青河1961—2008年霜冻的气候特征和变化规律分析

通过分析1961-2008年青河初（终）霜冻和无霜冻期序列，探讨了它们的变化趋势，结果表明：青河近48a来初霜冻以5d／10a的速度推迟，终霜冻以4d／10a的速度提前，无霜冻期以9d／10a的速度延长。初（终）霜冻、无霜冻期在20世纪80年代初发生了转折。20世纪60-70年代，初霜冻提前，终霜冻推迟，无霜冻期缩短；80年代以后初霜冻推迟、终霜冻提前，无霜冻期延长。这种变化趋势与气候变暖一致。

Analysis of Frost Climatic Features and Change Regulations from 1961 to 2008 in Qinghe

Based on the analysis of the sequence of the first, last and frostless period from 1961 to 2008 in Qinghe area, the thesis discussed their variation trend. The results indicated that in the past 48 years the first frost has postponed at the rate of 5d/10a, while the last frost occured earlier at the rate of 4d/10a, and the frostless period has prolonged at 9d/10a. The first, last and frostless periods met their shift at the early 1980s. From 1960s to 1970s, the first frost corned earlier and the last frost ended later, the frostless period shortened. After 1980s, the first frost delayed, the last frost ended earlier and the frostless period has prolonged, which is accordant with the theory of global warming.