Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity.
Identifieur interne : 000668 ( Main/Exploration ); précédent : 000667; suivant : 000669Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity.
Auteurs : Nadia I. Maaroufi [Suisse, Suède] ; Annika Nordin [Suède] ; Kristin Palmqvist [Suède] ; Niles J. Hasselquist [Suède] ; Benjamin Forsmark [Suède] ; Nicholas P. Rosenstock [Suède] ; H Kan Wallander [Suède] ; Michael J. Gundale [Suède]Source :
- Global change biology [ 1365-2486 ] ; 2019.
Descripteurs français
- KwdFr :
- MESH :
- Wicri :
- geographic : Suède.
English descriptors
- KwdEn :
- MESH :
- chemical : Carbon, Nitrogen, Soil.
- geographic : Sweden.
- Mycorrhizae, Soil Microbiology.
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.
DOI: 10.1111/gcb.14722
PubMed: 31166650
Affiliations:
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Maaroufi</name><affiliation wicri:level="4"><nlm:affiliation>Institute of Plant Sciences, University of Bern, Bern, Switzerland.</nlm:affiliation><country xml:lang="fr">Suisse</country><wicri:regionArea>Institute of Plant Sciences, University of Bern, Bern</wicri:regionArea><placeName><settlement type="city">Berne</settlement><region type="région" nuts="3">Canton de Berne</region></placeName><orgName type="university">Université de Berne</orgName></affiliation><affiliation wicri:level="1"><nlm:affiliation>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.</nlm:affiliation><country xml:lang="fr">Suède</country><wicri:regionArea>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå</wicri:regionArea><wicri:noRegion>Umeå</wicri:noRegion></affiliation><affiliation wicri:level="1"><nlm:affiliation>Department of Forest Mycology and Plant Pathology, BioCenter, Swedish University of Agricultural Sciences, Uppsala, Sweden.</nlm:affiliation><country xml:lang="fr">Suède</country><wicri:regionArea>Department of Forest Mycology and Plant Pathology, BioCenter, Swedish University of Agricultural Sciences, Uppsala</wicri:regionArea><wicri:noRegion>Uppsala</wicri:noRegion></affiliation></author><author><name sortKey="Nordin, Annika" sort="Nordin, Annika" uniqKey="Nordin A" first="Annika" last="Nordin">Annika Nordin</name><affiliation wicri:level="1"><nlm:affiliation>Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, Umeå, Sweden.</nlm:affiliation><country xml:lang="fr">Suède</country><wicri:regionArea>Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, Umeå</wicri:regionArea><wicri:noRegion>Umeå</wicri:noRegion></affiliation></author><author><name sortKey="Palmqvist, Kristin" sort="Palmqvist, Kristin" uniqKey="Palmqvist K" first="Kristin" last="Palmqvist">Kristin Palmqvist</name><affiliation wicri:level="1"><nlm:affiliation>Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.</nlm:affiliation><country xml:lang="fr">Suède</country><wicri:regionArea>Department of Ecology and Environmental Science, Umeå University, Umeå</wicri:regionArea><wicri:noRegion>Umeå</wicri:noRegion></affiliation></author><author><name sortKey="Hasselquist, Niles J" sort="Hasselquist, Niles J" uniqKey="Hasselquist N" first="Niles J" last="Hasselquist">Niles J. 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Rosenstock</name><affiliation wicri:level="1"><nlm:affiliation>Center for Environmental and Climate Research, Lund University, Lund, Sweden.</nlm:affiliation><country xml:lang="fr">Suède</country><wicri:regionArea>Center for Environmental and Climate Research, Lund University, Lund</wicri:regionArea><wicri:noRegion>Lund</wicri:noRegion></affiliation></author><author><name sortKey="Wallander, H Kan" sort="Wallander, H Kan" uniqKey="Wallander H" first="H Kan" last="Wallander">H Kan Wallander</name><affiliation wicri:level="1"><nlm:affiliation>Department of Microbial Ecology, Lund University, Lund, Sweden.</nlm:affiliation><country xml:lang="fr">Suède</country><wicri:regionArea>Department of Microbial Ecology, Lund University, Lund</wicri:regionArea><wicri:noRegion>Lund</wicri:noRegion></affiliation></author><author><name sortKey="Gundale, Michael J" sort="Gundale, Michael J" uniqKey="Gundale M" first="Michael J" last="Gundale">Michael J. Gundale</name><affiliation wicri:level="1"><nlm:affiliation>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.