A decade of free-air CO2 enrichment increased the carbon throughput in a grass-clover ecosystem but did not drastically change carbon allocation patterns

Staddon, Philip L. ORCID: 0000-0002-7968-3179, Reinsch, Sabine, Olsson, Pål A., Ambus, Per, Lüscher, Andreas, Jakobsen, Iver and Briones, Maria Jesus (2014) A decade of free-air CO2 enrichment increased the carbon throughput in a grass-clover ecosystem but did not drastically change carbon allocation patterns. Functional Ecology, 28 (2). pp. 538-545. doi:10.1111/1365-2435.12183

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The response of the soil carbon cycle to increasing atmospheric CO2 concentration has far reaching consequences for the ecosystem carbon balance under future climatic conditions. We report on work carried out in the Swiss free‐air CO2 enrichment (FACE) experiment, where we used in situ 13CO2 labelling to determine whether elevated CO2 (+230 μL L−1) concentration changes the fate of recently assimilated carbon in the soil microbial community. Elevated CO2 (eCO2) concentration had an overall positive effect on microbial abundance (P < 0·001) with the gram‐negative bacteria showing significantly increased quantities. Gram‐negative bacteria and saprotrophic fungi tended to utilize a higher amount of recently assimilated carbon under eCO2. Arbuscular mycorrhizal fungi (AMF) utilized plant‐assimilated carbon within 1 day after the 13CO2 pulse and 13C uptake patterns in AMF suggest that carbon transfer is faster under eCO2 concentration than under ambient CO2 (aCO2). Additionally, the respiration of recently assimilated carbon was significantly higher under eCO2 than aCO2 concentration. Our data suggest that elevated atmospheric CO2 concentration accelerated and increased the utilization of recently assimilated carbon by the microbial community without changing the microbial community composition drastically. We conclude that a higher standing soil microbial biomass under eCO2 concentration was the key cause for the higher carbon flow through the plant–soil system. Carbon utilization by microbial functional groups was only little affected by a decade of CO2 enrichment.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: 13C labelling; Arbuscular mycorrhizal fungi; C flux, compound-specific 13C analysis; Elevated atmospheric CO2; Free-air CO2 enrichment; Neutral lipid fatty acids; Phospholipid fatty acids; Soil carbon
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > Q Science (General)
Q Science > QD Chemistry
Q Science > QE Geology
S Agriculture > S Agriculture (General) > S589.7 Agricultural ecology (General)
Divisions: Schools and Research Institutes > Countryside and Community Research Institute
Research Priority Areas: Place, Environment and Community
Depositing User: Imogen Young
Date Deposited: 04 Jul 2019 13:10
Last Modified: 04 Feb 2022 14:32
URI: https://eprints.glos.ac.uk/id/eprint/6894

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