“…However, studies that addressed the effects of elevated [CO 2 ] on litter decomposition rates have found contrasting results. Although plants grown under elevated [CO 2 ] were reported to produce slow‐decomposing litter (i.e., higher concentrations of phenolic compounds, condensed tannins, lignin, and C:N; Rier et al, ; Tuchman et al, ) some authors have reported that although phytochemical composition was affected by increases in [CO 2 ], this did not result in measurable changes on litter decomposition rates (Ferreira & Chauvet, ; Martins, Melo, Gonçalves, Campos, & Hamada, ; Monroy et al, ).…”