Microbe-driven turnover offsets mineral-mediated storage of soil carbon under elevated CO 2

Benjamin N. Sulman, Richard P. Phillips, A. Christopher Oishi, Elena Shevliakova, Stephen Wilson Pacala

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

The sensitivity of soil organic carbon (SOC) to changing environmental conditions represents a critical uncertainty in coupled carbon cycle-climate models. Much of this uncertainty arises from our limited understanding of the extent to which root-microbe interactions induce SOC losses (through accelerated decomposition or priming) or indirectly promote SOC gains (via protection through interactions with mineral particles). We developed a new SOC model to examine priming and protection responses to rising atmospheric CO 2. The model captured disparate SOC responses at two temperate free-air CO 2 enrichment (FACE) experiments. We show that stabilization of new carbon in protected SOC pools may equal or exceed microbial priming of old SOC in ecosystems with readily decomposable litter and high clay content (for example, Oak Ridge). In contrast, carbon losses induced through priming dominate the net SOC response in ecosystems with more resistant litters and lower clay content (for example, Duke). The SOC model was fully integrated into a global terrestrial carbon cycle model to run global simulations of elevated CO 2 effects. Although protected carbon provides an important constraint on priming effects, priming nonetheless reduced SOC storage in the majority of terrestrial areas, partially counterbalancing SOC gains from enhanced ecosystem productivity.

Original languageEnglish (US)
Pages (from-to)1099-1102
Number of pages4
JournalNature Climate Change
Volume4
Issue number12
DOIs
StatePublished - Jan 1 2014

Fingerprint

soil carbon
turnover
organic carbon
mineral
soil
uncertainty
interaction
stabilization
carbon cycle
environmental factors
ecosystem
productivity
carbon
air
litter
climate
simulation
clay
experiment
carbon sequestration

All Science Journal Classification (ASJC) codes

  • Environmental Science (miscellaneous)
  • Social Sciences (miscellaneous)

Cite this

Sulman, Benjamin N. ; Phillips, Richard P. ; Oishi, A. Christopher ; Shevliakova, Elena ; Pacala, Stephen Wilson. / Microbe-driven turnover offsets mineral-mediated storage of soil carbon under elevated CO 2. In: Nature Climate Change. 2014 ; Vol. 4, No. 12. pp. 1099-1102.
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Microbe-driven turnover offsets mineral-mediated storage of soil carbon under elevated CO 2. / Sulman, Benjamin N.; Phillips, Richard P.; Oishi, A. Christopher; Shevliakova, Elena; Pacala, Stephen Wilson.

In: Nature Climate Change, Vol. 4, No. 12, 01.01.2014, p. 1099-1102.

Research output: Contribution to journalArticle

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