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1963—2018年中国垂柳和榆树开花始期积温需求的时空变化
陶泽兴1(), 葛全胜1,2, 王焕炯1()
Spatio-temporal variations in the thermal requirement of the first flowering dates of Salix babylonica and Ulmus pumila in China during 1963-2018
TAO Zexing1(), GE Quansheng1,2, WANG Huanjiong1()

图5. 贵阳(a、b)、西安(c、d)和牡丹江(e、f)垂柳和榆树开花始期的积温需求与冷激日数的关系
注:slope1、slope2和slope3分别为GDD、GDDS和GDH算法的积温需求变化趋势。

Fig. 5. Relationship between the thermal requirements and chilling days for the first flowering dates of Salix babylonica and Ulmus pumila in Guiyang (a, b), Xi'an (c, d) and Mudanjiang (e, f)