Soil nitrogen status as a regulator of carbon substrate flows through microbial communities with elevated CO2
Identifieur interne : 001794 ( Main/Exploration ); précédent : 001793; suivant : 001795Soil nitrogen status as a regulator of carbon substrate flows through microbial communities with elevated CO2
Auteurs : Susan E. Ziegler [Canada] ; Sharon A. Billings [États-Unis]Source :
- Journal of Geophysical Research: Biogeosciences [ 0148-0227 ] ; 2011-03.
Abstract
To assess how microbial processing of organic C inputs to forest soils may be influenced by elevated CO2 and altered N dynamics, we followed the fate of 13C‐labeled substrates in soils from the Duke Free Air Carbon Enrichment site where differences in soil N status have been imposed by 7 years of N amendments. Heterotrophic respiration and δ13C of respired CO2‐C and phospholipid fatty acids (PLFA) were measured to track activities of microbial groups and estimate a relative measure of substrate use efficiency (PLFA‐based SUE). Results indicate an increased proportion of fungal and actinomycete activity in elevated CO2 soils, which varied with substrate. The negative effect of N on vanillin phenolic‐C incorporation into actinomycete PLFA suggests legacies of fertilization can mitigate increased C flow into actinomycetes with elevated CO2. Further, the fourfold increase in PLFA‐based SUE for vanillin phenolic‐C in elevated CO2 soils that received N suggests future enhanced N limitation in elevated CO2 soils may promote enhanced respiratory loss relative to incorporation of some C‐substrates into microbial biomass. These short‐term incubations did not reveal greater loss of soil organic carbon via respiration or shifts in SUE with elevated CO2. However, observed relative increases in activity of actinomycetes and fungi with elevated CO2 and mitigation of this effect on actinomycetes with N amendments suggests that elevated CO2 and predicted N limitation may alter the fate of slow‐turnover soil organic matter (SOM) in two competing ways. Investigations need to focus on how these microorganisms may increase slow‐turnover substrate use while possibly enhancing the prevalence of microbial cell wall structures that can serve as precursors of stabilized SOM.
Url:
DOI: 10.1029/2010JG001434
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 002363
- to stream Istex, to step Curation: 002363
- to stream Istex, to step Checkpoint: 000379
- to stream Main, to step Merge: 001872
- to stream Main, to step Curation: 001794
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Soil nitrogen status as a regulator of carbon substrate flows through microbial communities with elevated CO2</title><author><name sortKey="Ziegler, Susan E" sort="Ziegler, Susan E" uniqKey="Ziegler S" first="Susan E." last="Ziegler">Susan E. Ziegler</name></author><author><name sortKey="Billings, Sharon A" sort="Billings, Sharon A" uniqKey="Billings S" first="Sharon A." last="Billings">Sharon A. Billings</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:76992B6B96AC9A9314A96D5789519562A4E97ED5</idno><date when="2011" year="2011">2011</date><idno type="doi">10.1029/2010JG001434</idno><idno type="url">https://api-v5.istex.fr/document/76992B6B96AC9A9314A96D5789519562A4E97ED5/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">002363</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">002363</idno><idno type="wicri:Area/Istex/Curation">002363</idno><idno type="wicri:Area/Istex/Checkpoint">000379</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000379</idno><idno type="wicri:doubleKey">0148-0227:2011:Ziegler S:soil:nitrogen:status</idno><idno type="wicri:Area/Main/Merge">001872</idno><idno type="wicri:Area/Main/Curation">001794</idno><idno type="wicri:Area/Main/Exploration">001794</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Soil nitrogen status as a regulator of carbon substrate flows through microbial communities with elevated CO2</title><author><name sortKey="Ziegler, Susan E" sort="Ziegler, Susan E" uniqKey="Ziegler S" first="Susan E." last="Ziegler">Susan E. Ziegler</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Earth Science, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador</wicri:regionArea><wicri:noRegion>Newfoundland and Labrador</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Canada</country></affiliation></author><author><name sortKey="Billings, Sharon A" sort="Billings, Sharon A" uniqKey="Billings S" first="Sharon A." last="Billings">Sharon A. Billings</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Ecology and Evolutionary Biology and Kansas Biological Survey, University of Kansas, Kansas, Lawrence</wicri:regionArea><orgName type="university">Université du Kansas</orgName><placeName><settlement type="city">Lawrence (Kansas)</settlement><region type="state">Kansas</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Geophysical Research: Biogeosciences</title><title level="j" type="abbrev">J. Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2011-03">2011-03</date><biblScope unit="volume">116</biblScope><biblScope unit="issue">G1</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">76992B6B96AC9A9314A96D5789519562A4E97ED5</idno><idno type="DOI">10.1029/2010JG001434</idno><idno type="ArticleID">2010JG001434</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">To assess how microbial processing of organic C inputs to forest soils may be influenced by elevated CO2 and altered N dynamics, we followed the fate of 13C‐labeled substrates in soils from the Duke Free Air Carbon Enrichment site where differences in soil N status have been imposed by 7 years of N amendments. Heterotrophic respiration and δ13C of respired CO2‐C and phospholipid fatty acids (PLFA) were measured to track activities of microbial groups and estimate a relative measure of substrate use efficiency (PLFA‐based SUE). Results indicate an increased proportion of fungal and actinomycete activity in elevated CO2 soils, which varied with substrate. The negative effect of N on vanillin phenolic‐C incorporation into actinomycete PLFA suggests legacies of fertilization can mitigate increased C flow into actinomycetes with elevated CO2. Further, the fourfold increase in PLFA‐based SUE for vanillin phenolic‐C in elevated CO2 soils that received N suggests future enhanced N limitation in elevated CO2 soils may promote enhanced respiratory loss relative to incorporation of some C‐substrates into microbial biomass. These short‐term incubations did not reveal greater loss of soil organic carbon via respiration or shifts in SUE with elevated CO2. However, observed relative increases in activity of actinomycetes and fungi with elevated CO2 and mitigation of this effect on actinomycetes with N amendments suggests that elevated CO2 and predicted N limitation may alter the fate of slow‐turnover soil organic matter (SOM) in two competing ways. Investigations need to focus on how these microorganisms may increase slow‐turnover substrate use while possibly enhancing the prevalence of microbial cell wall structures that can serve as precursors of stabilized SOM.</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country><region><li>Kansas</li></region><settlement><li>Lawrence (Kansas)</li></settlement><orgName><li>Université du Kansas</li></orgName></list><tree><country name="Canada"><noRegion><name sortKey="Ziegler, Susan E" sort="Ziegler, Susan E" uniqKey="Ziegler S" first="Susan E." last="Ziegler">Susan E. Ziegler</name></noRegion><name sortKey="Ziegler, Susan E" sort="Ziegler, Susan E" uniqKey="Ziegler S" first="Susan E." last="Ziegler">Susan E. Ziegler</name></country><country name="États-Unis"><region name="Kansas"><name sortKey="Billings, Sharon A" sort="Billings, Sharon A" uniqKey="Billings S" first="Sharon A." last="Billings">Sharon A. Billings</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001794 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 001794 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Canada
|area= ParkinsonCanadaV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:76992B6B96AC9A9314A96D5789519562A4E97ED5
|texte= Soil nitrogen status as a regulator of carbon substrate flows through microbial communities with elevated CO2
}}
| This area was generated with Dilib version V0.6.29. |  |