MycorrhizaeV1, Main, Exploration, bibRecord, 001472

Natural abundance (δ¹⁵N) indicates shifts in nitrogen relations of woody taxa along a savanna-woodland continental rainfall gradient.

Identifieur interne : 001472 ( Main/Exploration ); précédent : 001471; suivant : 001473

Natural abundance (δ¹⁵N) indicates shifts in nitrogen relations of woody taxa along a savanna-woodland continental rainfall gradient.

Auteurs : Fiona M. Soper [États-Unis] ; Anna E. Richards ; Ilyas Siddique ; Marcos P M. Aidar ; Garry D. Cook ; Lindsay B. Hutley ; Nicole Robinson ; Susanne Schmidt

Source :

Oecologia [ 1432-1939 ] ; 2015.

RBID : pubmed:25502440

Descripteurs français

KwdFr :
- Acacia (croissance et développement), Acacia (métabolisme), Arbres (MeSH), Australie (MeSH), Azote (métabolisme), Bois (métabolisme), Cycle de l'azote (MeSH), Eau (MeSH), Eucalyptus (croissance et développement), Eucalyptus (métabolisme), Feuilles de plante (métabolisme), Fixation de l'azote (MeSH), Forêts (MeSH), Isotopes de l'azote (métabolisme), Mycorhizes (MeSH), Plantes (métabolisme), Pluie (MeSH), Prairie (MeSH), Racines de plante (métabolisme), Sol (MeSH), Sécheresses (MeSH), Xylème (métabolisme), Écosystème (MeSH).
MESH :
- croissance et développement : Acacia, Eucalyptus.
- métabolisme : Acacia, Azote, Bois, Eucalyptus, Feuilles de plante, Isotopes de l'azote, Plantes, Racines de plante, Xylème.
- Arbres, Australie, Cycle de l'azote, Eau, Fixation de l'azote, Forêts, Mycorhizes, Pluie, Prairie, Sol, Sécheresses, Écosystème.

English descriptors

KwdEn :
- Acacia (growth & development), Acacia (metabolism), Australia (MeSH), Droughts (MeSH), Ecosystem (MeSH), Eucalyptus (growth & development), Eucalyptus (metabolism), Forests (MeSH), Grassland (MeSH), Mycorrhizae (MeSH), Nitrogen (metabolism), Nitrogen Cycle (MeSH), Nitrogen Fixation (MeSH), Nitrogen Isotopes (metabolism), Plant Leaves (metabolism), Plant Roots (metabolism), Plants (metabolism), Rain (MeSH), Soil (MeSH), Trees (MeSH), Water (MeSH), Wood (metabolism), Xylem (metabolism).
MESH :
- chemical , metabolism : Nitrogen, Nitrogen Isotopes.
- growth & development : Acacia, Eucalyptus.
- metabolism : Acacia, Eucalyptus, Plant Leaves, Plant Roots, Plants, Wood, Xylem.
- Australia, Droughts, Ecosystem, Forests, Grassland, Mycorrhizae, Nitrogen Cycle, Nitrogen Fixation, Rain, Soil, Trees, Water.

Abstract

Water and nitrogen (N) interact to influence soil N cycling and plant N acquisition. We studied indices of soil N availability and acquisition by woody plant taxa with distinct nutritional specialisations along a north Australian rainfall gradient from monsoonal savanna (1,600-1,300 mm annual rainfall) to semi-arid woodland (600-250 mm). Aridity resulted in increased 'openness' of N cycling, indicated by increasing δ(15)N(soil) and nitrate:ammonium ratios, as plant communities transitioned from N to water limitation. In this context, we tested the hypothesis that δ(15)N(root) xylem sap provides a more direct measure of plant N acquisition than δ(15)N(foliage). We found highly variable offsets between δ(15)N(foliage) and δ(15)N(root) xylem sap, both between taxa at a single site (1.3-3.4 ‰) and within taxa across sites (0.8-3.4 ‰). As a result, δ(15)N(foliage) overlapped between N-fixing Acacia and non-fixing Eucalyptus/Corymbia and could not be used to reliably identify biological N fixation (BNF). However, Acacia δ(15)N(root) xylem sap indicated a decline in BNF with aridity corroborated by absence of root nodules and increasing xylem sap nitrate concentrations and consistent with shifting resource limitation. Acacia dominance at arid sites may be attributed to flexibility in N acquisition rather than BNF capacity. δ(15)N(root) xylem sap showed no evidence of shifting N acquisition in non-mycorrhizal Hakea/Grevillea and indicated only minor shifts in Eucalyptus/Corymbia consistent with enrichment of δ(15)N(soil) and/or decreasing mycorrhizal colonisation with aridity. We propose that δ(15)N(root) xylem sap is a more direct indicator of N source than δ(15)N(foliage), with calibration required before it could be applied to quantify BNF.

