关键词: 气候变化, 初终霜日, 无霜期, 积温

Abstract: Based on the meteorological data of eleven counties in Changzhi City from 1961 to 2000,the change characteristics of the mean temperature and precipitation was statistically analyzed.It was concluded that the climate was warming up in Changzhi City,in particular in the 1990s,and warming up in winter was most significantly.The precipitation was decreasing and with a significant trend from the beginning of 1977.Between 1977 and 1984 it experienced a period of spare precipitation and a fluctuated decrease from 1985 to 2000. The climate change led to an increase in drought events,in particular in midsummer in 1990s.The frequency of the rainstorm process decreased from 1980s,and significantly in 1990.From early 1980s,the first frost date advanced,but the late frost date was slightly late by 1.3 days each 10 years.The active accumulated temperature of ≥10℃ steadily increased.The frostless season had gradually extended since 1970s.These characters would affect the layout and structure of agricultural production and crop planting.

Key words: Climatic change, Climatic change, Girst frost date and late frost date, Frostless season, Accumulated temperature