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, 葛全胜, 王焕炯

Spatio-temporal variations in the thermal requirement of the first flowering dates of Salix babylonica and Ulmus pumila in China during 1963-2018

TAO Zexing, GE Quansheng, WANG Huanjiong

表2 基于时空耦合样本的冷激日数—积温需求模型公式

Tab. 2 The equations of chilling day-thermal requirement models based on spatio-temporal mixed sample

物种	积温需求算法	公式	R²	RMSE(°C·d)	P
垂柳	GDD	F=92.17+502.79×e^-^C^/24.29	0.66	84.09	< 0.01
	GDDS	F=122.47+428.79×e^-^C^/34.99	0.60	85.09	< 0.01
	GDH	F=110.98+461.55×e^-^C^/20.43	0.54	94.00	< 0.01
榆树	GDD	F=36.30+774.01×e^-^C^/15.89	0.64	29.75	< 0.01
	GDDS	F=68.27+363.21×e^-^C^/30.04	0.40	33.01	< 0.01
	GDH	F=29.82+132.32×e^-^C^/47.74	0.33	32.32	< 0.01