## 4 Results
### CO\({}_{2}\) Sequestration
#### 4.3.2 CO2 Sequestration by the Forests of Japan
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Forest Type**} & \multirow{2}{*}{**Age (years)**} & \multicolumn{4}{c}{**t-CO\({}_{2}\)/ha/yr**} & \multicolumn{4}{c}{**Area (ha)**} & \multicolumn{4}{c}{**Total Mt-CO\({}_{2}\)**} \\ \cline{3-11}  & & **Site 1** & **Site 2** & **Site 3** & **Site 1** & **Site 2** & **Site 3** & **Site 1** & **Site 2** & **Site 3** \\ \hline \multirow{10}{*}{**Forest Type**} & 0–5 & \multirow{3}{*}{3.38} & 2.56 & 1.70 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\  & 5–10 & & & & & & & & & & \\  & 10–15 & 13.23 & 9.57 & 6.20 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\  & 15–20 & 16.11 & 11.45 & 6.76 & 22,826 & 6,575 & 7,332 & 0.37 & 0.08 & 0.05 \\  & 20–25 & 12.21 & 8.49 & 5.83 & 592,573 & 69,564 & 97,357 & 7.24 & 0.59 & 0.57 \\  & 25–30 & 10.05 & 7.83 & 5.34 & 2,700,597 & 705,043 & 230,650 & 27.15 & 5.52 & 1.23 \\  & 30–35 & 8.16 & 6.74 & 5.21 & 989,309 & 1,168,617 & 904,797 & 8.07 & 7.87 & 4.72 \\  & 35–40 & 6.42 & 5.87 & 4.89 & 137,687 & 600,268 & 1,791,110 & 0.88 & 3.52 & 8.76 \\  & 40–45 & 5.61 & 5.07 & 4.41 & 31,225 & 122,804 & 1,023,606 & 0.18 & 0.62 & 4.51 \\  & 45–50 & 5.41 & 4.63 & 3.78 & 7,835 & 38,352 & 349,890 & 0.04 & 0.18 & 1.32 \\  & 50–55 & 4.84 & 4.20 & 3.30 & 2,179 & 5,265 & 287,697 & 0.01 & 0.02 & 0.95 \\  & 55–60 & 4.08 & 3.61 & 2.91 & 684 & 7,685 & 78,352 & 0.00 & 0.03 & 0.23 \\  & 60–65 & 3.35 & 2.92 & 2.29 & 183 & 877.37 & 15,174 & 0.00 & 0.00 & 0.03 \\  & 65–70 & 2.47 & 1.78 & 1.40 & 1.57 & 1,986 & 9,501 & 0.00 & 0.00 & 0.01 \\  & 70–75 & 2.17 & 1.41 & 1.03 & 0.79 & 190.96 & 9,136 & 0.00 & 0.00 & 0.01 \\  & over 75 & 1.18 & 0.42 & 0.42 & 30.57 & 1,098 & 296,715 & 0.00 & 0.00 & 0.13 \\ \hline \multirow{2}{*}{**Total Overall**} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} & \multirow{2}{*}{} \\  & & & & & & & & & & & \\ \end{tabular}
\end{table} 
Table 3: CO\({}_{2}\) sequestration of coniferous forests by tree age using the PALSAR data and the stem volume method. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Forest Type** & **Age (years)** & **t-CO\({}_{2}\)/ha/yr** & **Area (ha)** & **Total Mt-CO\({}_{2}\)** \\ \hline \multirow{6}{*}{**Toral**} & 0–5 & 2.91 & 38,756 & 0.11 \\  & 5–10 & 6.33 & 58,850 & 0.37 \\  & 10–15 & 6.50 & 151,418 & 0.98 \\  & 15–20 & 6.89 & 91,892 & 0.63 \\  & 20–25 & 5.96 & 90,147 & 0.54 \\  & 25–30 & 5.20 & 78,751 & 0.41 \\  & 30–35 & 5.09 & 62,852 & 0.32 \\  & 35–40 & 3.79 & 48,437 & 0.18 \\  & 40–45 & 3.52 & 57,704 & 0.20 \\  & 45–50 & 3.13 & 36,219 & 0.11 \\  & over 50 & 1.87 & 9,475,569 & 17.74 \\ \hline Total & & & 10,190,332 & 21.61 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: CO\({}_{2}\) sequestration of deciduous broadleaf forests by tree age using the PALSAR data and the stem volume method. Figure 13: Trend of CO\({}_{2}\) values by tree age classes for (**a**) coniferous and (**b**) deciduous/evergreen broadleaf forests. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Forest Type** & **Age (years)** & **t-CO\({}_{2}\)/ha/yr** & **Area (ha)** & **Total Mt-CO\({}_{2}\)** \\ \hline \multirow{6}{*}{**Toral**} & 0–5 & 2.46 & 35,540 & 0.09 \\  & 5–10 & 6.43 & 33,957 & 0.22 \\  & 10–15 & 6.57 & 15,752 & 0.10 \\  & 15–20 & 6.93 & 17,987 & 0.12 \\  & 20–25 & 6.27 & 20,771 & 0.13 \\  & 25–30 & 5.32 & 23,800 & 0.13 \\  & 30–35 & 5.38 & 68,927 & 0.37 \\  & 35–40 & 3.93 & 31,164 & 0.12 \\  & 40–45 & 3.74 & 36,252 & 0.14 \\  & 45–50 & 3.23 & 41,367 & 0.13 \\  & over 50 & 1.87 & 1,716,706 & 3.21 \\ \hline Total & & & 2,042,228 & 4.76 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: CO\({}_{2}\) sequestration of evergreen broadleaf forests by tree age using the PALSAR data and the stem volume method.