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Table 6 Carbon stock (t/ha) and sequestration (t/ha/year) estimates calculated by applying carbon fractions to radiata pine stand dry matter estimates in Madwick et al. (1977) and Webber and Madgwick (1983): (a) using a default carbon fraction of 0.50 g C g−1dm and (b) using tree component-specific carbon fractions for radiata pine in New Zealand

From: Carbon fraction of Pinus radiata biomass components within New Zealand

a

Carbon stock estimates based on a carbon fraction of 0.50 g C g−1dm

Stand age (years)

Stem wood

Stem bark

Branches

Needles

Cones

AGL C

AGL C seq

  

 2

0.09

0.03

0.06

0.18

0.00

0.36

0.36

  

 4

3.60

0.64

3.28

3.58

0.00

11.1

5.37

  

 6

11.3

1.46

7.49

5.78

0.00

26.0

7.48

  

 8

23.0

2.63

11.9

2.96

0.05

40.5

7.24

  

 9a

14.5

1.80

2.77

1.70

0.30

21.1

   

 10

24.8

2.39

5.69

2.93

0.11

35.9

14.8

  

 17

107.4

10.9

11.0

5.41

2.51

137.3

14.5

  

 22

121.8

13.7

13.7

4.64

1.61

155.4

3.61

  

 29

168.7

16.2

12.8

4.10

4.65

206.4

7.29

  

Residues following harvesting of stem wood plus bark

25.3

2.4

12.8

4.10

4.65

49.3

   

Residues following harvesting of stem wood only

25.3

16.2

12.8

4.10

4.65

63.0

  

b

Carbon stock estimates based on the revised component-specific carbon fractions for radiata pine

Stand age (years)

Stem wood

Stem bark

Branches

Needles

Cones

AGL C

AGL C seq

C sequestration change (%)

C stock change (%)

 2

0.08

0.03

0.06

0.19

0.00

0.36

0.36

1.6

1.6

 4

3.58

0.64

3.33

3.68

0.00

11.2

5.43

1.2

1.2

 6

11.3

1.5

7.6

5.94

0.00

26.3

7.55

1.0

1.1

 8

22.9

2.8

12.1

3.04

0.05

40.9

7.27

0.4

0.8

 9a

14.5

1.9

2.8

1.75

0.31

21.3

  

0.8

 10

24.7

2.6

5.8

3.01

0.11

36.2

14.9

0.6

0.7

 17

107.0

12.0

11.2

5.56

2.61

138.3

14.6

0.8

0.8

 22

121.3

15.0

13.9

4.76

1.67

156.6

3.66

1.2

0.8

 29

168.0

17.8

13.0

4.21

4.83

207.8

7.31

0.3

0.7

Residues following harvesting of stem wood plus bark

25.2

2.7

13.0

4.21

4.83

49.9

  

1.3

Residues following harvesting of stem wood only

25.2

17.8

13.0

4.21

4.83

65.0

  

3.2

  1. The resulting percentage changes in aboveground live (AGL) C stocks and C sequestration are shown (in part b) by stand age, as are the expected effects of harvesting the 29-year-old stand (Webber and Madgwick 1983), assuming stem wood plus bark extraction (85%) or assuming stem wood only extraction (85%), on carbon stocks of residues and stock changes (%)
  2. aC sequestration of the 9-year-old stand was not calculated because this stand had been thinned, which explains why the AGL C stock decreased relative to the AGL C stock at age 8 years