Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity
Abstract There is evidence that anthropogenic nitrogen (N) deposition enhances carbon (C) sequestration in boreal forest soils. However, it is unclear how free‐living saprotrophs (bacteria and fungi, SAP) and ectomycorrhizal (EM) fungi responses to N addition impact soil C dynamics. Our aim was to i...
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Online Access: | http://dx.doi.org/10.1111/gcb.14722 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.14722 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.14722 |
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crwiley:10.1111/gcb.14722 2024-09-15T18:26:13+00:00 Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity Maaroufi, Nadia I. Nordin, Annika Palmqvist, Kristin Hasselquist, Niles J. Forsmark, Benjamin Rosenstock, Nicholas P. Wallander, Håkan Gundale, Michael J. Svenska Forskningsrådet Formas 2019 http://dx.doi.org/10.1111/gcb.14722 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.14722 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.14722 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 25, issue 9, page 2900-2914 ISSN 1354-1013 1365-2486 journal-article 2019 crwiley https://doi.org/10.1111/gcb.14722 2024-08-09T04:24:35Z Abstract There is evidence that anthropogenic nitrogen (N) deposition enhances carbon (C) sequestration in boreal forest soils. However, it is unclear how free‐living saprotrophs (bacteria and fungi, SAP) and ectomycorrhizal (EM) fungi responses to N addition impact soil C dynamics. Our aim was to investigate how SAP and EM communities are impacted by N enrichment and to estimate whether these changes influence decay of litter and humus. We conducted a long‐term experiment in northern Sweden, maintained since 2004, consisting of ambient, low N additions (0, 3, 6, and 12 kg N ha −1 year −1 ) simulating current N deposition rates in the boreal region, as well as a high N addition (50 kg N ha −1 year −1 ). Our data showed that long‐term N enrichment impeded mass loss of litter, but not of humus, and only in response to the highest N addition treatment. Furthermore, our data showed that EM fungi reduced the mass of N and P in both substrates during the incubation period compared to when only SAP organisms were present. Low N additions had no effect on microbial community structure, while the high N addition decreased fungal and bacterial biomasses and altered EM fungi and SAP community composition. Actinomycetes were the only bacterial SAP to show increased biomass in response to the highest N addition. These results provide a mechanistic understanding of how anthropogenic N enrichment can influence soil C accumulation rates and suggest that current N deposition rates in the boreal region (≤12 kg N ha −1 year −1 ) are likely to have a minor impact on the soil microbial community and the decomposition of humus and litter. Article in Journal/Newspaper Northern Sweden Wiley Online Library Global Change Biology 25 9 2900 2914 |
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English |
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Abstract There is evidence that anthropogenic nitrogen (N) deposition enhances carbon (C) sequestration in boreal forest soils. However, it is unclear how free‐living saprotrophs (bacteria and fungi, SAP) and ectomycorrhizal (EM) fungi responses to N addition impact soil C dynamics. Our aim was to investigate how SAP and EM communities are impacted by N enrichment and to estimate whether these changes influence decay of litter and humus. We conducted a long‐term experiment in northern Sweden, maintained since 2004, consisting of ambient, low N additions (0, 3, 6, and 12 kg N ha −1 year −1 ) simulating current N deposition rates in the boreal region, as well as a high N addition (50 kg N ha −1 year −1 ). Our data showed that long‐term N enrichment impeded mass loss of litter, but not of humus, and only in response to the highest N addition treatment. Furthermore, our data showed that EM fungi reduced the mass of N and P in both substrates during the incubation period compared to when only SAP organisms were present. Low N additions had no effect on microbial community structure, while the high N addition decreased fungal and bacterial biomasses and altered EM fungi and SAP community composition. Actinomycetes were the only bacterial SAP to show increased biomass in response to the highest N addition. These results provide a mechanistic understanding of how anthropogenic N enrichment can influence soil C accumulation rates and suggest that current N deposition rates in the boreal region (≤12 kg N ha −1 year −1 ) are likely to have a minor impact on the soil microbial community and the decomposition of humus and litter. |
author2 |
Svenska Forskningsrådet Formas |
format |
Article in Journal/Newspaper |
author |
Maaroufi, Nadia I. Nordin, Annika Palmqvist, Kristin Hasselquist, Niles J. Forsmark, Benjamin Rosenstock, Nicholas P. Wallander, Håkan Gundale, Michael J. |
spellingShingle |
Maaroufi, Nadia I. Nordin, Annika Palmqvist, Kristin Hasselquist, Niles J. Forsmark, Benjamin Rosenstock, Nicholas P. Wallander, Håkan Gundale, Michael J. Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity |
author_facet |
Maaroufi, Nadia I. Nordin, Annika Palmqvist, Kristin Hasselquist, Niles J. Forsmark, Benjamin Rosenstock, Nicholas P. Wallander, Håkan Gundale, Michael J. |
author_sort |
Maaroufi, Nadia I. |
title |
Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity |
title_short |
Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity |
title_full |
Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity |
title_fullStr |
Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity |
title_full_unstemmed |
Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity |
title_sort |
anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/gcb.14722 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.14722 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.14722 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Global Change Biology volume 25, issue 9, page 2900-2914 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.14722 |
container_title |
Global Change Biology |
container_volume |
25 |
container_issue |
9 |
container_start_page |
2900 |
op_container_end_page |
2914 |
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1810466658780708864 |