</nlm:affiliation><country xml:lang="fr">Suède</country><wicri:regionArea>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå</wicri:regionArea><wicri:noRegion>Umeå</wicri:noRegion></affiliation></author></analytic><series><title level="j">Global change biology</title><idno type="eISSN">1365-2486</idno><imprint><date when="2019" type="published">2019</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carbon (MeSH)</term><term>Mycorrhizae (MeSH)</term><term>Nitrogen (MeSH)</term><term>Soil (MeSH)</term><term>Soil Microbiology (MeSH)</term><term>Sweden (MeSH)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Azote (MeSH)</term><term>Carbone (MeSH)</term><term>Microbiologie du sol (MeSH)</term><term>Mycorhizes (MeSH)</term><term>Sol (MeSH)</term><term>Suède (MeSH)</term></keywords><keywords scheme="MESH" type="chemical" xml:lang="en"><term>Carbon</term><term>Nitrogen</term><term>Soil</term></keywords><keywords scheme="MESH" type="geographic" xml:lang="en"><term>Sweden</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Mycorrhizae</term><term>Soil Microbiology</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Azote</term><term>Carbone</term><term>Microbiologie du sol</term><term>Mycorhizes</term><term>Sol</term><term>Suède</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Suède</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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<sup>-1</sup> year<sup>-1</sup> ) simulating current N deposition rates in the boreal region, as well as a high N addition (50 kg N ha<sup>-1</sup> year<sup>-1</sup> ). 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<sup>-1</sup> year<sup>-1</sup> ) are likely to have a minor impact on the soil microbial community and the decomposition of humus and litter.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" IndexingMethod="Automated" Owner="NLM"><PMID Version="1">31166650</PMID><DateCompleted><Year>2019</Year><Month>10</Month><Day>11</Day></DateCompleted><DateRevised><Year>2019</Year><Month>10</Month><Day>11</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1365-2486</ISSN><JournalIssue CitedMedium="Internet"><Volume>25</Volume><Issue>9</Issue><PubDate><Year>2019</Year><Month>09</Month></PubDate></JournalIssue><Title>Global change biology</Title><ISOAbbreviation>Glob Chang Biol</ISOAbbreviation></Journal><ArticleTitle>Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity.</ArticleTitle><Pagination><MedlinePgn>2900-2914</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/gcb.14722</ELocationID><Abstract><AbstractText>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<sup>-1</sup> year<sup>-1</sup> ) simulating current N deposition rates in the boreal region, as well as a high N addition (50 kg N ha<sup>-1</sup> year<sup>-1</sup> ). 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<sup>-1</sup> year<sup>-1</sup> ) are likely to have a minor impact on the soil microbial community and the decomposition of humus and litter.</AbstractText><CopyrightInformation>© 2019 John Wiley & Sons Ltd.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Maaroufi</LastName><ForeName>Nadia I</ForeName><Initials>NI</Initials><Identifier Source="ORCID">0000-0002-8028-1409</Identifier><AffiliationInfo><Affiliation>Institute of Plant Sciences, University of Bern, Bern, Switzerland.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Department of Forest Mycology and Plant Pathology, BioCenter, Swedish University of Agricultural Sciences, Uppsala, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Nordin</LastName><ForeName>Annika</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, Umeå, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Palmqvist</LastName><ForeName>Kristin</ForeName><Initials>K</Initials><AffiliationInfo><Affiliation>Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hasselquist</LastName><ForeName>Niles J</ForeName><Initials>NJ</Initials><AffiliationInfo><Affiliation>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Forsmark</LastName><ForeName>Benjamin</ForeName><Initials>B</Initials><Identifier Source="ORCID">0000-0002-1225-1128</Identifier><AffiliationInfo><Affiliation>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Rosenstock</LastName><ForeName>Nicholas P</ForeName><Initials>NP</Initials><AffiliationInfo><Affiliation>Center for Environmental and Climate Research, Lund University, Lund, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Wallander</LastName><ForeName>Håkan</ForeName><Initials>H</Initials><AffiliationInfo><Affiliation>Department of Microbial Ecology, Lund University, Lund, Sweden.