Table 2 Total chemical properties (mean values ±SE, n = 3) of soil (depth of 0–10 cm) in each treatment in the Acer velutinum Bioss. plantation after N addition at the end of study period (April 2016). Different letters represent significant differences between treatments within each property
Soil properties | Treatment plots | |||
|---|---|---|---|---|
N0 | N1 | N2 | N3 | |
pH | 7.13 ± 0.01 a | 7.08 ± 0.01 b | 6.86 ± 0.01 c | 6.76 ± 0.01 d |
Electrical conductivity (dS m−1) | 0.84 ± 0.03 a | 0.78 ± 0.01 b | 0.75 ± 0.01 c | 0.66 ± 0.01 d |
Total N (g 100 g−1) | 0.36 ± 0.01 d | 0.41 ± 0.01 c | 0.47 ± 0.02 b | 0.58 ± 0.01 a |
\({\mathrm{NH}}_{4}^{+}\)(mg kg−1) | 4.93 ± 0.18 d | 6.04 ± 0.14 c | 7.23 ± 0.10 b | 8.53 ± 0.17 a |
\({\mathrm{NO}}_{3}^{-}\)(mg kg−1) | 5.06 ± 0.18 d | 7.21 ± 0.12 c | 9.95 ± 0.30 b | 20.5 ± 0.33 a |