Experimental evidence that mycorrhizal nitrogen strategies affect soil carbon.
Identifieur interne : 000D21 ( Main/Corpus ); précédent : 000D20; suivant : 000D22Experimental evidence that mycorrhizal nitrogen strategies affect soil carbon.
Auteurs : Nina Wurzburger ; E N Jack BrookshireSource :
- Ecology [ 0012-9658 ] ; 2017.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Carbon.
- chemical , chemistry : Soil.
- chemical , metabolism : Carbon, Nitrogen.
- physiology : Mycorrhizae.
- Plant Roots, Soil Microbiology.
Abstract
Most land plants acquire nitrogen (N) through associations with arbuscular (AM) and ectomycorrhizal (ECM) fungi, but these symbionts employ contrasting strategies for N acquisition, which may lead to different stocks of soil carbon (C). We experimentally test this hypothesis with a mesocosm system where AM and ECM tree seedling roots, or their hyphae only, could access mineral soils with 13 C- and 15 N-enriched organic matter. We quantified loss of soil C and N, plant uptake of N and new inputs of plant C to soil. We found that AM, but not ECM, seedlings reduced soil C relative to controls. Soil C loss was greater in the presence of roots relative to hyphae only for both AM and ECM seedlings, but was correlated with plant N uptake for AM seedlings only. While new plant C inputs stimulated soil C loss in both symbioses, we detected plant C inputs more frequently and measured higher rates of decomposer activity in soils colonized by AM relative to ECM seedlings. Our study experimentally demonstrates how mycorrhizal strategies for N can affect soil C and C:N, even at the scale of an individual plant. Such effects may contribute to broad patterns in soil C across terrestrial ecosystems.
DOI: 10.1002/ecy.1827
PubMed: 28369878
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We experimentally test this hypothesis with a mesocosm system where AM and ECM tree seedling roots, or their hyphae only, could access mineral soils with <sup>13</sup> C- and <sup>15</sup> N-enriched organic matter. We quantified loss of soil C and N, plant uptake of N and new inputs of plant C to soil. We found that AM, but not ECM, seedlings reduced soil C relative to controls. Soil C loss was greater in the presence of roots relative to hyphae only for both AM and ECM seedlings, but was correlated with plant N uptake for AM seedlings only. While new plant C inputs stimulated soil C loss in both symbioses, we detected plant C inputs more frequently and measured higher rates of decomposer activity in soils colonized by AM relative to ECM seedlings. Our study experimentally demonstrates how mycorrhizal strategies for N can affect soil C and C:N, even at the scale of an individual plant. Such effects may contribute to broad patterns in soil C across terrestrial ecosystems.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" IndexingMethod="Curated" Owner="NLM"><PMID Version="1">28369878</PMID><DateCompleted><Year>2018</Year><Month>11</Month><Day>06</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>06</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0012-9658</ISSN><JournalIssue CitedMedium="Print"><Volume>98</Volume><Issue>6</Issue><PubDate><Year>2017</Year><Month>Jun</Month></PubDate></JournalIssue><Title>Ecology</Title><ISOAbbreviation>Ecology</ISOAbbreviation></Journal><ArticleTitle>Experimental evidence that mycorrhizal nitrogen strategies affect soil carbon.</ArticleTitle><Pagination><MedlinePgn>1491-1497</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1002/ecy.1827</ELocationID><Abstract><AbstractText>Most land plants acquire nitrogen (N) through associations with arbuscular (AM) and ectomycorrhizal (ECM) fungi, but these symbionts employ contrasting strategies for N acquisition, which may lead to different stocks of soil carbon (C). We experimentally test this hypothesis with a mesocosm system where AM and ECM tree seedling roots, or their hyphae only, could access mineral soils with <sup>13</sup> C- and <sup>15</sup> N-enriched organic matter. We quantified loss of soil C and N, plant uptake of N and new inputs of plant C to soil. We found that AM, but not ECM, seedlings reduced soil C relative to controls. Soil C loss was greater in the presence of roots relative to hyphae only for both AM and ECM seedlings, but was correlated with plant N uptake for AM seedlings only. While new plant C inputs stimulated soil C loss in both symbioses, we detected plant C inputs more frequently and measured higher rates of decomposer activity in soils colonized by AM relative to ECM seedlings. Our study experimentally demonstrates how mycorrhizal strategies for N can affect soil C and C:N, even at the scale of an individual plant. 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