近58年华北地区初、 终霜日及无霜期变化特征分析

焦文慧,张勃,马彬,崔艳强,邢立亭,王晓丹,黄浩

Variation Characteristics of the Date of First Frost and Last Frost and the Frost-Free Period in North China in Recent 58 Years

Wenhui JIAO,Bo ZHANG,Bin MA,Yanqiang CUI,Liting XING,Xiaodan WANG,Hao HUANG

图6 基于不同基准气候期（左）和不同年代（右）的初、 终霜日和无霜期平均值地带的位置变化

Fig.6 Position change of the first frost date, the last frost date, frost-free period (based on mean of 1961 to 2018) of different baselines (left) and different decadal (right) in the North China