13C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study

Müller, Raphael; Maier, Andreas; Inselsbacher, Erich; Peticzka, Robert; Wang, Gang; Glatzel, Stephan

doi:10.3390/d14090735

Open AccessCommunication

¹³C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study

by

Raphael Müller

^1,2,*

,

Andreas Maier

¹,

Erich Inselsbacher

^1,3

,

Robert Peticzka

¹,

Gang Wang

^1,4

and

Stephan Glatzel

^1,2

¹

Department of Geography and Regional Research, Geoecology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, Austria

²

Vienna Doctoral School of Ecology and Evolution (VDSEE), Faculty of Life Sciences, University of Vienna, Djerassiplatz 1, 1030 Vienna, Austria

³

Department of Forest- and Soil Sciences, Institute of Soil Research, University of Natural Resources and Life Sciences, Peter-Jordan Straße 82, 1190 Vienna, Austria

⁴

Department of Agricultural Mechanization Engineering, College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China

^*

Author to whom correspondence should be addressed.

Diversity 2022, 14(9), 735; https://doi.org/10.3390/d14090735

Submission received: 12 August 2022 / Revised: 24 August 2022 / Accepted: 2 September 2022 / Published: 7 September 2022

(This article belongs to the Special Issue Peatland Ecosystems under Climate Change)

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Abstract

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

C O_{2}

and

C H_{4}

. 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

C O_{2}

, while

C H_{4}

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.

Keywords: root exudates; priming effect; peat; CO₂; CH₄; stable carbon isotopes; climate change; decomposition

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MDPI and ACS Style

Müller, R.; Maier, A.; Inselsbacher, E.; Peticzka, R.; Wang, G.; Glatzel, S. ¹³C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study. Diversity 2022, 14, 735. https://doi.org/10.3390/d14090735

AMA Style

Müller R, Maier A, Inselsbacher E, Peticzka R, Wang G, Glatzel S. ¹³C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study. Diversity. 2022; 14(9):735. https://doi.org/10.3390/d14090735

Chicago/Turabian Style

Müller, Raphael, Andreas Maier, Erich Inselsbacher, Robert Peticzka, Gang Wang, and Stephan Glatzel. 2022. "¹³C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study" Diversity 14, no. 9: 735. https://doi.org/10.3390/d14090735

APA Style

Müller, R., Maier, A., Inselsbacher, E., Peticzka, R., Wang, G., & Glatzel, S. (2022). ¹³C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study. Diversity, 14(9), 735. https://doi.org/10.3390/d14090735

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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¹³C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study

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