Towards reliable measurements of trace gas fluxes at plant surfaces

Kohl, Leonie; Koskinen, Markku; Pihlatie, Mari

doi:10.1111/nph.17310

Cited by 2 publications

(6 citation statements)

References 12 publications

(14 reference statements)

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“…In response to the comments of Kohl et al . ( 2021 ) and the study of Kohl et al . ( 2019 ), we evaluated potential interference in the stem CH 4 measurements from 11 VOCs commonly occurring in tropical trees (Courtois et al ., 2012 ).…”

Section: Measurements Of Stem Ch 4 Fluxes On Volca...mentioning

confidence: 91%

“…This Letter responds to the comments of Kohl et al . ( 2021 ) regarding their concerns as to the reliability of methane (CH 4 ) concentration measurements from stems of tropical trees on volcanic Réunion Island measured by Fourier transform infrared (FTIR) spectroscopy. We acknowledge the points mentioned by Kohl et al .…”

Section: A Response To Kohl Et Al (2021) ‘Towards...mentioning

confidence: 99%

“…We acknowledge the points mentioned by Kohl et al . ( 2021 ) and use this Letter to discuss this topic. We first present the FTIR analyzer settings used during our study on Réunion (Machacova et al ., 2021 ), details on how CH 4 concentration data were measured and processed, and results of postprocessing interference analyses.…”

Section: A Response To Kohl Et Al (2021) ‘Towards...mentioning

confidence: 99%

“…Nevertheless, the slope of the CH 4 concentration changes over the duration of the stem chamber’s closure, and therefore of the slope calculated from that data for stem CH 4 fluxes of tropical trees on Réunion, seems to be much less affected by VOCs (on average by 3.5 ± 5.0%) than the 41% suggested by Kohl et al . ( 2019 , 2021 ). Moreover, the stem CH 4 fluxes measured on beech trees using the FTIR analyzer, even without considering potential VOC interference, were validated by the GC approach.…”

Section: Possible Reasons For the Lack Of Significant Discrepancies B...mentioning

confidence: 99%

“…Validation of data and correction for the potential interference should be applied, as proposed in Kohl et al . ( 2019 , 2021 ). Nevertheless, based on our current knowledge, our results and the inconsistencies identified in the study of Kohl et al .…”

Section: Possible Reasons For the Lack Of Significant Discrepancies B...mentioning

confidence: 99%

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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?

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Section: Measurements Of Stem Ch 4 Fluxes On Volca...mentioning

confidence: 91%

Section: A Response To Kohl Et Al (2021) ‘Towards...mentioning

confidence: 99%

Section: A Response To Kohl Et Al (2021) ‘Towards...mentioning

confidence: 99%

Section: Possible Reasons For the Lack Of Significant Discrepancies B...mentioning

confidence: 99%

Section: Possible Reasons For the Lack Of Significant Discrepancies B...mentioning

confidence: 99%

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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?

2021

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Radiation and temperature drive diurnal variation of aerobic methane emissions from Scots pine canopy

Kohl,

Tenhovirta,

Koskinen

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Methane emissions from plant foliage may play an important role in the global methane cycle, but their size and the underlying source processes remain poorly understood. Here, we quantify methane fluxes from the shoots of Scots pine trees, a dominant tree species in boreal forests, to identify source processes and environmental drivers, and we evaluate whether these fluxes can be constrained at the ecosystem-level by eddy covariance flux measurements. We show that shoot-level measurements conducted in forest, garden, or greenhouse settings; on mature trees and saplings; manually and with an automated CO 2 -, temperature-, and water-controlled chamber system; and with multiple methane analyzers all resulted in comparable daytime fluxes (0.144 ± 0.019 to 0.375 ± 0.074 nmol CH 4 g −1 foliar d.w. h −1 ). We further find that these emissions exhibit a pronounced diurnal cycle that closely follows photosynthetically active radiation and is further modulated by temperature. These diurnal patterns indicate that methane production is associated with diurnal cycle of sunlight, indicating that this production is either a byproduct of photosynthesis-associated biochemical reactions (e.g., the methionine cycle) or produced through nonenzymatic photochemical reactions in plant biomass. Moreover, we identified a light-dependent component in stand-level methane fluxes, which showed order-of-magnitude agreement with shoot-level measurements (0.968 ± 0.031 nmol CH 4 g −1 h −1 ) and which provides an upper limit for shoot methane emissions.

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Towards reliable measurements of trace gas fluxes at plant surfaces

Cited by 2 publications

References 12 publications

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?

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?

Radiation and temperature drive diurnal variation of aerobic methane emissions from Scots pine canopy

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Towards reliable measurements of trace gas fluxes at plant surfaces

Cited by 2 publications

References 12 publications

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?

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?

Radiation and temperature drive diurnal variation of aerobic methane emissions from Scots pine canopy

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Product

Resources

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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?

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?