MycorrhizaeV1, Main, Exploration, bibRecord, 000382

Resource-ratio theory predicts mycorrhizal control of litter decomposition.

Identifieur interne : 000382 ( Main/Exploration ); précédent : 000381; suivant : 000383

Resource-ratio theory predicts mycorrhizal control of litter decomposition.

Auteurs : Gabriel R. Smith [États-Unis] ; Joe Wan [Suisse]

Source :

The New phytologist [ 1469-8137 ] ; 2019.

RBID : pubmed:31066058

Descripteurs français

KwdFr :
- Azote (métabolisme), Carbone (métabolisme), Feuilles de plante (microbiologie), Lignine (métabolisme), Modèles biologiques (MeSH), Mycorhizes (physiologie), Simulation numérique (MeSH).
MESH :
- microbiologie : Feuilles de plante.
- métabolisme : Azote, Carbone, Lignine.
- physiologie : Mycorhizes.
- Modèles biologiques, Simulation numérique.

English descriptors

KwdEn :
- Carbon (metabolism), Computer Simulation (MeSH), Lignin (metabolism), Models, Biological (MeSH), Mycorrhizae (physiology), Nitrogen (metabolism), Plant Leaves (microbiology).
MESH :
- chemical , metabolism : Carbon, Lignin, Nitrogen.
- microbiology : Plant Leaves.
- physiology : Mycorrhizae.
- Computer Simulation, Models, Biological.

Abstract

Ecosystems with ectomycorrhizal plants have high soil carbon : nitrogen ratios, but it is not clear why. The Gadgil effect, where competition between ectomycorrhizal and saprotrophic fungi for nitrogen slows litter decomposition, may increase soil carbon. However, experimental evidence for the Gadgil effect is equivocal. Here, we apply resource-ratio theory to assess whether interguild fungal competition for different forms of organic nitrogen can affect litter decomposition. We focus on variation in resource input ratios and fungal resource use traits, and evaluate our model's predictions by synthesizing prior experimental literature examining ectomycorrhizal effects on litter decomposition. In our model, resource input ratios determined whether ectomycorrhizal fungi suppressed saprotrophic fungi. Recalcitrant litter inputs favored the former over the latter, allowing the Gadgil effect only when such inputs predominated. Although ectomycorrhizal fungi did not always hamper litter decomposition, ectomycorrhizal nitrogen uptake always increased carbon : nitrogen ratios in litter. Our meta-analysis of empirical studies supports our theoretical results: ectomycorrhizal fungi appear to slow decomposition of leaf litter only in forests where litter inputs are highly recalcitrant. We thus find that the specific contribution of the Gadgil effect to high soil carbon : nitrogen ratios in ectomycorrhizal ecosystems may be smaller than predicted previously.

DOI: 10.1111/nph.15884
PubMed: 31066058

Affiliations:

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Le document en format XML

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<term>Mycorrhizae (physiology)</term>
<term>Nitrogen (metabolism)</term>
<term>Plant Leaves (microbiology)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Azote (métabolisme)</term>
<term>Carbone (métabolisme)</term>
<term>Feuilles de plante (microbiologie)</term>
<term>Lignine (métabolisme)</term>
<term>Modèles biologiques (MeSH)</term>
<term>Mycorhizes (physiologie)</term>
<term>Simulation numérique (MeSH)</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon</term>
<term>Lignin</term>
<term>Nitrogen</term>
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<keywords scheme="MESH" qualifier="microbiologie" xml:lang="fr"><term>Feuilles de plante</term>
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<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Plant Leaves</term>
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<term>Carbone</term>
<term>Lignine</term>
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<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>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Computer Simulation</term>
<term>Models, Biological</term>
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<front><div type="abstract" xml:lang="en">Ecosystems with ectomycorrhizal plants have high soil carbon : nitrogen ratios, but it is not clear why. The Gadgil effect, where competition between ectomycorrhizal and saprotrophic fungi for nitrogen slows litter decomposition, may increase soil carbon. However, experimental evidence for the Gadgil effect is equivocal. Here, we apply resource-ratio theory to assess whether interguild fungal competition for different forms of organic nitrogen can affect litter decomposition. We focus on variation in resource input ratios and fungal resource use traits, and evaluate our model's predictions by synthesizing prior experimental literature examining ectomycorrhizal effects on litter decomposition. In our model, resource input ratios determined whether ectomycorrhizal fungi suppressed saprotrophic fungi. Recalcitrant litter inputs favored the former over the latter, allowing the Gadgil effect only when such inputs predominated. Although ectomycorrhizal fungi did not always hamper litter decomposition, ectomycorrhizal nitrogen uptake always increased carbon : nitrogen ratios in litter. Our meta-analysis of empirical studies supports our theoretical results: ectomycorrhizal fungi appear to slow decomposition of leaf litter only in forests where litter inputs are highly recalcitrant. We thus find that the specific contribution of the Gadgil effect to high soil carbon : nitrogen ratios in ectomycorrhizal ecosystems may be smaller than predicted previously.</div>
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<DateRevised><Year>2020</Year>
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<Abstract><AbstractText>Ecosystems with ectomycorrhizal plants have high soil carbon : nitrogen ratios, but it is not clear why. The Gadgil effect, where competition between ectomycorrhizal and saprotrophic fungi for nitrogen slows litter decomposition, may increase soil carbon. However, experimental evidence for the Gadgil effect is equivocal. Here, we apply resource-ratio theory to assess whether interguild fungal competition for different forms of organic nitrogen can affect litter decomposition. We focus on variation in resource input ratios and fungal resource use traits, and evaluate our model's predictions by synthesizing prior experimental literature examining ectomycorrhizal effects on litter decomposition. In our model, resource input ratios determined whether ectomycorrhizal fungi suppressed saprotrophic fungi. Recalcitrant litter inputs favored the former over the latter, allowing the Gadgil effect only when such inputs predominated. Although ectomycorrhizal fungi did not always hamper litter decomposition, ectomycorrhizal nitrogen uptake always increased carbon : nitrogen ratios in litter. Our meta-analysis of empirical studies supports our theoretical results: ectomycorrhizal fungi appear to slow decomposition of leaf litter only in forests where litter inputs are highly recalcitrant. We thus find that the specific contribution of the Gadgil effect to high soil carbon : nitrogen ratios in ectomycorrhizal ecosystems may be smaller than predicted previously.</AbstractText>
<CopyrightInformation>© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.</CopyrightInformation>
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Resource-ratio theory predicts mycorrhizal control of litter decomposition.

Resource-ratio theory predicts mycorrhizal control of litter decomposition.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki