利用1961～2005年云南景洪0～20 cm各层逐月平均地温，采用气候倾向率、累积距平、信噪比等气候统计方法，研究了近45年西双版纳浅层平均地温的变化趋势、气候突变和异常年份等。结果表明:各年、季浅层平均地温均呈现极显著的升高趋势，升温率为0.14～0.40 ℃/10a，春季最小，冬季最大，年和春、冬两季表层升温率最大。各浅层平均地温在1980年秋季均发生了突变，冬季突变出现在1978年，以突变点划分，前为冷期，后为暖期，0 cm、15 cm和20 cm年平均地温，突变前只有20 cm年平均地温增温趋势不显著，突变后则相反，只有20 cm年平均地温呈显著的增温趋势，这表明20世纪80年代以来，20 cm地温对气候变暖的响应更强。年平均地温除10 cm外均在1971年异常偏低，各浅层年平均地温2003年均异常偏高。气温升高是影响地温上升的主要原因。
The variation trend，abrupt changes and anomalous years of annual and seasonal mean soil temperature at shallow layers from 1961 to 2005 in Xishuangbanna, Yunnan Province are investigated by using the statistical diagnostic methods such as linear trend analysis，accumulated variance and signalnoise ratio. The results indicate：(1) In terms of linear trend，the seasonal mean soil temperature in the shallow layers displayed a significant increasing trend in Xishuangbanna in past 45 years with an increase rate of 0.14 to 0.40 ℃/10a, maximum in winter，minimum in spring. The interdecadal variations of the annual and seasonal mean soil temperature in the shallow layers had an obvious increasing tendency, especially in winter and spring. (2) The abrupt changes of mean soil temperature in various layers occurred in autumn of 1980，and the abrupt changes in winter appeared in 1978; the period before the abrupt change is colder and the period after is warmer. Before the abrupt change, only annual mean soil temperature at 20 cm kept the same increasing trend, but a significant increasing trend after the abrupt changes, which shows that the annual mean soil temperature at 20 cm response to climate warming more sensitively since the 1980s. (3) Except that the annual mean soil temperature at 10 cm was anomalously lower in 1971，anomalously higher temperature occurred in 2003 at the other shallow levels. The results proved that the significant increase of air temperature is the main cause of the increase of soil temperature.