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 |