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Gundale</LastName><ForeName>Michael J</ForeName><Initials>MJ</Initials><AffiliationInfo><Affiliation>Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2019</Year><Month>07</Month><Day>10</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>Glob Chang Biol</MedlineTA><NlmUniqueID>9888746</NlmUniqueID><ISSNLinking>1354-1013</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D012987">Soil</NameOfSubstance></Chemical><Chemical><RegistryNumber>7440-44-0</RegistryNumber><NameOfSubstance UI="D002244">Carbon</NameOfSubstance></Chemical><Chemical><RegistryNumber>N762921K75</RegistryNumber><NameOfSubstance UI="D009584">Nitrogen</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D002244" MajorTopicYN="N">Carbon</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D038821" MajorTopicYN="Y">Mycorrhizae</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D009584" MajorTopicYN="Y">Nitrogen</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D012987" MajorTopicYN="N">Soil</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D012988" MajorTopicYN="N">Soil Microbiology</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D013548" MajorTopicYN="N" Type="Geographic">Sweden</DescriptorName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="Y">Gadgil effect</Keyword><Keyword MajorTopicYN="Y">ITS amplicons</Keyword><Keyword MajorTopicYN="Y">carbon sequestration</Keyword><Keyword MajorTopicYN="Y">ecological stoichiometry</Keyword><Keyword MajorTopicYN="Y">high-throughput sequencing</Keyword><Keyword MajorTopicYN="Y">ingrowth mesh bags</Keyword><Keyword MajorTopicYN="Y">litter decomposition</Keyword><Keyword MajorTopicYN="Y">root exclosure</Keyword><Keyword MajorTopicYN="Y">soil organic matter</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2018</Year><Month>12</Month><Day>13</Day></PubMedPubDate><PubMedPubDate PubStatus="revised"><Year>2019</Year><Month>05</Month><Day>10</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2019</Year><Month>05</Month><Day>20</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2019</Year><Month>6</Month><Day>6</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2019</Year><Month>10</Month><Day>12</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2019</Year><Month>6</Month><Day>6</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">31166650</ArticleId><ArticleId IdType="doi">10.1111/gcb.14722</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Suisse</li><li>Suède</li></country><region><li>Canton de Berne</li></region><settlement><li>Berne</li></settlement><orgName><li>Université de Berne</li></orgName></list><tree><country name="Suisse"><region name="Canton de Berne"><name sortKey="Maaroufi, Nadia I" sort="Maaroufi, Nadia I" uniqKey="Maaroufi N" first="Nadia I" last="Maaroufi">Nadia I. Maaroufi</name></region></country><country name="Suède"><noRegion><name sortKey="Maaroufi, Nadia I" sort="Maaroufi, Nadia I" uniqKey="Maaroufi N" first="Nadia I" last="Maaroufi">Nadia I. Maaroufi</name></noRegion><name sortKey="Forsmark, Benjamin" sort="Forsmark, Benjamin" uniqKey="Forsmark B" first="Benjamin" last="Forsmark">Benjamin Forsmark</name><name sortKey="Gundale, Michael J" sort="Gundale, Michael J" uniqKey="Gundale M" first="Michael J" last="Gundale">Michael J. Gundale</name><name sortKey="Hasselquist, Niles J" sort="Hasselquist, Niles J" uniqKey="Hasselquist N" first="Niles J" last="Hasselquist">Niles J. Hasselquist</name><name sortKey="Maaroufi, Nadia I" sort="Maaroufi, Nadia I" uniqKey="Maaroufi N" first="Nadia I" last="Maaroufi">Nadia I. Maaroufi</name><name sortKey="Nordin, Annika" sort="Nordin, Annika" uniqKey="Nordin A" first="Annika" last="Nordin">Annika Nordin</name><name sortKey="Palmqvist, Kristin" sort="Palmqvist, Kristin" uniqKey="Palmqvist K" first="Kristin" last="Palmqvist">Kristin Palmqvist</name><name sortKey="Rosenstock, Nicholas P" sort="Rosenstock, Nicholas P" uniqKey="Rosenstock N" first="Nicholas P" last="Rosenstock">Nicholas P. Rosenstock</name><name sortKey="Wallander, H Kan" sort="Wallander, H Kan" uniqKey="Wallander H" first="H Kan" last="Wallander">H Kan Wallander</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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