Application of a two-pool model to soil carbon dynamics under elevated CO2

Kees Jan Van Groenigen, Jianyang Xia, Craig W. Osenberg, Yiqi Luo, Bruce A Hungate

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Elevated atmospheric CO2 concentrations increase plant productivity and affect soil microbial communities, with possible consequences for the turnover rate of soil carbon (C) pools and feedbacks to the atmosphere. In a previous analysis (Van Groenigen et al., 2014), we used experimental data to inform a one-pool model and showed that elevated CO2 increases the decomposition rate of soil organic C, negating the storage potential of soil. However, a two-pool soil model can potentially explain patterns of soil C dynamics without invoking effects of CO2 on decomposition rates. To address this issue, we refit our data to a two-pool soil C model. We found that CO2 enrichment increases decomposition rates of both fast and slow C pools. In addition, elevated CO2 decreased the carbon use efficiency of soil microbes (CUE), thereby further reducing soil C storage. These findings are consistent with numerous empirical studies and corroborate the results from our previous analysis. To facilitate understanding of C dynamics, we suggest that empirical and theoretical studies incorporate multiple soil C pools with potentially variable decomposition rates.

Original languageEnglish (US)
Pages (from-to)4293-4297
Number of pages5
JournalGlobal Change Biology
Volume21
Issue number12
DOIs
StatePublished - Dec 1 2015

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soil carbon
Carbon
Soils
soil
decomposition
Decomposition
theoretical study
organic soil
microbial community
turnover
rate
productivity
Productivity
atmosphere
carbon
Feedback

Keywords

  • Carbon cycle
  • Data assimilation
  • Data-model fusion
  • Priming
  • Soil carbon model

ASJC Scopus subject areas

  • Ecology
  • Global and Planetary Change
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Application of a two-pool model to soil carbon dynamics under elevated CO2 . / Van Groenigen, Kees Jan; Xia, Jianyang; Osenberg, Craig W.; Luo, Yiqi; Hungate, Bruce A.

In: Global Change Biology, Vol. 21, No. 12, 01.12.2015, p. 4293-4297.

Research output: Contribution to journalArticle

Van Groenigen, Kees Jan ; Xia, Jianyang ; Osenberg, Craig W. ; Luo, Yiqi ; Hungate, Bruce A. / Application of a two-pool model to soil carbon dynamics under elevated CO2 In: Global Change Biology. 2015 ; Vol. 21, No. 12. pp. 4293-4297.
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