Comment on "Unexpected reversal of C3 versus C4 grass response to elevated CO2 during a 20-year field experiment"
Thursday, August 30, 2018 - 13:20
in Biology & Nature
Reich et al. (Reports, 20 April 2018, p. 317) reported that elevated carbon dioxide (eCO2) switched its effect from promoting C3 grasses to favoring C4 grasses in a long-term experiment. We argue that the authors did not appropriately elucidate the interannual climate variation as a potential mechanism for the reversal of C4-C3 biomass in response to eCO2.