MycorrhizaeV1, Main, Exploration, bibRecord, 000121

Isotopic constraints on plant nitrogen acquisition strategies during ecosystem retrogression.

Identifieur interne : 000121 ( Main/Exploration ); précédent : 000120; suivant : 000122

Isotopic constraints on plant nitrogen acquisition strategies during ecosystem retrogression.

Auteurs : Katherine A. Dynarski [États-Unis] ; Benjamin Z. Houlton [États-Unis]

Source :

Oecologia [ 1432-1939 ] ; 2020.

RBID : pubmed:32025895

Descripteurs français

KwdFr :
- Azote (MeSH), Mycorhizes (MeSH), Plantes (MeSH), Racines de plante (MeSH), Sol (MeSH), Écosystème (MeSH).
MESH :
- Azote, Mycorhizes, Plantes, Racines de plante, Sol, Écosystème.

English descriptors

KwdEn :
- Ecosystem (MeSH), Mycorrhizae (MeSH), Nitrogen (MeSH), Plant Roots (MeSH), Plants (MeSH), Soil (MeSH).
MESH :
- chemical : Nitrogen, Soil.
- Ecosystem, Mycorrhizae, Plant Roots, Plants.

Abstract

Plant root associations with microbes such as mycorrhizal fungi or N-fixing bacteria enable ecosystems to tap pools of nitrogen (N) that might otherwise be inaccessible, including atmospheric N or N in large soil organic molecules. Such microbially assisted N-foraging strategies may be particularly important in late-successional retrogressive ecosystems where productivity is low and soil nutrients are scarce. Here, we use natural N-stable isotopic composition to constrain pathways of N supplies to different plant functional groups across a well-studied natural soil fertility gradient that includes a highly retrogressive stage. We demonstrate that ectomycorrhizal fungi, ericoid mycorrhizal fungi, and N-fixing bacteria support forest N supplies at all stages of ecosystem succession, from relatively young, N-rich/phosphorus (P)-rich sites, to ancient sites (ca. 500 ky) where both N supplies and P supplies are exceedingly low. Microbially mediated N sources are most important in older ecosystems with very low soil nutrient availability, accounting for 75-96% of foliar N at the oldest, least fertile sites. These isotopically ground findings point to the key role of plant-microbe associations in shaping ecosystem processes and functioning, particularly in retrogressive-phase forest ecosystems.

DOI: 10.1007/s00442-020-04606-y
PubMed: 32025895

Affiliations:

États-Unis

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Le document en format XML

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<author><name sortKey="Dynarski, Katherine A" sort="Dynarski, Katherine A" uniqKey="Dynarski K" first="Katherine A" last="Dynarski">Katherine A. Dynarski</name>
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<author><name sortKey="Houlton, Benjamin Z" sort="Houlton, Benjamin Z" uniqKey="Houlton B" first="Benjamin Z" last="Houlton">Benjamin Z. Houlton</name>
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<series><title level="j">Oecologia</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ecosystem (MeSH)</term>
<term>Mycorrhizae (MeSH)</term>
<term>Nitrogen (MeSH)</term>
<term>Plant Roots (MeSH)</term>
<term>Plants (MeSH)</term>
<term>Soil (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Azote (MeSH)</term>
<term>Mycorhizes (MeSH)</term>
<term>Plantes (MeSH)</term>
<term>Racines de plante (MeSH)</term>
<term>Sol (MeSH)</term>
<term>Écosystème (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" xml:lang="en"><term>Nitrogen</term>
<term>Soil</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Ecosystem</term>
<term>Mycorrhizae</term>
<term>Plant Roots</term>
<term>Plants</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Azote</term>
<term>Mycorhizes</term>
<term>Plantes</term>
<term>Racines de plante</term>
<term>Sol</term>
<term>Écosystème</term>
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<front><div type="abstract" xml:lang="en">Plant root associations with microbes such as mycorrhizal fungi or N-fixing bacteria enable ecosystems to tap pools of nitrogen (N) that might otherwise be inaccessible, including atmospheric N or N in large soil organic molecules. Such microbially assisted N-foraging strategies may be particularly important in late-successional retrogressive ecosystems where productivity is low and soil nutrients are scarce. Here, we use natural N-stable isotopic composition to constrain pathways of N supplies to different plant functional groups across a well-studied natural soil fertility gradient that includes a highly retrogressive stage. We demonstrate that ectomycorrhizal fungi, ericoid mycorrhizal fungi, and N-fixing bacteria support forest N supplies at all stages of ecosystem succession, from relatively young, N-rich/phosphorus (P)-rich sites, to ancient sites (ca. 500 ky) where both N supplies and P supplies are exceedingly low. Microbially mediated N sources are most important in older ecosystems with very low soil nutrient availability, accounting for 75-96% of foliar N at the oldest, least fertile sites. These isotopically ground findings point to the key role of plant-microbe associations in shaping ecosystem processes and functioning, particularly in retrogressive-phase forest ecosystems.</div>
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<Title>Oecologia</Title>
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<ArticleTitle>Isotopic constraints on plant nitrogen acquisition strategies during ecosystem retrogression.</ArticleTitle>
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<Abstract><AbstractText>Plant root associations with microbes such as mycorrhizal fungi or N-fixing bacteria enable ecosystems to tap pools of nitrogen (N) that might otherwise be inaccessible, including atmospheric N or N in large soil organic molecules. Such microbially assisted N-foraging strategies may be particularly important in late-successional retrogressive ecosystems where productivity is low and soil nutrients are scarce. Here, we use natural N-stable isotopic composition to constrain pathways of N supplies to different plant functional groups across a well-studied natural soil fertility gradient that includes a highly retrogressive stage. We demonstrate that ectomycorrhizal fungi, ericoid mycorrhizal fungi, and N-fixing bacteria support forest N supplies at all stages of ecosystem succession, from relatively young, N-rich/phosphorus (P)-rich sites, to ancient sites (ca. 500 ky) where both N supplies and P supplies are exceedingly low. Microbially mediated N sources are most important in older ecosystems with very low soil nutrient availability, accounting for 75-96% of foliar N at the oldest, least fertile sites. These isotopically ground findings point to the key role of plant-microbe associations in shaping ecosystem processes and functioning, particularly in retrogressive-phase forest ecosystems.</AbstractText>
</Abstract>
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<Agency>National Science Foundation</Agency>
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Isotopic constraints on plant nitrogen acquisition strategies during ecosystem retrogression.

Isotopic constraints on plant nitrogen acquisition strategies during ecosystem retrogression.

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