Norby et al. center their critique on the design of the data set and the response variable used. We address these criticisms and reinforce the conclusion that plants that associate with ectomycorrhizal fungi exhibit larger biomass and growth responses to elevated CO2 compared with plants that associate with arbuscular mycorrhizae.
Bibliographical noteFunding Information:
We thank D. Blumenthal, M. Hovenden, A. Talhelm, A. Finzi, P. Newton, N. Chiariello, C. Kammann, C. Müller, C. Field, and M. Schneider, who provided data and advice. This research is a contribution to the Imperial College initiative Grand Challenges in Ecosystems and the Environment and the AXA Chair Programme in Biosphere and Climate Impacts. C.T. was supported by an Imperial College Ph.D. studentship within this program and the International Institute for Applied System Analysis (IIASA). S.V. is a postdoctoral fellow of the Research Foundation–Flanders (FWO). C.T. and S.V. acknowledge support from Climate Change Manipulation Experiments in Terrestrial Ecosystems (ClimMani) European Cooperation in Science and Technology (COST) Action (ES1308). R.P.P. acknowledges support from NSF (Ecosystem Studies Program 1153401) and DOE (Environmental System Science Program). R.P.P. and C.T. thank the Royal Netherlands Academy of Arts and Sciences, DOE, INTERFACE, and the New Phytologist trust for funding the workshop “Climate models revisited: The biogeochemical consequences of mycorrhizal dynamics.” S.V. and O.F. acknowledge support from the European Research Council grant ERC-SyG-610028 IMBALANCE-P. Part of J.B.F.’s contribution was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. B.D.S. is funded by the Swiss National Science Foundation. All authors contributed to the development of the conceptual framework and to the writing of this Response.
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