Can Carbon Sequestration in Tasmanian “Wet” Eucalypt Forests Be Used to Mitigate Climate Change? Forest Succession, the Buffering Effects of Soils, and Landscape Processes Must Be Taken into Account

Table 3

Mean soil C at seven site pairs in Tasmania, from the data of Hardcastle ([48], sites 1–5) and Klöffel ([49], sites 6 and 7), adjusted for stone content.

Site ID

Forest type^1

Soil C by sampling depth^2 (Mg·ha^−1)

EBD by sampling depth (Mg m^−3)

Total C (Mg·ha^−1)

0–10 cm

10–20 cm

20–30 cm

30–60 cm

60–100 cm

0–10 cm

10–20 cm

20–30 cm

30–60 cm

60–100 cm

(1) Mueller Road

R

37.5 ± 6.5

31.1 ± 8.7

27.8 ± 9.9

35.5^3

—

0.53 ± 0.17

1.03 ± 0.20

0.99 ± 0.13

1.42

—

132

M

49.9 ± 8.1

42.7 ± 11.3

39.8 ± 15.9

40.0^3

—

0.53 ± 0.21

0.83 ± 0.16

0.96 ± 0.20

1.12

—

172

(2) Styx Road

R

52.0 ± 9.0

42.0 ± 8.3

37.9 ± 16.4

119.4

74.8

0.43 ± 0.14

0.64 ± 0.10

0.74 ± 0.17

0.91

0.99

326

M

45.3 ± 8.3

39.0 ± 7.2

34.8 ± 6.8

101.3

84.0

0.49 ± 0.19

0.66 ± 0.18

0.88 ± 0.15

0.96

0.93

304

(3) Eleven Road

R

25.8 ± 6.4

24.9 ± 3.7

21.4 ± 3.6

113.4

114.3

0.59 ± 0.21

0.81 ± 0.15

1.05 ± 0.22

1.10

1.21

300

M

37.5 ± 13.9

36.5 ± 10.1

34.5 ± 13.0

44.6

49.6

0.35 ± 0.14

0.67 ± 0.21

1.13 ± 0.20

1.65

1.30

203

(4) Florentine Road

R

23.5 ± 4.1

16.5 ± 7.8

11.7 ± 5.7

27.0

30.8

0.72 ± 0.13

0.92 ± 0.21

0.84 ± 0.23

0.95

1.10

110

M

23.0 ± 8.5

20.1 ± 15.5

16.0 ± 10.3

37.9

27.4

0.65 ± 0.21

0.87 ± 0.22

0.94 ± 0.22

1.11

1.18

124

(5) Sumac Road

R

51.9 ± 4.9

51.4 ± 4.5

40.5 ± 10.6

73.5

19.2^4

0.58 ± 0.05

0.81 ± 0.09

0.82 ± 0.21

1.10

1.09

237

M

42.7 ± 6.9

47.5 ± 7.8

44.2 ± 6.8

94.3

31.3^4

0.51 ± 0.08

0.86 ± 0.08

0.97 ± 0.15

1.06

1.13

260

(6) South Esk Road

R

36.7 ± 4.6

36.6 ± 4.4

17.8 ± 3.5

74.6

35.4

0.62 ± 0.09

0.83 ± 0.08

0.55 ± 0.00

0.72

0.90

201

M

39.9 ± 12.9

30.6 ± 11.4

22.6 ± 8.7

43.1

40.2

0.62 ± 0.09

0.62 ± 0.09

0.62 ± 0.09

0.90

0.79

176

(7) Tipunah

R

44.8 ± 10.0

25.6 ± 6.7

5.3 ± 2.2

18.7

—

0.79 ± 0.17

1.15 ± 0.20

0.55 ± 0

1.36

-

115

M

53.5 ± 8.9

24.7 ± 6.4

9.0 ± 2.4

64.6

—

0.61 ± 0.12

1.04 ± 0.21

0.55 ± 0

1.26

-

152

Mean total C values (Mg·ha^−1)

0–30 cm depth

0–100 cm depth^5

Mean

Std. Dev.

Range

Mean

Std. Dev.

Range

R

95

34

52–144

203

89

110–326

M

105

33

59–134

199

83

124–304

¹R = rainforest; M = mixed. ²Each topsoil figure (0–10 cm, 10–20 cm, and 20–30 cm depth increments) is the mean of 10 samples. Subsoil figures are the means of three samples for each depth increment (30–60 cm and 60–100 cm, or to a rock contact) for sites 1–5 and are from analysis of one sample per depth increment for sites 6 and 7. ³The rainforest profile was 42 cm deep on rock and the mixed forest profile was 45 cm deep on rock. C figures have been calculated to 42 cm depth for both profiles. ⁴The rainforest profile was 95 cm deep on rock and the mixed forest profile was 80 cm deep on rock. C figures have been calculated to 80 cm depth for both profiles. ⁵To a rock contact at sites 1 and 7; see also footnotes 3 and 4.