relationship between tree growth and nitrogen availability due to global CO2 increase and warming in the Taibai Mountain timberline, central China

Contact Info

Product

Resources

About

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and ¹³C-qNMR

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and ¹³C-qNMR