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4 1961 -2018年华北地区初、 终霜日、 无霜期和平均气温变化趋势的空间分布

Fig.4 Spatial distribution of trends of the first frost date, the last frost date, frost-free period and the average temperature in the North China from 1961 to 2018