江苏省晚霜冻时空演变特征和茶树早春冻害分级的探讨

利用江苏省35个气象站1961～2008年的气象观测资料分析了晚霜冻的时空演变特征。结果表明:江苏省终霜冻期北部迟于南部,最早和最晚终霜冻期相差达20 d;近48年来,全省终霜冻期呈明显提早的变化趋势;各区终霜冻期均在20世纪90年代后期发生了气候突变。笔者还分析了江苏省早春茶树冻害的类型,并用隶属函数值域划分了早春茶树冻害的级别,取得了理想的效果。

Space-time Evolvement Characteristics of Late Frost and Classification of Early Spring Freezing Injury to Tea Plant in Jiangsu Province

The space-time evolvement characteristics of late frost in Jiangsu province were analyzed by using the meteorological data of 35 stations of Jiangsu province from 1961 to 2008.The results showed that the end frost date in northern Jiangsu province was later than that in the south,and the earliest and latest end frost date had a gap of 20 days.In the recent 48 years,the end frost date showed obvious ahead tendency in whole province.The climate saltation of the end frost date was found in each region in the late 1990s.This paper also analyzed the type of early spring freezing injury to tea plant in Jiangsu province,tried to classify the early spring freezing injury to tea plant by the threshold of membership function,and it had achieved an ideal result.