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
表1 1961 -2018年华北地区及各区域初霜日、 终霜日和无霜期的变化趋势
Table 1 Trends of the first frost date, the last frost date and frost-free period in North China and the three sub-regions during 1961 -2018
时期变化趋势/[d·(10a)-1]
华北地区京津冀地区山西省内蒙古自治区
初霜日期1.50**1.18**1.51**1.72**
终霜日期-2.32**-2.49**-2.03**-2.44**
无霜期3.85**3.69**3.47**4.17**