Figure 5.

Values of δ¹³C of the methyl group of acetate accumulated in soil from (A) Vercelli, (B) Fuyang, and (C) Suwan, amended with either rice straw or maize straw and incubated under anoxic conditions in the absence or presence of CH₃F (1, 2, and 2% in Vercelli, Fuyang, and Suwan soil, respectively); mean ± SE, n = 3. The data in Vercelli and Fuyang soil were directly measured; those in Suwan soil were calculated from measured δ¹³C of total acetate using ${\delta }^{13}{\text{C}}_{\text{ac}-\text{methyl}}$ = δ¹³C_ac − 10‰.