Fourier transform infrared spectroscopy and interference of volatile organic compounds on measurements of methane (CH4) fluxes at tree stems a general phenomenon for plant systems?

0543382 - ÚVGZ 2022 RIV GB eng J - Journal Article
Macháčová, Kateřina - Schindler, Thomas - Soosaar, Kaido
Fourier transform infrared spectroscopy and interference of volatile organic compounds on measurements of methane (CH4) fluxes at tree stems a general phenomenon for plant systems?
New Phytologist. Roč. 230, č. 6 (2021), s. 2100-2104. ISSN 0028-646X. E-ISSN 1469-8137
R&D Projects: GA MŠMT(CZ) EF16_019/0000797; GA ČR(CZ) GJ17-18112Y
Research Infrastructure: CzeCOS III - 90123
Institutional support: RVO:86652079
Keywords : nitrous-oxide * monoterpenes * emissions * vocs * n2o * ftir * gas chromatograph * greenhouse gas * interference * methane (CH4) flux * nitrous oxide flux * tree stem gas exchange * volatile organic compound (VOCs)
OECD category: Plant sciences, botany
Impact factor: 10.323, year: 2021
Method of publishing: Open access
https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.17311

This Letter responds to the comments of Kohl et al. (2021) regarding the reliability of methane (CH4) fluxes from tropical trees on Réunion as measured by Fourier transform infrared (FTIR) spectroscopy. • We evaluated potential interference of 11 volatile organic compounds (VOCs) commonly occurring in tropical trees on CH4 concentrations in stem chambers on Réunion. The potential interference-corrected stem CH4 uptake (−15.1 ± 1.9 μg−CH4 m−2 h−1) did not differ significantly from the initially reported flux (−15.6 ± 2.0 μg−CH4 m−2 h−1). The stem CH4 flux measurements on Réunion seem to be reliable. • We further present experimental results comparing FTIR and gas chromatographic approaches for CH4 (and nitrous oxide) flux measurements in beech stems. • We revealed no substantial discrepancies in tree stem CH4 fluxes when measured by FTIR analyzer, as stated by Kohl et al. (2019). • Based upon our knowledge, the analyses performed, and inconsistencies identified in Kohl et al. (2019), we recognize that elevated VOC concentrations can interfere with CH4 concentration measurements when using FTIR technology. Under natural field conditions, however, such interference seems to be less significant than proposed by Kohl et al. (2019, 2021). Such interference is highly species-dependent and cannot be generalized for all ecosystems worldwide.
Permanent Link: http://hdl.handle.net/11104/0320596