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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