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Climate change goes underground: effects of elevated atmospheric CO2 on microbial community structure and activities in the rhizosphere

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Abstract

General concern about climate change has led to growing interest in the responses of terrestrial ecosystems to elevated concentrations of CO2 in the atmosphere. Experimentation during the last two to three decades using a large variety of approaches has provided sufficient information to conclude that enrichment of atmospheric CO2 may have severe impact on terrestrial ecosystems. This impact is mainly due to the changes in the organic C dynamics as a result of the effects of elevated CO2 on the primary source of organic C in soil, i.e., plant photosynthesis. As the majority of life in soil is heterotrophic and dependent on the input of plant-derived organic C, the activity and functioning of soil organisms will greatly be influenced by changes in the atmospheric CO2 concentration. In this review, we examine the current state of the art with respect to effects of elevated atmospheric CO2 on soil microbial communities, with a focus on microbial community structure. On the basis of the existing information, we conclude that the main effects of elevated atmospheric CO2 on soil microbiota occur via plant metabolism and root secretion, especially in C3 plants, thereby directly affecting the mycorrhizal, bacterial, and fungal communities in the close vicinity of the root. There is little or no direct effect on the microbial community of the bulk soil. In particular, we have explored the impact of these changes on rhizosphere interactions and ecosystem processes, including food web interactions.

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Authors and Affiliations

  1. Department of Terrestrial Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), P.O. Box 40, 6666 ZG, Heteren, The Netherlands

    Barbara Drigo, George A. Kowalchuk & Johannes A. van Veen

  2. Institute of Ecological Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands

    George A. Kowalchuk

  3. Institute of Biology Leiden University, P.O. Box 9516, 2300 RA, Leiden, The Netherlands

    Johannes A. van Veen

Authors
  1. Barbara Drigo
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  2. George A. Kowalchuk
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  3. Johannes A. van Veen
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Correspondence to Johannes A. van Veen.

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Drigo, B., Kowalchuk, G.A. & van Veen, J.A. Climate change goes underground: effects of elevated atmospheric CO2 on microbial community structure and activities in the rhizosphere. Biol Fertil Soils 44, 667–679 (2008). https://doi.org/10.1007/s00374-008-0277-3

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  • DOI: https://doi.org/10.1007/s00374-008-0277-3

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