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Forest Ecosystems
Fig. 2 | Forest Ecosystems

Fig. 2

From: Effects of simulated acid rain on soil respiration and its component in a mixed coniferous-broadleaved forest of the three gorges reservoir area in Southwest China

Fig. 2

Variation in the annual mean soil respiration rate under different treatments (A); variation in the cumulative soil respiration under the different treatments (B); variation in the annual mean heterotrophic respiration rate under different treatments (C); and variation in the cumulative heterotrophic respiration under the different treatments (D). Vertical bars represent standard errors (n = 4). Different lowercase letters indicate significant difference between treatments (P < 0.05). UTCK, UT4.0, UT3.25, and UT2.5 indicate the control, pH 4.0, pH 3.25, and pH 2.5 simulated acid rain in the untrenched plots, respectively; TCK, T4.0, T3.25, and T2.5 indicate the control, pH 4.0, pH 3.25, and pH 2.5 simulated acid rain in the trenched plots, respectively

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