Experimental evidence that mycorrhizal nitrogen strategies affect soil carbon.
Identifieur interne : 000D63 ( Main/Exploration ); précédent : 000D62; suivant : 000D64Experimental evidence that mycorrhizal nitrogen strategies affect soil carbon.
Auteurs : Nina Wurzburger [États-Unis] ; E N Jack Brookshire [États-Unis]Source :
- Ecology [ 0012-9658 ] ; 2017.
Descripteurs français
- KwdFr :
- MESH :
- analyse : Carbone.
- composition chimique : Sol.
- métabolisme : Azote, Carbone.
- physiologie : Mycorhizes.
- Microbiologie du sol, Racines de plante.
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
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<affiliation wicri:level="1"><nlm:affiliation>Odum School of Ecology, University of Georgia, 140 East Green Street, Athens, Georgia, 30602, USA.</nlm:affiliation>
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<author><name sortKey="Brookshire, E N Jack" sort="Brookshire, E N Jack" uniqKey="Brookshire E" first="E N Jack" last="Brookshire">E N Jack Brookshire</name>
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<term>Carbon (metabolism)</term>
<term>Mycorrhizae (physiology)</term>
<term>Nitrogen (metabolism)</term>
<term>Plant Roots (MeSH)</term>
<term>Soil (chemistry)</term>
<term>Soil Microbiology (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Azote (métabolisme)</term>
<term>Carbone (analyse)</term>
<term>Carbone (métabolisme)</term>
<term>Microbiologie du sol (MeSH)</term>
<term>Mycorhizes (physiologie)</term>
<term>Racines de plante (MeSH)</term>
<term>Sol (composition chimique)</term>
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<keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Carbon</term>
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<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Soil</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon</term>
<term>Nitrogen</term>
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<term>Carbone</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Mycorhizes</term>
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<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Mycorrhizae</term>
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<keywords scheme="MESH" xml:lang="en"><term>Plant Roots</term>
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<front><div type="abstract" xml:lang="en">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. Such effects may contribute to broad patterns in soil C across terrestrial ecosystems.</div>
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<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. Such effects may contribute to broad patterns in soil C across terrestrial ecosystems.</AbstractText>
<CopyrightInformation>© 2017 by the Ecological Society of America.</CopyrightInformation>
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