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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.