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Effects of eCO2, eO3 and eCO2+eO3 on carbon degradation genes detected in the surface soil (0–5 cm). The complexity of carbon is presented in the order from labile to recalcitrant. All data are presented as mean±s.e. Significance among the treatments was analyzed by multi-way ANOVA. The significance of a and b is at P<0.05 level.
