Comment on "Unexpected reversal of C<sub>3</sub> versus C<sub>4</sub> grass response to elevated CO<sub>2</sub> during a 20-year field experiment".

Nie, Ming; Zou, Junyu; Xu, Xiao; Liang, Chao; Fang, Changming; Li, Bo · Science · 2018

editorial · Level V

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Abstract

Reich <i>et al</i> (Reports, 20 April 2018, p. 317) reported that elevated carbon dioxide (eCO<sub>2</sub>) switched its effect from promoting C<sub>3</sub> grasses to favoring C<sub>4</sub> 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 C<sub>4</sub>-C<sub>3</sub> biomass in response to eCO<sub>2</sub>.

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