Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity
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 investigat...
Published in: | Global Change Biology |
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Wiley-Blackwell
2019
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Online Access: | https://lup.lub.lu.se/record/5d9270ac-9ad9-40ba-8f74-9b4b65b78306 https://doi.org/10.1111/gcb.14722 |
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ftulundlup:oai:lup.lub.lu.se:5d9270ac-9ad9-40ba-8f74-9b4b65b78306 2024-04-28T08:32:41+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. 2019-06-05 https://lup.lub.lu.se/record/5d9270ac-9ad9-40ba-8f74-9b4b65b78306 https://doi.org/10.1111/gcb.14722 eng eng Wiley-Blackwell https://lup.lub.lu.se/record/5d9270ac-9ad9-40ba-8f74-9b4b65b78306 http://dx.doi.org/10.1111/gcb.14722 scopus:85068798269 pmid:31166650 Global Change Biology; 25(9), pp 2900-2914 (2019) ISSN: 1354-1013 Soil Science carbon sequestration ecological stoichiometry Gadgil effect high-throughput sequencing ingrowth mesh bags ITS amplicons litter decomposition root exclosure soil organic matter contributiontojournal/article info:eu-repo/semantics/article text 2019 ftulundlup https://doi.org/10.1111/gcb.14722 2024-04-03T14:04:55Z 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 Lund University Publications (LUP) Global Change Biology 25 9 2900 2914 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Soil Science carbon sequestration ecological stoichiometry Gadgil effect high-throughput sequencing ingrowth mesh bags ITS amplicons litter decomposition root exclosure soil organic matter |
spellingShingle |
Soil Science carbon sequestration ecological stoichiometry Gadgil effect high-throughput sequencing ingrowth mesh bags ITS amplicons litter decomposition root exclosure soil organic matter 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 |
topic_facet |
Soil Science carbon sequestration ecological stoichiometry Gadgil effect high-throughput sequencing ingrowth mesh bags ITS amplicons litter decomposition root exclosure soil organic matter |
description |
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. |
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. |
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-Blackwell |
publishDate |
2019 |
url |
https://lup.lub.lu.se/record/5d9270ac-9ad9-40ba-8f74-9b4b65b78306 https://doi.org/10.1111/gcb.14722 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Global Change Biology; 25(9), pp 2900-2914 (2019) ISSN: 1354-1013 |
op_relation |
https://lup.lub.lu.se/record/5d9270ac-9ad9-40ba-8f74-9b4b65b78306 http://dx.doi.org/10.1111/gcb.14722 scopus:85068798269 pmid:31166650 |
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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1797589780859453440 |