Ecological Archives E095-030-A3

Adam F. A. Pellegrini, William A. Hoffmann, Augusto C. Franco. 2014. Carbon accumulation and nitrogen pool recovery during transitions from savanna to forest in central Brazil. Ecology 95:342–352. http://dx.doi.org/10.1890/13-0290.1

Appendix C. Summary tables and statistical analyses of ecosystem C and N stocks.

Table C1. Total ecosystem carbon stocks. Carbon stocks in the woody vegetation (AG = aboveground; BG = belowground) were calculated using allometry defined in text and using %C measured in leaves (averaged across the four species collected) and wood. All other C calculations are discussed in text.

Plot

 

Total C (Mg/ha)

   

Woody AG

Woody BG

Herb

Litter

Top

Middle

Total

1

 

2.3

1.0

2.2

0.3

14.6

22.2

42.7

2

 

2.5

1.1

0.5

0.5

16.5

24.7

45.8

3

 

9.8

3.7

0.3

2.3

21.3

27.1

64.6

4

 

14.8

5.4

0.6

1.7

18.1

23.7

64.3

5

 

15.6

5.6

0.005

1.9

16.1

29.9

69.2

6

 

21.8

7.6

0.09

5.7

28.3

33.3

96.7

7

 

84.5

25.4

0.004

7.6

31.0

30.8

179.2

 

Table C2. Total ecosystem nitrogen stocks. Nitrogen stocks in the woody vegetation (AG = aboveground; BG = belowground) were calculated using allometry defined in text and using %N measured in leaves (averaged across the four species collected) and wood (used for wood and belowground biomass). All other N calculations are discussed in text.

Plot

 

Total N (kg·N·ha-1)

 

   

Woody AG

Woody BG

Herb

Litter

Top

Middle

Total

1

 

34.0

7.8

120.0

3.1

821

986

1972

2

 

37.3

8.4

29.0

6.4

748

1132

1961

3

 

143.4

27.9

17.0

32.5

913

1314

2447

4

 

210.6

39.3

32.0

29.8

803

1168

2283

5

 

222.8

41.4

0.27

30.6

858

1570

2722

6

 

302.9

56.8

4.64

135.5

1332

1643

3475

7

 

1281.3

205.1

0.216

152.4

1424

1460

4523

 

Table C3. Concentrations of C and N (both in mg g-soil-1) at three depths in the deeper soil layers across the woody biomass gradient in biogeochemical pools.

Plot

Biomass (Mg/ha)

 

25 cm

 

50 cm

 

100 cm

 

C

N

 

C

N

 

C

N

1

6.7

 

21.8

1.1

 

12.2

0.7

 

9.4

0.5

2

7.1

 

20.2

1.2

 

11.7

0.6

 

8.9

0.5

3

27.1

 

24.3

1.5

 

15.8

0.8

 

11.4

0.5

4

40.4

 

18.1

1.1

 

13.6

0.7

 

9.8

0.5

5

42.6

 

18.1

1.1

 

13.9

0.9

 

9.4

0.5

6

58.7

 

20.8

1.3

 

14.7

0.8

 

9.6

0.5

7

219.6

 

17.3

1.1

 

11.6

0.6

 

8.7

0.4

 

Table C4. Statistics on the concentrations of C and N across the woody biomass gradient (AGBM is aboveground woody biomass).

Model

 

25 cm

 

50 cm

 

100 cm

   

R²

F

p

 

R²

F

p

 

R²

F

p

mg C g-soil-1 ~ AGBM

 

0.16

2.20

0.2

 

<0

0.57

0.48

 

<0

0.94

0.38

mg N g-soil-1 ~ AGBM

 

<0

0.33

0.59

 

<0

0.68

0.45

 

0.39

4.94

0.08

 

Table C5. Concentrations of C, N, and C:N ratios across the woody biomass gradient in biogeochemical pools.

Plot

Biomass (Mg/ha)

 

mg C g-sample-1

 

mg N g-sample-1

 

C:N

     

Litter

Top

Middle

 

Litter

Top

Middle

 

Litter

Top

Middle

1

6.7

 

466

40

31

 

5.5

2.3

1.4

 

85.5

18.3

22.6

2

7.1

 

458

45

34

 

5.6

2.1

1.6

 

82.6

22.1

21.8

3

27.1

 

461

58

37

 

6.5

2.5

1.8

 

74.6

23.4

20.7

4

40.4

 

414

50

33

 

7.8

2.2

1.6

 

57.5

22.5

20.3

5

42.6

 

457

44

41

 

7.4

2.4

2.2

 

62.2

18.8

19.0

6

58.7

 

480

78

46

 

11.4

3.7

2.3

 

42.3

21.3

20.3

7

219.6

 

436

85

42

 

8.8

3.9

2.0

 

51.5

22.1

21.2

 

Table C6. Inorganic N concentrations across the woody biomass gradient in litter and upper soil layers.

Plot

Biomass (Mg/ha)

 

NH4+-N
(μg g-sample-1)

 

NO3--N
(μg g-sample-1)

 

Total Inorganic N
(μg g-sample-1)

     

Litter

Top

Middle

 

Litter

Top

Middle

 

Litter

Top

Middle

Total

1

6.7

 

5.25

2.19

2.55

 

0.69

0.16

0.13

 

5.94

2.35

2.69

10.97

2

7.1

 

1.36

2.95

2.39

 

0.87

0.38

0.55

 

2.23

3.34

2.94

8.50

3

27.1

 

9.27

3.01

2.99

 

1.01

0.29

0.53

 

10.28

3.30

3.52

17.09

4

40.4

 

11.43

5.36

3.18

 

0.84

1.04

0.67

 

12.28

6.40

3.85

22.53

5

42.6

 

9.19

3.12

2.61

 

1.27

1.07

0.85

 

10.46

4.19

3.46

18.11

6

58.7

 

35.15

11.64

4.93

 

3.03

0.57

0.38

 

38.18

12.21

5.31

55.70

7

219.6

 

9.45

6.44

5.37

 

1.73

0.62

0.49

 

11.18

7.06

5.86

24.10

 

FigC1

Fig. C1. Changes in soil C (A) and N (B) concentrations across the gradient in woody biomass.


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