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Table 4 Effects of sub-watersheds, landscape positions, and land use on the soil carbon stocks

From: Sustainable land management interventions lead to carbon sequestration in plant biomass and soil in a mixed crop-livestock system: the case of Geda watershed, central highlands of Ethiopia

 

N

Surface and sub-surface soil carbon stocks (Mg ha−1)

0–15 cm

15–30 cm

Total (0–30 cm)

CO2 equiv.

Sub-watershed (SW)

 Untreated

40

8.70b

7.36b

16.06b

58.92b

 Treated

50

14.45a

9.95a

24.40a

89.55a

Landscape position (LP)

Untreated upper

20

8.66b

7.63b

16.29c

59.80c

  Lower

20

8.73b

7.09b

15.82c

58.05c

Treated upper

20

13.79a

12.16a

25.95a

95.21a

  Lower

30

14.90a

8.48b

23.38b

85.77b

Land-use types (LU)

Untreated crop

20

8.34c

7.62c

15.97c

58.59c

  Grazing

20

9.05c

7.10c

16.15c

59.26c

Treated crop

20

14.65b

12.98a

27.43a

100.66a

  Grazing

20

13.43b

9.76b

23.19b

85.12b

  Tree lucerne

10

16.10a

4.66d

20.76b

76.18b

P-SW

 

***

***

***

***

P-LP

 

ns

***

*

*

P-LU

 

*

***

**

**

  1. Means within columns under each topic followed by different letter(s) are significantly different from each other at P ≤ 0.05; *significant at P ≤ 0.05; **significant at P ≤ 0.01;***significant at P ≤ 0.001; ns non-significant; equiv. equivalent