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Short-term carbon cycling responses of a mature eucalypt woodland to gradual stepwise enrichment of atmospheric CO sub(2) concentration

Global change biology, 2016-01, Vol.22 (1), p.380-390 [Peer Reviewed Journal]

ISSN: 1354-1013 ;EISSN: 1365-2486 ;DOI: 10.1111/gcb.13109

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  • Title:
    Short-term carbon cycling responses of a mature eucalypt woodland to gradual stepwise enrichment of atmospheric CO sub(2) concentration
  • Author: Drake, John E ; Macdonald, Catriona A ; Tjoelker, Mark G ; Crous, Kristine Y ; Gimeno, Teresa E ; Singh, Brajesh K ; Reich, Peter B ; Anderson, Ian C ; Ellsworth, David S
  • Subjects: Eucalyptus
  • Is Part Of: Global change biology, 2016-01, Vol.22 (1), p.380-390
  • Description: Projections of future climate are highly sensitive to uncertainties regarding carbon (C) uptake and storage by terrestrial ecosystems. The Eucalyptus Free-Air CO sub(2) Enrichment (EucFACE) experiment was established to study the effects of elevated atmospheric CO sub(2) concentrations (eCO sub(2)) on a native mature eucalypt woodland with low fertility soils in southeast Australia. In contrast to other FACE experiments, the concentration of CO sub(2) at EucFACE was increased gradually in steps above ambient (+0, 30, 60, 90, 120, and 150 ppm CO sub(2) above ambient of ~400 ppm), with each step lasting approximately 5 weeks. This provided a unique opportunity to study the short-term (weeks to months) response of C cycle flux components to eCO sub(2) across a range of CO sub(2) concentrations in an intact ecosystem. Soil CO sub(2) efflux (i.e., soil respiration or R sub(soil)) increased in response to initial enrichment (e.g., +30 and +60 ppm CO sub(2)) but did not continue to increase as the CO sub(2) enrichment was stepped up to higher concentrations. Light-saturated photosynthesis of canopy leaves (A sub(sat)) also showed similar stimulation by elevated CO sub(2) at +60 ppm as at +150 ppm CO sub(2). The lack of significant effects of eCO sub(2) on soil moisture, microbial biomass, or activity suggests that the increase in R sub(soil) likely reflected increased root and rhizosphere respiration rather than increased microbial decomposition of soil organic matter. This rapid increase in R sub(soil) suggests that under eCO sub(2,) additional photosynthate was produced, transported belowground, and respired. The consequences of this increased belowground activity and whether it is sustained through time in mature ecosystems under eCO sub(2) are a priority for future research.
  • Language: English
  • Identifier: ISSN: 1354-1013
    EISSN: 1365-2486
    DOI: 10.1111/gcb.13109
  • Source: Alma/SFX Local Collection
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