Seasonal change of (A) CH<sub>4</sub> emission rates and (B) δ<sup>13</sup>C of CH<sub>4</sub> emitted in planted microcosms with and without treatment with <sup>13</sup>C-labeled RS; means ± SD (n = 4).
<p>The differences between the treatments over time were examined using Duncan <i>post hoc</i> test of a one-way ANOVA. Different letters on the top of bars indicate significant difference (<i>P</i><0.05) between the data.</p