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Table 4 Statistics of the waste to roundwood ratio by tree species

From: Renewable energy from secondary wood products contributes to local green development: the case of small-scale privately owned forests in Ciamis Regency, Indonesia

Species

Volume of merchantable roundwood (m3)

Volume of branch (m3)

Volume of twig (m3)

Waste to roundwood ratio

RB-L (%)

RT-L (%)

Firewood to roundwood (%)

Sengon, Mean

4.1

2.3

1.2

65.7

47.2

119.7

 Minimum

1.0

0.0

0.0

0.0

0.0

12.5

 Maximum

21.0

14.0

4.0

333.3

200.0

466.7

 Standard deviation

4.4

2.6

1.0

74.9

42.0

104.1

Mahogany, Mean

3.1

2.7

1.6

87.8

58.3

156.6

 Minimum

0.5

0.4

0.0

23.3

0.0

46.7

 Maximum

12.0

11.2

9.0

280.0

250.0

350.0

 Standard deviation

2.4

2.6

1.9

59.3

50.0

88.6

Teak, Mean

4.1

2.1

1.9

51.6

38.1

93.1

 Minimum

1.0

0.4

0.3

26.3

17.5

46.7

 Maximum

12.0

6.0

6.0

120.0

92.3

183.8

 Standard deviation

3.5

1.8

2.0

30.0

24.7

51.7

Mixed species, Mean

3.3

2.5

1.1

82.9

67.2

165.5

 Minimum

0.5

0.3

0.1

14.0

7.0

21.0

 Maximum

50.0

12.0

8.4

400.0

200.0

500.0

 Standard deviation

7.8

4.3

1.5

84.0

56.6

133.3