• Author: Dieleman, Wouter I. J.

    Department of Biology, University of Antwerp, Belgium

  • Author: Vicca, Sara

    Department of Biology, University of Antwerp, Belgium

  • Author: Dijkstra, Feike A.

    Department of Environmental Sciences, The University of Sydney, Australia

  • Author: Hagedorn, Frank

    Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Switzerland

  • Author: Hovenden, Mark J.

    School of Plant Science, University of Tasmania, Australia

  • Author: Larsen, Klaus Steenberg

    Ecosystems Programme, Department of Chemical and Biochemical Engineering, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Morgan, Jack A.

    Rangeland Resources Research Unit USDA‐ARS, United States

  • Author: Volder, Astrid

    Department. of Horticultural Sciences Texas A&M University, United States

  • Author: Beier, Claus

    Ecosystems Programme, Department of Chemical and Biochemical Engineering, Technical University of Denmark

  • Author: Dukes, Jeffrey S.

    Department of Forestry and Natural Resources and Department of Biological Sciences, Purdue University, United States

  • Author: King, John

    Research Group of Plant and Vegetation Ecology Department of Biology, University of Antwerp, Belgium

  • Author: Leuzinger, Sebastian

    Forest Ecology Department of Environmental Sciences ETH Zurich, Switzerland

  • Author: Linder, Sune

    Lund University, Sweden

  • Author: Luo, Yiqi

    Department of Botany and Microbiology University of Oklahoma, United States

  • Author: Oren, Ram

    Duke University, United States

  • Author: De Angelis, Paolo

    DIBAF Department for Innovation in Biological Agro‐food and Forest systems University of Tuscia, Italy

  • Author: Tingey, David

  • Author: Hoosbeek, Marcel R.

    Wageningen University, Netherlands

  • Author: Janssens, Ivan A.

    Research Group of Plant and Vegetation Ecology Department of Biology University of Antwerp

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In recent years, increased awareness of the potential interactions between rising atmospheric CO2 concentrations ([ CO2 ]) and temperature has illustrated the importance of multifactorial ecosystem manipulation experiments for validating Earth System models. To address the urgent need for increased understanding of responses in multifactorial experiments, this article synthesizes how ecosystem productivity and soil processes respond to combined warming and [ CO2 ] manipulation, and compares it with those obtained in single factor [ CO2 ] and temperature manipulation experiments. Across all combined elevated [ CO2 ] and warming experiments, biomass production and soil respiration were typically enhanced. Responses to the combined treatment were more similar to those in the [ CO2 ]‐only treatment than to those in the warming‐only treatment. In contrast to warming‐only experiments, both the combined and the [ CO2 ]‐only treatments elicited larger stimulation of fine root biomass than of aboveground biomass, consistently stimulated soil respiration, and decreased foliar nitrogen (N) concentration. Nonetheless, mineral N availability declined less in the combined treatment than in the [ CO2 ]‐only treatment, possibly due to the warming‐induced acceleration of decomposition, implying that progressive nitrogen limitation (PNL) may not occur as commonly as anticipated from single factor [ CO2 ] treatment studies. Responses of total plant biomass, especially of aboveground biomass, revealed antagonistic interactions between elevated [ CO2 ] and warming, i.e. the response to the combined treatment was usually less‐than‐additive. This implies that productivity projections might be overestimated when models are parameterized based on single factor responses. Our results highlight the need for more (and especially more long‐term) multifactor manipulation experiments. Because single factor CO2 responses often dominated over warming responses in the combined treatments, our results also suggest that projected responses to future global warming in Earth System models should not be parameterized using single factor warming experiments.

Original languageEnglish
JournalGlobal Change Biology
Publication date2012
Volume18
Issue9
Pages2681-2693
ISSN1354-1013
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 22

Keywords

  • [CO2] enrichment, Biomass, C sequestration, Elevated temperature, Manipulative experiments, Multifactor experiments, Nitrogen availability, Soil respiration
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