<sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study
Globally, peatlands have been recognized as important carbon sinks while only covering approximately 3% of the earth’s land surface. Root exudates are known key drivers of C cycling in soils and rhizosphere priming effects have been studied extensively in terrestrial ecosystems. Their role for decom...
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MDPI AG
2022-09-01
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| Online Access: | https://www.mdpi.com/1424-2818/14/9/735 |
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| author | Raphael Müller Andreas Maier Erich Inselsbacher Robert Peticzka Gang Wang Stephan Glatzel |
| author_facet | Raphael Müller Andreas Maier Erich Inselsbacher Robert Peticzka Gang Wang Stephan Glatzel |
| author_sort | Raphael Müller |
| collection | DOAJ |
| description | Globally, peatlands have been recognized as important carbon sinks while only covering approximately 3% of the earth’s land surface. Root exudates are known key drivers of C cycling in soils and rhizosphere priming effects have been studied extensively in terrestrial ecosystems. Their role for decomposition of peat still remains unclear, as little research about their fate and potential priming effects in peat exists. In this study, we aimed to evaluate pathways of root exudates and their short-term priming effects by daily determination of stable carbon isotope fluxes of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></mrow></semantics></math></inline-formula>. As the drainage of peatlands strongly alters processes of decomposition, we included measurements after drainage as well. Results revealed the immediate respiration of root exudates in peat, mainly as <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></semantics></math></inline-formula>, while <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></mrow></semantics></math></inline-formula> release was associated with a lag time of several days. However, the largest proportion of added root exudates remained in the solid and liquid phase of peat. In conclusion, our findings suggest that no priming occurred as added substrates remained immobile in peat. |
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| language | English |
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| spelling | doaj.art-8403af4f566e4d02a9f4f9d7965ed1072023-11-23T15:52:42ZengMDPI AGDiversity1424-28182022-09-0114973510.3390/d14090735<sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm StudyRaphael Müller0Andreas Maier1Erich Inselsbacher2Robert Peticzka3Gang Wang4Stephan Glatzel5Department of Geography and Regional Research, Geoecology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, AustriaDepartment of Geography and Regional Research, Geoecology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, AustriaDepartment of Geography and Regional Research, Geoecology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, AustriaDepartment of Geography and Regional Research, Geoecology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, AustriaDepartment of Geography and Regional Research, Geoecology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, AustriaDepartment of Geography and Regional Research, Geoecology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, AustriaGlobally, peatlands have been recognized as important carbon sinks while only covering approximately 3% of the earth’s land surface. Root exudates are known key drivers of C cycling in soils and rhizosphere priming effects have been studied extensively in terrestrial ecosystems. Their role for decomposition of peat still remains unclear, as little research about their fate and potential priming effects in peat exists. In this study, we aimed to evaluate pathways of root exudates and their short-term priming effects by daily determination of stable carbon isotope fluxes of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></mrow></semantics></math></inline-formula>. As the drainage of peatlands strongly alters processes of decomposition, we included measurements after drainage as well. Results revealed the immediate respiration of root exudates in peat, mainly as <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></semantics></math></inline-formula>, while <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></mrow></semantics></math></inline-formula> release was associated with a lag time of several days. However, the largest proportion of added root exudates remained in the solid and liquid phase of peat. In conclusion, our findings suggest that no priming occurred as added substrates remained immobile in peat.https://www.mdpi.com/1424-2818/14/9/735root exudatespriming effectpeat<i>CO</i><sub>2</sub><i>CH</i><sub>4</sub>stable carbon isotopes |
| spellingShingle | Raphael Müller Andreas Maier Erich Inselsbacher Robert Peticzka Gang Wang Stephan Glatzel <sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study Diversity root exudates priming effect peat <i>CO</i><sub>2</sub> <i>CH</i><sub>4</sub> stable carbon isotopes |
| title | <sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study |
| title_full | <sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study |
| title_fullStr | <sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study |
| title_full_unstemmed | <sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study |
| title_short | <sup>13</sup>C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study |
| title_sort | sup 13 sup c labeled artificial root exudates are immediately respired in a peat mesocosm study |
| topic | root exudates priming effect peat <i>CO</i><sub>2</sub> <i>CH</i><sub>4</sub> stable carbon isotopes |
| url | https://www.mdpi.com/1424-2818/14/9/735 |
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