迎春始花期预报方法的研究

Forecast of Beginning of Flowering Period of Winter Jasmine (Jasminum nudiflorum L.)

分析石家庄 1982～ 2 0 0 3年迎春始花期与气温资料发现 :迎春始花期与 2～ 3月气温呈明显负相关 ;迎春始花期所需 >0℃积温为 15 4 0℃·d ;近年来与冬季负积温呈负相关关系 ,此外近 2 0年间迎春始花期有明显提前趋势 。

The beginning of flowering period of winter jasmine (Jasminum nudiflorum L.) and temperature in Shijiazhuang from 1982 to 2003 were analyzed.The results showed that the beginning of flowering period of winter jasmine was significantly negative related both with the air temperature during February and March and with negative accumulated temperature in winter.The needed accumulated temperature for flowering of winter jasmine was 154 ℃.The beginning date of winter jasmine's flowering period became earlier significantly.Based on these results, the forecast model for the beginning of winter jasmine's flowering period was established.