Table 2.
Chemical characteristics of bulk soil sampleda
| Plot nameb | NO3 -Nc | NH4 -Nc | Total N (%) | Total C (%) | pH (H2 O) |
|---|---|---|---|---|---|
| AMBI-NT | 5.0±4.3c | 36.9±37.3 | 0.20±0.02 | 1.8±0.2 | 5.9±0.2 |
| AMBI-ET | 2.7±0.6 | 34.4±10.6 | 0.19±0.03 | 1.9±0.2 | 5.9±0.2 |
| AMBI-LN | 6.3±0.6 | 11.5±2.1 | 0.17±0.04 | 1.6±0.4 | 5.9±0.1 |
| FACE-NT | 6.6±3.8 | 38.6±12.2 | 0.22±0.03 | 2.1±0.3 | 5.9±0.2 |
| FACE-ET | 3.5±1.7 | 35.7±6.9 | 0.22±0.04 | 2.1±0.4 | 5.9±0.1 |
| FACE-LN | 4.8±4.4 | 21.3±12.3 | 0.20±0.02 | 2.0±0.2 | 5.9±0.1 |
a
The average of 4 replicated plots±standard deviation.
b
Sample name stands for the combination of following environmental factors; AMBI, ambient CO2 ; FACE, free air CO2 enrichment; NT, normal surface water-soil temperature; ET, elevated surface water-soil temperature; LN, no nitrogen fertilization. See the main text for the detailed description for abbreviations of environmental factors. Soil samples were taken from depths of 1–10 cm.
c
μg g−1 dry soil.