秋冬气候变化对乌鲁木齐冬小麦播期的影响

通过对1976-2006年秋冬气候条件分析。得出鸟鲁木齐冬小麦冬前生长期间和越冬期间的气候条件发生了较明显的变化，表现为气温升高、降水减少、冬前〉0℃积温增加，越冬期初日后推，冬前生长期延长，越冬期间负积温减少。结果表明随着气候的变暖适当晚播更有利于冬小麦生长，冬小麦的适宜播种期应在传统播种期的基础上向后推迟一候左右。

The Influence of Fall and Winter Climatic Change on Winter Wheat Seeding Date in Urumqi

the fall and winter climatic change are analyzed from 1976 to 2006 in this paper, and it shows that the climatic conditions has noticeable change during the growth period before winter and the wintering period for winter wheat in Urumqi. These changes presented as rising temperature, decreasing precipitation, the accumulated temperature （0℃） before winter to be overmuch, the beginning date of winter to be later, the growing period before winter to be lengthened, the negative accumulated temperature in wintering period to be decreased. Under this climatic condition, if we continue to plant winter wheat in earlier seeding date, it would make the winter wheat grow to excess and lower the ability to resist cold injury in winter and would decrease the yield and quality of winter wheat. So put off to plant winter wheat is good for growing under the present climatic conditions. It should defer five days by the tradition seeding date.