Table 1.
Physical and chemical properties of the twenty-three soils used for the meta-analysis.
| aLocation and experimental design | Soil type | Sample name | Treatment | pH | Organic matter (mg kg−1) | NH+4-N (mg kg−1) | NO−3-N (mg kg−1) | Longitude (°) | Latitude (°) | Altitude (m above sea level) | Mean temperature (°C) | Reference |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Taoyuan(TY), | Acidic | TY PM | Pine plantation | 4.1 | 11.6 | 0.0 | 18.5 | 111.433 | 28.917 | 110 | 16.5 | Ying et al., 2010 |
| Hunan, | red soil | TY CM | Cropland | 4.1 | 9.5 | 2.4 | 45.3 | 111.433 | 28.917 | 110 | 16.5 | |
| Land utilization | TY DM | Degradation | 4.3 | 14.0 | 1.6 | 0.5 | 111.433 | 28.917 | 110 | 16.5 | ||
| patterns | TY RM | Restoration | 4.2 | 16.5 | 6.2 | 13.3 | 111.433 | 28.917 | 110 | 16.5 | ||
| Taoyuan(TYP), Hunan, Different fertilizations | Acidic paddy soil | TYP NPK+C | bN, P, K fertilizers and organic matter | 5.3 | 41.6 | 85.9 | 0.9 | 111.433 | 28.917 | 110 | 16.5 | Chen et al., 2011 |
| TYP NK | N plus K | 5.3 | 30.4 | 55.8 | 0.7 | 111.433 | 28.917 | 110 | 16.5 | |||
| TYP CK | No fertilization | 5.4 | 29.2 | 27.1 | 0.6 | 111.433 | 28.917 | 110 | 16.5 | |||
| Qiyang(QY), Hunan, Different fertilizations | Acidic red soil | QY NK | N plus K fertilizers | 3.8 | 14.3 | 15.5 | 35.2 | 111.867 | 26.750 | 100 | 18.0 | He et al., 2007 |
| QY NP | N plus P fertilizers | 4.0 | 16.4 | 13.4 | 21.5 | 111.867 | 26.750 | 100 | 18.0 | |||
| QY N | N fertilizer | 3.7 | 15.2 | 21.0 | 43.6 | 111.867 | 26.750 | 100 | 18.0 | |||
| QY PK | P plus K fertilizers | 5.0 | 14.6 | 19.7 | 6.0 | 111.867 | 26.750 | 100 | 18.0 | |||
| QY NPK | N, P, K fertilizers | 4.0 | 16.9 | 27.8 | 8.7 | 111.867 | 26.750 | 100 | 18.0 | |||
| QY CK | No fertilization | 5.5 | 13.6 | 19.1 | 5.1 | 111.867 | 26.750 | 100 | 18.0 | |||
| QY Fallow | Fallow | 5.8 | 13.7 | 13.4 | 0.7 | 111.867 | 26.75 | 100 | 18.0 | |||
| QY NPK+OM | N, P, K fertilizers and organic matter | 5.8 | 21.3 | 17.7 | 18.7 | 111.867 | 26.75 | 100 | 18.0 | |||
| Duolun(DL), Inner Mongolia | Chestnut soil | DL N8 | Urea fertilizer | 6.4 | 46.5 | 3.0 | 7.6 | 116.289 | 42.041 | 1324 | 2.1 | Shen et al., 2011 |
| Fengqiu(FQ), Henan, Different fertilizations | Sandy loam soil | FQ NK | N plus K fertilizers | 8.4 | 7.4 | 5.4 | 35.2 | 114.400 | 35.000 | 67.5 | 13.9 | Shen et al., 2008 |
| FQ PK | P plus K fertilizers | 8.5 | 8.4 | 4.7 | 2.4 | 114.400 | 35.000 | 67.5 | 13.9 | |||
| FQ NP | N plus P fertilizers | 8.3 | 9.5 | 4.3 | 33.4 | 114.400 | 35.000 | 67.5 | 13.9 | |||
| FQ OM | Organic matter | 8.5 | 16.7 | 5.5 | 4.9 | 114.400 | 35.000 | 67.5 | 13.9 | |||
| FQ CK | No fertilization | 8.7 | 7.3 | 6.1 | 6.5 | 114.400 | 35.000 | 67.5 | 13.9 | |||
| FQ NPK | N,P,K fertilizers | 8.4 | 9.8 | 4.7 | 22.6 | 114.400 | 35.000 | 67.5 | 13.9 | |||
| FQ 1/2OMN | 1/2(N,P,K fertilizers plus organic matter) | 8.5 | 12.8 | 5.2 | 10.9 | 114.400 | 35.000 | 67.5 | 13.9 |
a
Sample name was designated as the sampling location, followed by the treatment.
b
Fertilization abbreviation: chemical fertilizer nitrogen (N), phosphorus (P) and potassium (K). “-” no data.