DOI: 10.1007/s00442-014-3176-3
PubMed: 25502440

Affiliations:

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

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Le document en format XML

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<term>Droughts (MeSH)</term>
<term>Ecosystem (MeSH)</term>
<term>Eucalyptus (growth & development)</term>
<term>Eucalyptus (metabolism)</term>
<term>Forests (MeSH)</term>
<term>Grassland (MeSH)</term>
<term>Mycorrhizae (MeSH)</term>
<term>Nitrogen (metabolism)</term>
<term>Nitrogen Cycle (MeSH)</term>
<term>Nitrogen Fixation (MeSH)</term>
<term>Nitrogen Isotopes (metabolism)</term>
<term>Plant Leaves (metabolism)</term>
<term>Plant Roots (metabolism)</term>
<term>Plants (metabolism)</term>
<term>Rain (MeSH)</term>
<term>Soil (MeSH)</term>
<term>Trees (MeSH)</term>
<term>Water (MeSH)</term>
<term>Wood (metabolism)</term>
<term>Xylem (metabolism)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Acacia (croissance et développement)</term>
<term>Acacia (métabolisme)</term>
<term>Arbres (MeSH)</term>
<term>Australie (MeSH)</term>
<term>Azote (métabolisme)</term>
<term>Bois (métabolisme)</term>
<term>Cycle de l'azote (MeSH)</term>
<term>Eau (MeSH)</term>
<term>Eucalyptus (croissance et développement)</term>
<term>Eucalyptus (métabolisme)</term>
<term>Feuilles de plante (métabolisme)</term>
<term>Fixation de l'azote (MeSH)</term>
<term>Forêts (MeSH)</term>
<term>Isotopes de l'azote (métabolisme)</term>
<term>Mycorhizes (MeSH)</term>
<term>Plantes (métabolisme)</term>
<term>Pluie (MeSH)</term>
<term>Prairie (MeSH)</term>
<term>Racines de plante (métabolisme)</term>
<term>Sol (MeSH)</term>
<term>Sécheresses (MeSH)</term>
<term>Xylème (métabolisme)</term>
<term>Écosystème (MeSH)</term>
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<term>Xylem</term>
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<term>Azote</term>
<term>Bois</term>
<term>Eucalyptus</term>
<term>Feuilles de plante</term>
<term>Isotopes de l'azote</term>
<term>Plantes</term>
<term>Racines de plante</term>
<term>Xylème</term>
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<term>Droughts</term>
<term>Ecosystem</term>
<term>Forests</term>
<term>Grassland</term>
<term>Mycorrhizae</term>
<term>Nitrogen Cycle</term>
<term>Nitrogen Fixation</term>
<term>Rain</term>
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<term>Australie</term>
<term>Cycle de l'azote</term>
<term>Eau</term>
<term>Fixation de l'azote</term>
<term>Forêts</term>
<term>Mycorhizes</term>
<term>Pluie</term>
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<front><div type="abstract" xml:lang="en">Water and nitrogen (N) interact to influence soil N cycling and plant N acquisition. We studied indices of soil N availability and acquisition by woody plant taxa with distinct nutritional specialisations along a north Australian rainfall gradient from monsoonal savanna (1,600-1,300 mm annual rainfall) to semi-arid woodland (600-250 mm). Aridity resulted in increased 'openness' of N cycling, indicated by increasing δ(15)N(soil) and nitrate:ammonium ratios, as plant communities transitioned from N to water limitation. In this context, we tested the hypothesis that δ(15)N(root) xylem sap provides a more direct measure of plant N acquisition than δ(15)N(foliage). We found highly variable offsets between δ(15)N(foliage) and δ(15)N(root) xylem sap, both between taxa at a single site (1.3-3.4 ‰) and within taxa across sites (0.8-3.4 ‰). As a result, δ(15)N(foliage) overlapped between N-fixing Acacia and non-fixing Eucalyptus/Corymbia and could not be used to reliably identify biological N fixation (BNF). However, Acacia δ(15)N(root) xylem sap indicated a decline in BNF with aridity corroborated by absence of root nodules and increasing xylem sap nitrate concentrations and consistent with shifting resource limitation. Acacia dominance at arid sites may be attributed to flexibility in N acquisition rather than BNF capacity. δ(15)N(root) xylem sap showed no evidence of shifting N acquisition in non-mycorrhizal Hakea/Grevillea and indicated only minor shifts in Eucalyptus/Corymbia consistent with enrichment of δ(15)N(soil) and/or decreasing mycorrhizal colonisation with aridity. We propose that δ(15)N(root) xylem sap is a more direct indicator of N source than δ(15)N(foliage), with calibration required before it could be applied to quantify BNF.</div>
