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?

Substantial uptake of nitrous oxide (N2O) by shoots of mature European beech

“…For an example of the quality checks, please see Supporting Information Note S1. Moreover, intercomparison measurements of N2O fluxes from mature beech stems using an FTIR analyser (DX-4040, same settings as the DX-4015 analyser used in this study; Gasmet Technologies Oy, Finland) and a gas chromatography analyser (GC; Tracera, Shimadzu Corporation, Kyoto, Japan) were in close agreement and showed no significant discrepancy between these detection techniques for the stem N2O uptake (Machacova et al, 2021b).…”

“…The quality of the measured N2O concentrations was continuously monitored during the real-time measurements by evaluating the residual values and graphs for each spectra measurement (Gasmet, 2015). The quality checks revealed no significant instrumental biases in N2O concentration measurements caused by potential interference from volatile organic compounds, potentially emitted from tree stems and shoots (Machacova et al, 2021b). For an example of the quality checks, please see Supporting Information Note S1.…”

Methane emissions from tree stems – current knowledge and challenges: an introduction to a Virtual Issue

“…Under certain circumstances, stem oxidation may even dominate the stem fluxes so much that tree stems become net sinks of CH 4 (Machacova et al ., 2021a). However, further investigation is needed to determine how widespread stem methanotrophy is (Covey & Megonigal, 2019), or how the interference with other gases and volatile organic compounds could affect uptake measurements (Kohl et al ., 2019; Machacova et al ., 2021b).…”