Skip to main content

Table 3 The δ13C values (‰) and C concentration (%) of plants and soils as affected by N addition, precipitation reduction and their combination (mean ± S.E)

From: Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction: interpretation of C and N dynamics

  

Control

N addition

Precipitation reduction

Combined effects

13C (‰)

Foliage

−31.56 ± 0.11

−30.85 ± 0.03

−30.12 ± 0.12

−30.89 ± 0.10

Litterfall

− 28.24 ± 0.06

−28.59 ± 0.07

−28.61 ± 0.02

−28.43 ± 0.07

Fine roots (< 2 mm)

− 28.96 ± 0.00

−27.93 ± 0.03

− 28.16 ± 0.16

−28.01 ± 0.38

Coarse roots (> 2 mm)

− 29.01 ± 0.07

−28.17 ± 0.06

−28.11 ± 0.20

−27.94 ± 0.33

Soil layer (0–10 cm)

− 27.12 ± 0.04

−27.19 ± 0.47

−27.10 ± 0.04

−27.13 ± 0.07

Soil layer (10–20 cm)

−26.07 ± 0.11

−26.55 ± 0.08

−26.02 ± 0.28

−26.26 ± 0.11

Soil layer (20–30 cm)

−25.04 ± 0.04

−24.99 ± 0.08

−25.09 ± 0.04

−25.41 ± 0.20

C (%)

Foliage

45.49 ± 0.15

45.80 ± 0.13

46.25 ± 0.09

46.26 ± 0.14

Litterfall

46.11 ± 0.14

46.68 ± 0.08

46.54 ± 0.33

46.46 ± 0.17

Fine roots (< 2 mm)

47.89 ± 0.04

47.48 ± 0.05

48.21 ± 0.03

47.40 ± 0.33

Coarse roots (> 2 mm)

47.55 ± 0.06

47.09 ± 0.10

47.91 ± 0.28

47.73 ± 0.05

Soil layer (0–10 cm)

33.16 ± 0.60

22.77 ± 2.75

28.21 ± 1.36

28.51 ± 2.16

Soil layer (10–20 cm)

12.58 ± 1.10

16.10 ± 1.19

14.78 ± 0.76

14.51 ± 1.45

Soil layer (20–30 cm)

1.78 ± 0.11

1.62 ± 0.28

2.34 ± 0.05

2.76 ± 0.20