| Influence of winter accumulation temperature to winter wheat's period of duration in East Gansu loess plateau |
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| DOI：10.7606/j.issn.1000-7601.2007.04.16 |
| Key Words: East Gansu loess plateau winter accumulation temperature winter wheat development period correlation analysis |
| Author Name | Affiliation | | XIN Ji-wu | Hainan Provincial Meteorological Bureau, Haikou, Hainan 570203 | | GUO Jiang-yong | Qingyang Municipal Meteorological Bureau, Qingyang, Gansu 745000 | | YANG Xiao-li | Pingliang Municipal Meteorological Bureau, Pingliang, Gansu 744000, China | | MA Peng-li | Pingliang Municipal Meteorological Bureau, Pingliang, Gansu 744000, China |
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| Abstract: |
| With the data of winter accumulation temperature in 15 weather stations from 1965 to 2005, and the data of winter wheat's development periods from 1981 to 2005 in three representative stations, the change course was analysed. The influence of winter accumulation temperature to winter wheat's period of duration was discussed by using the method of correlation coeffient computation and the contrast between typical years. The result indicated that the accumulation temperature has been positive departure since 2000, and the accumulation temperature increased at the rate of 4.5 ℃·d/a from 1965 to 2005.The growth period of winter wheat in East Gansu has become earlier since 1994. The correlation between accumulation temperature assumes and the winter wheat's development periods are negative. The correlation is the most obvious in Xifeng. Turning green is the most remarkable growth period, next is the earring period, then is setting-out period. |
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