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Communication Dans Un Congrès Année : 2009

Ecosystem effects of elevated CO2 concentrations on microbial populations at a terrestrial CO2 vent at Laacher See, Germany

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Résumé

CO 2 capture and sto rage in deep saline aquifers or depleted gas and oil reservoirs offer is one option for reducing greenhouse gas emissions. Our study aims at investigating the environmental impact of CO 2 leakage from deep reservoirs into near-surface terrestrial environmen ts. To understand the effect of unlikely, but potential CO2 release on such an ecosystem, detailed knowledge on the abundance and diversity of plants and microorganisms is essential. Therefore, an ecosystem study has been conducted within the N etwork of Excellence “ CO2GeoNet” on a natural CO2 vent at the Laacher See, Germany. The investigation of environmentally important microbial communities in the soil samples show ed significant differences between the CO 2-rich (>90 % of soil gas) , the medium CO 2 (20%) , and the control site with background CO 2 concentrations. The ecosystem appears to have adapted to the different conditions through species substitution or adaptation, showing a shift towards anaerobic and acidophilic species under elevated CO 2 con centrations. At the end, this study should identify possible candidates in the botanical and microbial kingdoms, whose presence or absence provide easily detectable indicators for the leakage of CO 2 fro m deep reservoirs into near-surface terrestrial ecosystems.

Dates et versions

hal-00519592 , version 1 (20-09-2010)

Identifiants

Citer

Martin Krüger, Julia West, Janin Frerichs, Birte Oppermann, Marie Christine Dictor, et al.. Ecosystem effects of elevated CO2 concentrations on microbial populations at a terrestrial CO2 vent at Laacher See, Germany. 9th International Conference on Greenhouse Gas Control Technologies, Nov 2008, Washington, United States. p. 1933-1939, ⟨10.1016/j.egypro.2009.01.252⟩. ⟨hal-00519592⟩

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