Table 1 The natural conditions of two progeny trials.
Hubei | Liaoning | |
|---|---|---|
Latitude | 30° 48' | 42° 02' |
Longitude | 110° 3' | 124° 50' |
Elevation (m) | 1600–1800 | 300 |
Mean annual rainfall (mm) | 1500–1800 | 780 |
Soil type | Yellow brown soil of mountain | Brown forest soil of mountain |
Mean annual temperature | 9 °C | 4.6 °C |
Extremely low temperature | −10 °C | −37.6 °C |
Extremely high temperature | 29 °C | 36.5 °C |
The climatic type | Northern subtropical zone | Continental monsoon climate |
Annual accumulated temperature ≧10 °C (°C) | 2200–2300 | 2720.3 |
Annual sunshine hours(h) | 1532.9 | 2433 |