Table 1 Nutrient and ion content, and physicochemical properties in surface soil after 4-year nitrogen addition treatment in exclosure and free grazing sites
Site | TN (mg/g) | TP (mg/g) | K (mg/g) | Na (mg/g) | NH+ 4-N (mg/kg) | NO- 3-N (mg/kg) | pH | EC (mS/cm) | SWC (%) |
|---|---|---|---|---|---|---|---|---|---|
FG-0 | 0.89±0.03b | 0.52±0.03 | 0.45±0.09b | 15.97±2.34 | 5.69±0.31c | 1.54±0.12b | 8.15±0.09a | 8.25±0.10 | 7.46±0.62a |
EX-0 | 1.49±0.04a | 0.43±0.03 | 2.57±0.23a | 17.59±2.10 | 6.86±0.76c | 3.02±0.52ab | 7.47±0.11b | 8.90±1.32 | 3.18±0.74b |
EX-1 | 1.61±0.09a | 0.46±0.02 | 2.84±0.21a | 17.71±2.03 | 17.21±0.31b | 3.41±0.28a | 7.51±0.06b | 9.25±0.77 | 3.21±0.43b |
EX-3 | 1.58±0.06a | 0.44±0.04 | 2.87±0.23a | 18.90±1.23 | 18.74±0.73ab | 3.03±0.64ab | 7.27±0.11b | 9.09±0.76 | 2.80±0.69b |
EX-5 | 1.54±0.03a | 0.48±0.04 | 2.89±0.35a | 19.53±0.61 | 19.46±0.31a | 3.62±0.54a | 7.47±0.10b | 10.60±0.61 | 3.58±0.73b |