Variation of Agricultural Climate Resources in Shuozhou of Shanxi in Recent 53 Years

According to the data of temperature,precipitation,the beginning of frost,the end of frost,frost-free period,≥0 ℃ and ≥10 ℃ accumulated temperature from Shuozhou Meteorological Bureau in Shanxi Province during the period of 1957-2009,the climate change in Shuozhou city was analyzed.The results showed that the precipitation in Shuozhou decreased,but the temperature increased.Along with annual mean temperature's increase and precipitation's remarkable reduction during 1998-2009,the date for the beginning of frost was obviously postponed;and the date for the end of frost presented stable and early trend.The frost-free time presented prolonged tendency.The accumulated temperature of ≥0 ℃ and ≥10 ℃ presented increase trend.These changes will affect layout and structure of the local agricultural production.