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

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)

1.3 (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)

1.2 (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)

1.2 (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)

1.1 (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)

1.0 (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)

1.2 (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)