Respiratory fluxes and fine root responses in mature Picea abies trees exposed to elevated atmospheric CO2 concentrations View Full Text


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Article Info

DATE

2015-02-21

AUTHORS

Manuel Mildner, Martin Karl-Friedrich Bader, Christina Baumann, Christian Körner

ABSTRACT

With their dominant share in global plant biomass carbon (C), forests and their responses to atmospheric CO2 enrichment are key to the global C balance. In this free air CO2 enrichment (FACE) study, we assessed respiratory losses from stems and soil, and fine root growth of ca. 110-year-old Picea abies growing in a near-natural forest in NW Switzerland. We anticipated a stimulation of all three variables in response to a ca. 150 ppm higher CO2 concentration in the tree canopies. During the first 2.5 years of the experiment, stem CO2 efflux (Rstem) remained unresponsive to CO2 enrichment. This indicates that there is no enhancement of metabolic activity in phloem and xylem of these mature trees. Soil CO2 efflux (Rsoil) beneath trees experiencing elevated CO2 (eCO2) showed a slight but significant reduction compared to Rsoil under control trees. High CO2 trees did not increase their fine root biomass in in-growth cores after 20 months under FACE relative to the fine root fractions collected in undisturbed soil. Tree growth (stem radial increment, not shown here) remained completely unchanged although earlier experiments showed largest responses (if any) during the early years after a step increase in atmospheric CO2 concentration. The data presented here suggest C saturation of the study trees at the current close to 400 ppm CO2 ambient concentrations. Together with the high local atmospheric N-deposition rates (ca. 20 kg N ha−1 a−1), our findings imply that factors other that C and N supply appear to constrain growth and metabolism of these mature P. abies trees under eCO2. More... »

PAGES

95-111

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    30 schema:description With their dominant share in global plant biomass carbon (C), forests and their responses to atmospheric CO2 enrichment are key to the global C balance. In this free air CO2 enrichment (FACE) study, we assessed respiratory losses from stems and soil, and fine root growth of ca. 110-year-old Picea abies growing in a near-natural forest in NW Switzerland. We anticipated a stimulation of all three variables in response to a ca. 150 ppm higher CO2 concentration in the tree canopies. During the first 2.5 years of the experiment, stem CO2 efflux (Rstem) remained unresponsive to CO2 enrichment. This indicates that there is no enhancement of metabolic activity in phloem and xylem of these mature trees. Soil CO2 efflux (Rsoil) beneath trees experiencing elevated CO2 (eCO2) showed a slight but significant reduction compared to Rsoil under control trees. High CO2 trees did not increase their fine root biomass in in-growth cores after 20 months under FACE relative to the fine root fractions collected in undisturbed soil. Tree growth (stem radial increment, not shown here) remained completely unchanged although earlier experiments showed largest responses (if any) during the early years after a step increase in atmospheric CO2 concentration. The data presented here suggest C saturation of the study trees at the current close to 400 ppm CO2 ambient concentrations. Together with the high local atmospheric N-deposition rates (ca. 20 kg N ha−1 a−1), our findings imply that factors other that C and N supply appear to constrain growth and metabolism of these mature P. abies trees under eCO2.
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    37 C saturation
    38 CO2
    39 CO2 concentration
    40 CO2 efflux
    41 CO2 enrichment
    42 CO2 enrichment studies
    43 Ca
    44 N deposition rates
    45 N supply
    46 NW Switzerland
    47 P. abies trees
    48 Picea abies
    49 Picea abies trees
    50 Rsoil
    51 Switzerland
    52 abies
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    54 activity
    55 ambient concentrations
    56 atmospheric CO2 concentration
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    58 atmospheric N deposition rates
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    83 fine root biomass
    84 fine root fraction
    85 fine root growth
    86 fine root responses
    87 flux
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    90 free-air CO2 enrichment (FACE) study
    91 global C balance
    92 growth
    93 growth cores
    94 high CO2 concentration
    95 increase
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    97 loss
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    99 metabolic activity
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