Temperature sensitivity of peatland C and N cycling : does substrate supply play a role?
Abstract: Northern peatlands constitute an important component of the global carbon (C) cycle due to their long-term accumulation of soil organic matter. This function as a carbon sink is partly dependent on low temperatures limiting decomposition and nutrient cycling, so global warming has the pote...
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Language: | English |
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2013
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Online Access: | https://hdl.handle.net/10067/1070780151162165141 |
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ftunivantwerpen:c:irua:107078 2023-07-16T03:57:09+02:00 Temperature sensitivity of peatland C and N cycling : does substrate supply play a role? Weedon, James Aerts, Rien Kowalchuk, George A. van Logtestijn, Richard Andringa, Dave van Bodegom, Peter M. 2013 https://hdl.handle.net/10067/1070780151162165141 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/J.SOILBIO.2013.02.019 info:eu-repo/semantics/altIdentifier/isi/000318140300013 info:eu-repo/semantics/closedAccess 0038-0717 Soil biology and biochemistry Biology info:eu-repo/semantics/article 2013 ftunivantwerpen https://doi.org/10.1016/J.SOILBIO.2013.02.019 2023-06-26T22:16:38Z Abstract: Northern peatlands constitute an important component of the global carbon (C) cycle due to their long-term accumulation of soil organic matter. This function as a carbon sink is partly dependent on low temperatures limiting decomposition and nutrient cycling, so global warming has the potential to alter the C balance of these systems and feedback to climate change. Field observations have shown that peatland organic matter decomposition, ecosystem respiration and nitrogen cycling are closely related processes that show a large degree of temperature sensitivity. In the current study, we investigated whether seasonal dynamics of substrate input may be an indirect mechanism accounting for this observed sensitivity. We carried out a 60-day mesocosm incubation experiment with sub-arctic peat soil to compare the direct effects of temperature increase with the indirect effects of increased microbial- or plant-derived organic matter input on key soil C and N cycling processes and substrate pools. Additions of dead microbial cells led to an 83% increase in organic N pool sizes, 1664% increases in the potential activities of most soil enzymes, a transient increase in the relative abundance of β-proteobacteria, and a decrease in the relative abundance of α-proteo-, Actino- and Acido-bacteria. Neither the addition of plant root litter, nor a 5 °C alteration in incubation temperatures, had comparable effects on these parameters. Peat respiration was positively affected by both substrate addition (2046% increase) and higher incubation temperatures (3438% increase), but the temperature-only effect was not sufficient to account for the increases in respiration observed in field experiments. Thus, it appears that warming effects on C and N cycle processes can potentially be driven by indirect effects, with alterations to the seasonal flux of microbe-derived organic matter a particularly potent mechanism. The high temperature sensitivity of decomposition and respiration may therefore be largely a result of ... Article in Journal/Newspaper Arctic Climate change Global warming IRUA - Institutional Repository van de Universiteit Antwerpen Arctic Soil Biology and Biochemistry 61 109 120 |
institution |
Open Polar |
collection |
IRUA - Institutional Repository van de Universiteit Antwerpen |
op_collection_id |
ftunivantwerpen |
language |
English |
topic |
Biology |
spellingShingle |
Biology Weedon, James Aerts, Rien Kowalchuk, George A. van Logtestijn, Richard Andringa, Dave van Bodegom, Peter M. Temperature sensitivity of peatland C and N cycling : does substrate supply play a role? |
topic_facet |
Biology |
description |
Abstract: Northern peatlands constitute an important component of the global carbon (C) cycle due to their long-term accumulation of soil organic matter. This function as a carbon sink is partly dependent on low temperatures limiting decomposition and nutrient cycling, so global warming has the potential to alter the C balance of these systems and feedback to climate change. Field observations have shown that peatland organic matter decomposition, ecosystem respiration and nitrogen cycling are closely related processes that show a large degree of temperature sensitivity. In the current study, we investigated whether seasonal dynamics of substrate input may be an indirect mechanism accounting for this observed sensitivity. We carried out a 60-day mesocosm incubation experiment with sub-arctic peat soil to compare the direct effects of temperature increase with the indirect effects of increased microbial- or plant-derived organic matter input on key soil C and N cycling processes and substrate pools. Additions of dead microbial cells led to an 83% increase in organic N pool sizes, 1664% increases in the potential activities of most soil enzymes, a transient increase in the relative abundance of β-proteobacteria, and a decrease in the relative abundance of α-proteo-, Actino- and Acido-bacteria. Neither the addition of plant root litter, nor a 5 °C alteration in incubation temperatures, had comparable effects on these parameters. Peat respiration was positively affected by both substrate addition (2046% increase) and higher incubation temperatures (3438% increase), but the temperature-only effect was not sufficient to account for the increases in respiration observed in field experiments. Thus, it appears that warming effects on C and N cycle processes can potentially be driven by indirect effects, with alterations to the seasonal flux of microbe-derived organic matter a particularly potent mechanism. The high temperature sensitivity of decomposition and respiration may therefore be largely a result of ... |
format |
Article in Journal/Newspaper |
author |
Weedon, James Aerts, Rien Kowalchuk, George A. van Logtestijn, Richard Andringa, Dave van Bodegom, Peter M. |
author_facet |
Weedon, James Aerts, Rien Kowalchuk, George A. van Logtestijn, Richard Andringa, Dave van Bodegom, Peter M. |
author_sort |
Weedon, James |
title |
Temperature sensitivity of peatland C and N cycling : does substrate supply play a role? |
title_short |
Temperature sensitivity of peatland C and N cycling : does substrate supply play a role? |
title_full |
Temperature sensitivity of peatland C and N cycling : does substrate supply play a role? |
title_fullStr |
Temperature sensitivity of peatland C and N cycling : does substrate supply play a role? |
title_full_unstemmed |
Temperature sensitivity of peatland C and N cycling : does substrate supply play a role? |
title_sort |
temperature sensitivity of peatland c and n cycling : does substrate supply play a role? |
publishDate |
2013 |
url |
https://hdl.handle.net/10067/1070780151162165141 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Global warming |
genre_facet |
Arctic Climate change Global warming |
op_source |
0038-0717 Soil biology and biochemistry |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/J.SOILBIO.2013.02.019 info:eu-repo/semantics/altIdentifier/isi/000318140300013 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/J.SOILBIO.2013.02.019 |
container_title |
Soil Biology and Biochemistry |
container_volume |
61 |
container_start_page |
109 |
op_container_end_page |
120 |
_version_ |
1771543660204130304 |