Temperature sensitivity of peatland C and N cycling: Does substrate supply play a role?
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 a...
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2013
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ftknawnlpublic:oai:pure.knaw.nl:publications/366fb752-5a80-4af5-80ab-8ca847e2df89 2024-05-19T07:36:43+00:00 Temperature sensitivity of peatland C and N cycling: Does substrate supply play a role? Weedon, J.T. Aerts, R. Kowalchuk, G. A. Van Logtestijn, R. Andringa, D. Van Bodegom, P.M. 2013 https://pure.knaw.nl/portal/en/publications/366fb752-5a80-4af5-80ab-8ca847e2df89 https://doi.org/10.1016/j.soilbio.2013.02.019 https://hdl.handle.net/20.500.11755/366fb752-5a80-4af5-80ab-8ca847e2df89 eng eng https://pure.knaw.nl/portal/en/publications/366fb752-5a80-4af5-80ab-8ca847e2df89 info:eu-repo/semantics/closedAccess Weedon , J T , Aerts , R , Kowalchuk , G A , Van Logtestijn , R , Andringa , D & Van Bodegom , P M 2013 , ' Temperature sensitivity of peatland C and N cycling: Does substrate supply play a role? ' , Soil Biology & Biochemistry , vol. 61 , pp. 109-120 . https://doi.org/10.1016/j.soilbio.2013.02.019 national article 2013 ftknawnlpublic https://doi.org/10.1016/j.soilbio.2013.02.01920.500.11755/366fb752-5a80-4af5-80ab-8ca847e2df89 2024-05-01T23:56:50Z 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, 16–64% 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 (20–46% increase) and higher incubation temperatures (34–38% 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 warming-induced ... Article in Journal/Newspaper Arctic Climate change Global warming KNAW: Research Explorer (Royal Netherlands Academy of Arts and Sciences) Soil Biology and Biochemistry 61 109 120 |
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KNAW: Research Explorer (Royal Netherlands Academy of Arts and Sciences) |
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English |
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national Weedon, J.T. Aerts, R. Kowalchuk, G. A. Van Logtestijn, R. Andringa, D. Van Bodegom, P.M. Temperature sensitivity of peatland C and N cycling: Does substrate supply play a role? |
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national |
description |
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, 16–64% 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 (20–46% increase) and higher incubation temperatures (34–38% 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 warming-induced ... |
format |
Article in Journal/Newspaper |
author |
Weedon, J.T. Aerts, R. Kowalchuk, G. A. Van Logtestijn, R. Andringa, D. Van Bodegom, P.M. |
author_facet |
Weedon, J.T. Aerts, R. Kowalchuk, G. A. Van Logtestijn, R. Andringa, D. Van Bodegom, P.M. |
author_sort |
Weedon, J.T. |
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://pure.knaw.nl/portal/en/publications/366fb752-5a80-4af5-80ab-8ca847e2df89 https://doi.org/10.1016/j.soilbio.2013.02.019 https://hdl.handle.net/20.500.11755/366fb752-5a80-4af5-80ab-8ca847e2df89 |
genre |
Arctic Climate change Global warming |
genre_facet |
Arctic Climate change Global warming |
op_source |
Weedon , J T , Aerts , R , Kowalchuk , G A , Van Logtestijn , R , Andringa , D & Van Bodegom , P M 2013 , ' Temperature sensitivity of peatland C and N cycling: Does substrate supply play a role? ' , Soil Biology & Biochemistry , vol. 61 , pp. 109-120 . https://doi.org/10.1016/j.soilbio.2013.02.019 |
op_relation |
https://pure.knaw.nl/portal/en/publications/366fb752-5a80-4af5-80ab-8ca847e2df89 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.soilbio.2013.02.01920.500.11755/366fb752-5a80-4af5-80ab-8ca847e2df89 |
container_title |
Soil Biology and Biochemistry |
container_volume |
61 |
container_start_page |
109 |
op_container_end_page |
120 |
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1799475856459956224 |