气候变化背景下河北夏玉米生长季热量资源利用率时空变化

韩耀杰, 彭记永, 张溪荷, 李树岩

Spatial and temporal variations of heat resources utilization efficiency of summer maize in growth season under climate change in Hebei Province

HAN Yaojie, PENG Jiyong, ZHANG Xihe, LI Shuyan

图2 1981—2019年河北省夏玉米生长日数（a）及生长日数利用率（b）变化 （阴影区域实线表示线性回归模型的拟合值，通过α=0.05的显著性检验。下同）

Fig.2 Variation of growing days （a） and its utilization rate （b） of summer maize from 1981 to 2019 in Hebei Province （The real line in the shadow region represents the fitting value of the linear regression model， passing α=0.05 significance test. the same as below）