title: Comment on "Mycorrhizal association as a primary control of the CO2 fertilization effect".
abstract: Terrer et al (Reports, 1 July 2016, p. 72) used meta-analysis of carbon dioxide (CO2) enrichment experiments as evidence of an interaction between mycorrhizal symbiosis and soil nitrogen availability. We challenge their database and biomass as the response metric and, hence, their recommendation that incorporation of mycorrhizae in models will improve predictions of terrestrial ecosystem responses to increasing atmospheric CO2.
authors.affiliation: Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6301, USA. rjn@ornl.gov.
authors.forename: R J
authors.initials: RJ
authors.lastname: Norby
authors.affiliation: Macquarie University, Department of Biological Sciences, North Ryde, New South Wales 2109, Australia.
authors.forename: M G
authors.initials: MG
authors.lastname: De Kauwe
authors.affiliation: Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6301, USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Walker
authors.affiliation: Senckenberg Biodiversity and Climate Research Centre (BiK-F), D-60325 Frankfurt am Main, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Werner
authors.affiliation: Biogeochemical Integration Department, Max Planck Institute for Biogeochemistry, D-07701 Jena, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Zaehle
authors.affiliation: School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109-1041, USA.
authors.forename: D R
authors.initials: DR
authors.lastname: Zak
mesh_terms: D018533:Biomass; D002245:Carbon Dioxide; D017753:Ecosystem; D038821:Mycorrhizae; D009584:Nitrogen; D012987:Soil
chemical_list: D012987:Soil; D002245:Carbon Dioxide; D009584:Nitrogen