The stable carbon isotope signature of methane produced by saprotrophic fungi
<p><strong>Abstract.</strong> Methane (CH<sub>4</sub>) is the most abundant organic compound in the atmosphere with emissions from many biotic and abiotic sources. Recent studies have shown that CH<sub>4</sub> production occurs under aerobic conditions in eu...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2 April 2020
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| In: |
Biogeosciences discussions
Year: 2020, Pages: 1-21 |
| ISSN: | 1810-6285 |
| DOI: | 10.5194/bg-2020-108 |
| Online Access: | lizenzpflichtig lizenzpflichtig 
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| Author Notes: | Moritz Schroll, Frank Keppler, Markus Greule, Christian Eckhardt, Holger Zorn, Katharina Lenhart |
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| 520 | |a <p><strong>Abstract.</strong> Methane (CH<sub>4</sub>) is the most abundant organic compound in the atmosphere with emissions from many biotic and abiotic sources. Recent studies have shown that CH<sub>4</sub> production occurs under aerobic conditions in eukaryotes such as plants, animals, algae and saprotrophic fungi. Saprotrophic fungi play an important role in nutrient recycling in terrestrial ecosystems by their ability to decompose plant litter. Even though the CH<sub>4</sub> production by saprotrophic fungi has been reported, so far, no data for stable carbon isotope values of the emitted CH4 (δ<sup>13</sup>C-CH<sub>4</sub> values) is available. In this study we measured the δ<sup>13</sup>C values of CH<sub>4</sub> and carbon dioxide (δ<sup>13</sup>C-CO<sub>2</sub> values) emitted by the two saprotrophic fungi Pleurotus sapidus and Laetiporus sulphureus cultivated on three different substrates pine wood, grass and corn, reflecting both C<sub>3</sub> and C<sub>4</sub> plants with distinguished bulk δ<sup>13</sup>C values. Applying keeling plots, we found that the δ<sup>13</sup>C source values of CH<sub>4</sub> emitted from fungi cover a wide range from −40 mUr to −69 mUr depending on the growth substrate and fungal species. Whilst little apparent carbon isotopic fractionation (in the range of −0.3 mUr to 4.6 mUr) was calculated for δ<sup>13</sup>C values of CO<sub>2</sub> released from P. sapidus and L. sulphureus relative to the bulk δ<sup>13</sup>C values of the growth substrates, much larger carbon isotopic fractionations (ranging from −22 mUr to −42 mUr) were observed for the formation of CH<sub>4</sub>. Whilst the two fungal species showed similar δ<sup>13</sup>CH<sub>4</sub> source values when grown on pine wood, δ<sup>13</sup>CH<sub>4</sub> source values differed substantially between the two fungal species when grown on grass or corn. We found that δ<sup>13</sup>CH<sub>4</sub> source values emitted by saprotrophic fungi are highly dependent on the fungal species and the metabolized substrate. They cover a broad range of δ<sup>13</sup>CH<sub>4</sub> values and overlap with values reported for methanogenic archaea, thermogenic degradation of organic matter and other eukaryotes.</p> | ||
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