近46年临汾浅层地温气候特征分析

利用临汾1962年～2007年0cm～20em各层逐月平均地温，采用气候倾向率、滑动t检验等气候统计方法，研究了近46年临汾浅层平均地温的变化趋势、异常年份和气候突变等．结果表明：近46年来临汾各季节浅层平均地温均呈现为显著的变化趋势（-0．07 ℃／10a～0．53℃／10a），春季最大，夏季最小；各浅层年平均地温均呈明显的升高趋势，平均每1-年升高0．15℃-0．26℃，以表层地温增温率最大；春季、秋季和年浅层平均地温表现为“暖-冷-暖”的变化趋势；浅层地温春季、冬季多异常年份，年平均地温异常偏高发生在2000年后，异常偏低发生在1996年；用滑动t检验法和Yarnamoto法发现地温在1996年附近发生了突变，用M—k法发现地温在2002年附近发生了突变；气温升高是导致地温上升的主要原因．

The Analysis of Soil Temperature Features at Shallow Layers in Linfen from 1962 to 2007

The variation trend, anomalous years and abrupt change of annual and seasonal mean soil temperature at shallow layers during the period of 1962 - 2007 in Linfen were investigated by using modern statistical diagnostic methods such as linear trend analysis,the moving t-test method. The main results are as follows ： （ 1 ） in terms of linear trend, the seasonal mean soil tem- perature at shallow layers display a significant increasing trend in Linfen in past 46 years （ - 0.07℃/10 a - 0.53℃/10 a）, which is maximum in spring, minimum in summer; the annual mean soil temperature at shallow layers had a significant increasing trend, and the rising rate is 0.15 ℃/10 a-0.26℃/10 a, specifically at the depth of 0cm. （2） the change of mean soil temperature at shallow layers in spring ,autumn and year has a ＂warm-cold-warm＂ trend. （3） the anomalous years of soil temperature at shallow layers in linfen mainly happens in spring and winter;The annual mean soil temperature was anomalously high after 2000, anomalous lower year occurred in 1996. （4） the abrupt change of soil temperature happens in 1996 with moving t-test and Yamamoto method , while in 2002 with Mann-Kendall method. （ 5 ） the increase of the soil temperature is mainly caused by the significant increase of air temperature.