Enhanced priming of old, not new soil carbon at elevated atmospheric CO2

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Vestergård, MetteUniversity of Copenhagen (författare)

Enhanced priming of old, not new soil carbon at elevated atmospheric CO2

Artikel/kapitelEngelska2016

Förlag, utgivningsår, omfång ...

Elsevier BV,2016
9 s.

Nummerbeteckningar

LIBRIS-ID:oai:lup.lub.lu.se:d05e4a67-d496-4267-b2a7-eb9e4cef3c43
https://lup.lub.lu.se/record/d05e4a67-d496-4267-b2a7-eb9e4cef3c43URI
https://doi.org/10.1016/j.soilbio.2016.06.010DOI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:art swepub-publicationtype
Ämneskategori:ref swepub-contenttype

Anmärkningar

Rising atmospheric CO2 concentrations accompanied by global warming and altered precipitation patterns calls for assessment of long-term effects of these global changes on carbon (C) dynamics in terrestrial ecosystems, as changes in net C exchange between soil and atmosphere will impact the atmospheric CO2 concentration profoundly. In many ecosystems, including the heath/grassland system studied here, increased plant production at elevated CO2 increase fresh C input from litter and root exudates to the soil and concurrently decrease soil N availability. Supply of labile C to the soil may accelerate the decomposition of soil organic C (SOC), a phenomenon termed 'the priming effect', and the priming effect is most pronounced at low soil N availability. Hence, we hypothesized that priming of SOC decomposition in response to labile C addition would increase in soil exposed to long-term elevated CO2 exposure. Further, we hypothesized that long-term warming would enhance SOC priming rates, whereas drought would decrease the priming response. We incubated soil from a long-term, full-factorial climate change field experiment, with the factors elevated atmospheric CO2 concentration, warming and prolonged summer drought with either labile C (sucrose) or water to assess the impact of labile C on SOC dynamics. We used sucrose with a 13C/12C signature that is distinct from that of the native SOC, which allowed us to assess the contribution of these two C sources to the CO2 evolved. Sucrose induced priming of SOC, and the priming response was higher in soil exposed to long-term elevated CO2 treatment. Drought tended to decrease the priming response, whereas long-term warming did not affect the level of priming significantly. We were also able to assess whether SOC-derived primed C in elevated CO2 soil was assimilated before or after the initiation of the CO2 treatment 8 years prior to sampling, because CO2 concentrations were raised by fumigating the experimental plots with pure CO2 that was 13C-depleted compared to ambient CO2. Surprisingly, we conclude that sucrose addition primed decomposition of relatively old SOC fractions, i.e. SOC assimilated more than 8 years before sampling.

Ämnesord och genrebeteckningar

NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Markvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Soil Science hsv//eng
Carbon-13
Drought
FACE
Global change
Heathland
Warming

Biuppslag (personer, institutioner, konferenser, titlar ...)

Reinsch, SabineTechnical University of Denmark (författare)
Bengtson, PerLund University,Lunds universitet,Mikrobiologisk ekologi,Forskargrupper vid Lunds universitet,Microbial Ecology,Lund University Research Groups(Swepub:lu)ekol-pbe (författare)
Ambus, PerTechnical University of Denmark (författare)
Christensen, SørenUniversity of Copenhagen (författare)
University of CopenhagenTechnical University of Denmark (creator_code:org_t)

Sammanhörande titlar

Ingår i:Soil Biology and Biochemistry: Elsevier BV100, s. 140-1480038-0717

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Soil Biology and Biochemistry (Sök värdpublikationen i LIBRIS)

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Av författaren/redakt...: Vestergård, Mett ...; Reinsch, Sabine; Bengtson, Per; Ambus, Per; Christensen, Sør ...

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NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Miljövetenskap

LANTBRUKSVETENSKAPER: LANTBRUKSVETENSK ...; och Lantbruksvetensk ...; och Markvetenskap

Artiklar i publikationen: Soil Biology and ...

Av lärosätet: Lunds universitet

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