Table 1 Description of the study sites
Site | Soil type | Latitude longitude | Altitude | Temperate climate | Growing season |
|---|---|---|---|---|---|
Hainan (SY) | Latosol | N18°23′30″ E109°11′33″ | 9 m | 22–28 | April–November |
Henan (HN) | Yellow Brown Soil | N 31°49′52″ E114°04′ 79″ | 87 m | 25–34 | April–October |
Heilongjiang (HLJ) | Black Soil | N 45°97′82″ E128°75′40″ | 196 m | 24–30 | May–November |
Jiangsu (JS) | Yellow Brown Soil | N 31°35′49″ E 119°10′57″ | 8 m | 26–37 | April–October |
Guizhou (GZ) | Yellow Cinnamon Soil | N27°54′34″ E106°74′78″ | 1271 m | 20–34 | May–November |