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<ArticleTitle>Natural abundance (δ¹⁵N) indicates shifts in nitrogen relations of woody taxa along a savanna-woodland continental rainfall gradient.</ArticleTitle>
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<Abstract><AbstractText>Water and nitrogen (N) interact to influence soil N cycling and plant N acquisition. We studied indices of soil N availability and acquisition by woody plant taxa with distinct nutritional specialisations along a north Australian rainfall gradient from monsoonal savanna (1,600-1,300 mm annual rainfall) to semi-arid woodland (600-250 mm). Aridity resulted in increased 'openness' of N cycling, indicated by increasing δ(15)N(soil) and nitrate:ammonium ratios, as plant communities transitioned from N to water limitation. In this context, we tested the hypothesis that δ(15)N(root) xylem sap provides a more direct measure of plant N acquisition than δ(15)N(foliage). We found highly variable offsets between δ(15)N(foliage) and δ(15)N(root) xylem sap, both between taxa at a single site (1.3-3.4 ‰) and within taxa across sites (0.8-3.4 ‰). As a result, δ(15)N(foliage) overlapped between N-fixing Acacia and non-fixing Eucalyptus/Corymbia and could not be used to reliably identify biological N fixation (BNF). However, Acacia δ(15)N(root) xylem sap indicated a decline in BNF with aridity corroborated by absence of root nodules and increasing xylem sap nitrate concentrations and consistent with shifting resource limitation. Acacia dominance at arid sites may be attributed to flexibility in N acquisition rather than BNF capacity. δ(15)N(root) xylem sap showed no evidence of shifting N acquisition in non-mycorrhizal Hakea/Grevillea and indicated only minor shifts in Eucalyptus/Corymbia consistent with enrichment of δ(15)N(soil) and/or decreasing mycorrhizal colonisation with aridity. We propose that δ(15)N(root) xylem sap is a more direct indicator of N source than δ(15)N(foliage), with calibration required before it could be applied to quantify BNF.</AbstractText>
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<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Soper</LastName>
<ForeName>Fiona M</ForeName>
<Initials>FM</Initials>
<AffiliationInfo><Affiliation>Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA, fms46@cornell.edu.</Affiliation>
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<ForeName>Marcos P M</ForeName>
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<Author ValidYN="Y"><LastName>Cook</LastName>
<ForeName>Garry D</ForeName>
<Initials>GD</Initials>
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<Author ValidYN="Y"><LastName>Hutley</LastName>
<ForeName>Lindsay B</ForeName>
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<MeshHeading><DescriptorName UI="D005052" MajorTopicYN="N">Eucalyptus</DescriptorName>
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<MeshHeading><DescriptorName UI="D010944" MajorTopicYN="N">Plants</DescriptorName>
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<MeshHeading><DescriptorName UI="D014934" MajorTopicYN="N">Wood</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D052584" MajorTopicYN="N">Xylem</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
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Natural abundance (δ¹⁵N) indicates shifts in nitrogen relations of woody taxa along a savanna-woodland continental rainfall gradient.

Natural abundance (δ¹⁵N) indicates shifts in nitrogen relations of woody taxa along a savanna-woodland continental rainfall gradient.

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