Figure 1. Location (a) and composition (b) of Environmental Impact Evaluation Test Facility on Seepage of Geologically Stored CO2 (EIT) site.
Figure 2. Schematic diagram of experiment site (a) showing locations of CO2 flux measurements on grid at 0 m, 2.5 m, 5.0 m, 7.5 m, and 10.0 m from the well (circles) and surface trace of the 2.5 m-depth CO2 injection well (horizontal line), and site renovation (b) drawing of Zone 1 showing locations of plots for Pinus densiflora and Quercus variabilis seedlings (Kim et al., 2018).
Figure 3. Mean CO2 fluxes at 0 m, 2.5 m, 5.0 m, 7.5 m, and 10.0 m from the well during the CO2 release period. The –x and +x directions on the x-axis correspond to the south and north directions, respectively. Means with the same letter are not significantly different at the level of P<0.001.
Figure 4. Relationships between CO2 flux and total chlorophyll for the Pinus densiflora and Quercus variabilis seedlings at the treatment plot.
Figure 5. Root collar diameter (RCD; a, c) and height (H; b, d) growth rates of Pinus densiflora and Quercus variabilis seedlings from May to November in 2017. The asterisk (*) indicates the significant difference between control and CO2-elevated plots. Means with the same letter are not significantly different at the level of P < 0.0001 among distances (Duncan’s post hoc comparisons). Error bars denote standard errors of the means.
Figure 6. Relationships between CO2 flux and growth rates of root collar diameter (RCD; a) and height (H; b) for Pinus densiflora and Quercus variabilis seedlings at the treatment plot.
Figure 7. Correlation between mean CO2 flux and ΔR/S ratio for the Pinus densiflora and Quercus variabilis seedlings (a) and relationship between CO2 and O2 concentrations (b).
Table 1. Chlorophyll contents (a, b, and total) of Pinus densiflora and Quercus variabilis seedlings at the level of α = 0.05 (μg mg-1; mean±SE).
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