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 journalArticlepeer-review

18 Scopus citations


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
Issue number12
StatePublished - Dec 2015


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

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • General Environmental Science


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