Table 1 Soil physical and chemical characteristics (0–10 cm) in the tropical forest before the start of fertilization (conducted in September 2009)

From: Nitrogen and phosphorus addition impact soil N2O emission in a secondary tropical forest of South China

Variables

aN

aP

aNP

Control

pH(H2O)

3.97 ± 0.05

3.95 ± 0.05

4.02 ± 0.09

3.99 ± 0.06

SOC (%)

2.90 ± 0.12

2.86 ± 0.27

2.90 ± 0.17

2.54 ± 0.16

Total N(g kg−1)

2.34 ± 0.21

2.66 ± 0.10

2.68 ± 0.19

2.71 ± 0.15

Total P(g kg−1)

0.38 ± 0.02

0.42 ± 0.02

0.43 ± 0.03

0.40 ± 0.03

Available-P(mg kg−1)

3.79 ± 0.42

4.06 ± 0.37

3.70 ± 0.60

4.10 ± 0.56

NO3−-N(mg kg−1)

2.72 ± 0.11

2.68 ± 0.31

2.35 ± 0.33

2.88 ± 0.35

NH4+-N(mg kg−1)

1.85 ± 0.13

1.81 ± 0.11

2.03 ± 0.17

2.12 ± 0.12

  1. Note: Data are expressed as means ± SE (n = 5). aN: N addition treatment; aP: P addition treatment; aNP: N and P co-addition treatment.
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