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Table 3 Areas of modelled deep peat, average peat thickness (PT) and below-ground carbon stock in deep peat areas in eastern Sumatra lowland and breakdown per Province, assuming different peat bottom positions

From: Mapping deep peat carbon stock from a LiDAR based DTM and field measurements, with application to eastern Sumatra

Assumed peat bottom (m +MSL)Deep peat area (Mha)Deep peat area (%)Avg. PT (m)Below-ground deep peat carbon stock (Pg C)Below-ground deep peat carbon stock (%)Deep peat forest cover (Mha)Deep peat forest cover (%)
 Eastern Sumatra coastal lowland
0 ‘maximum peat extent’2.9 (2.6–3.1)67.4 (60.2–73.9)6.7 (6.5–6.9)10.4–13.3 (9.0–15.2)100.01.3 (1.2–1.3)45.1 (42.4–47.9)
0.61 ‘most likely peat extent’2.6 (2.0–3.1)60.1 (47.1–73.9)6.5 (6.0–6.9)9.0–11.5 (6.6–15.2)100.01.2 (1.1–1.3)47.9 (42.4–52.8)
1 ‘extent of peat below high tide limit’2.4 (2.1–2.7)53.7 (46.8–60.0)6.3 (6.1–6.5)8.2–10.5 (7.0–12.2)100.01.2 (1.1–1.3)49.3 (46.9–52.0)
1.5 ‘extent of peat above flood limit’2.2 (1.9–2.4)51.0 (44.2–57.3)6.1 (5.9–6.3)7.2–9.3 (6.1–10.8)100.01.1 (1.0–1.2)51.3 (48.9–53.8)
2 ‘minimum peat extent’2.0 (1.7–2.2)45.9 (40.0–51.8)5.9 (5.7–6.2)6.3–8.1 (5.3–15.7)100.01.0 (0.94–1.1)53.2 (51.0–55.4)
Area weighted (‘most likely peat extent’ per Province)2.6 (2.1–3.2)61.4 (48.6–74.6)6.6 (6.2–7.1)9.5–12.1 (7.0–15.7)100.01.2 (1.1–1.3)47.9 (42.5–52.9)
 Riau coastal lowland
0 ‘maximum peat extent’2.1 (1.9–2.3)78.7 (70.8–84.9)6.8 (6.6–7.1)7.8–10.0 (6.8–11.3)75.1 (74.4–75.7)1.0 (0.95–1.0)47.5 (45.1–50.1)
0.02 ‘most likely peat extent’2.1 (1.7–2.5)77.4 (63.5–91.7)6.8 (6.3–7.4)7.7–9.9 (5.9–12.7)75.1 (72.9–76.3)1.0 (0.89–1.0)48.0 (42.6–52.3)
1 ‘extent of peat below high tide limit’1.8 (1.6–2.0)66.9 (59.3–74.0)6.4 (6.2–6.6)6.2–8.0 (5.4–9.2)76.0 (75.5–76.9)0.92 (0.85–0.97)51.3 (49.1–53.4)
1.5 ‘extent of peat above flood limit’1.6 (1.5–1.8)61.4 (54.2–67.9)6.2 (6.0–6.5)5.5–7.1 (4.7–8.2)76.7 (76.0–77.5)0.87 (0.80–0.93)52.8 (51.0–55.0)
2 ‘minimum peat extent’1.5 (1.3–1.7)56.1 (49.3–62.1)6.0 (5.7–6.3)4.9–6.3 (4.1–7.3)77.4 (76.5–77.8)0.82 (0.75–0.88)54.3 (52.7–56.7)
 Jambi coastal lowland
0 ‘maximum peat extent’0.40 (0.34–0.44)71.8 (61.6–79.3)6.3 (6.2–6.6)1.4–1.8 (1.2–2.0)13.2 (12.8–13.3)0.19 (0.17–0.20)48.0 (46.4–50.6)
0.72 ‘most likely peat extent’0.33 (0.22–0.44)60.0 (40.5–78.5)6.2 (6.2–6.5)1.1–1.4 (0.76–2.0)12.8 (11.9–13.3)0.17 (0.13–0.20)50.9 (46.7–59.3)
1 ‘extent of peat below high tide limit’0.31 (0.25–0.36)56.1 (44.5–65.7)6.1 (6.1–6.2)1.0–1.3 (0.84–1.6)12.6 (12.0–13.0)0.16 (0.14–0.18)52.5 (49.7–58.1)
1.5 ‘extent of peat above flood limit’0.26 (0.21–0.32)47.2 (38.1–57.4)6.1 (6.1–6.2)0.88–1.1 (0.72–1.4)12.1 (11.8–12.6)0.15 (0.13–0.17)56.9 (51.9–59.4)
2 ‘minimum peat extent’0.22 (0.18–0.27)40.1 (33.1–48.9)6.2 (6.1–6.2)0.75–1.0 (0.62–1.2)11.9 (11.7–12.3)0.13 (0.11–0.15)59.4 (55.8–60.1)
 South Sumatra coastal lowland
0 ‘maximum peat extent’0.36 (0.32–0.43)35.5 (31.3–41.9)6.2 (6.0–6.3)1.2–1.6 (1.0–1.9)11.7 (11.5–12.3)0.10 (0.10–0.10)28.2 (24.1–31.7)
2.47 ‘most likely peat extent’0.20 (0.14–0.28)19.9 (13.8–27.5)5.3 (4.9–5.7)0.59–0.75 (0.37–1.1)10.6 (9.7–11.3)0.08 (0.07–0.10)41.6 (34.7–49.6)
1 ‘extent of peat below high tide limit’0.30 (0.25–0.33)29.0 (24.7–32.7)5.8 (5.6–6.1)0.94–1.2 (0.77–1.4)11.4 (11.1–11.6)0.10 (0.09–0.10)33.5 (30.5–37.2)
1.5 ‘extent of peat above flood limit’0.26 (0.22–0.30)25.9 (21.4–29.5)5.6 (5.5–5.9)0.81–1.0 (0.65–1.2)11.2 (10.7–11.4)0.10 (0.09–0.10)36.0 (33.1–40.3)
2 ‘minimum peat extent’0.23 (0.20–0.27)22.1 (19.2–26.4)5.5 (5.3–5.7)0.68–0.87 (0.56–1.1)10.8 (10.6–11.2)0.09 (0.08–0.10)39.6 (35.5–42.3)
  1. Below-ground deep peat carbon stock is calculated based on carbon densities ranging from 0.0545 and 0.0698 g cm−3. Deep peat forest cover in 2012 [86] and deep peat area extent relative to [56] are provided as well. Values in brackets provide range taking into account the accuracy of the DTM (RMSE 0.25–0.61 m; [69])