关键词: 突变, 深层地温, 河西走廊

Abstract: The climate change and its effect are the widespread concern hotspot in today's international society. The Hexi Corridor Region of Gansu Province，China is the climate change sensitive area and ecological environment fragile area. In recent 31 years，the trend of climate warming is clear in Hexi Corridor Region，but the study about the ground temperature of Hexi Corridor Region has not been reported.  The paper is aimed at investigating the characteristics and regularity of temperature change and the response to air temperature in Hexi Corridor Region in the almost 31 years，according to the monthly ground temperature data for 80 cm，160 cm，320 cm of Jiuquan，Zhangye and Wuwei whose ground temperature data are the most complete and geothermal observation time are the longest in Hexi Corridor Region from January 1980 to February 2011，at the same time，the paper uses linear fitting，moving average and Mann-Kendall climatic statistical methods to carry on trend and mutation analysis to reveal its response to climate change. Studies show that the ground temperatures for 80 cm，160 cm and 320 cm were significant fluctuation trend in recent 31 years in the Hexi Corridor Region，and warming rate of ground temperature is maximum in summer，the second in spring and the minimum in winter，the increasing rate of ground temperature for 80 cm is 0.91 ℃/10 a，the ground temperature for 160 cm and 320 cm increasing rate of 0.85 ℃/10 a and 0.69 ℃/10 a in summer （three ground temperature linear increasing rates were gone through 0.01 significant test）. The ground temperature year time series present 3 a cycles，and appear the early cold and late warm evolution trend，linear warming rate significantly.  The increasing rate of 80 cm ground temperature is 0.55 ℃/10 a，warm mutations appeared in 1994； 160 cm ground temperature increasing rate is 0.59 ℃/10 a，warm mutations appeared in 1995；320 cm ground temperature increasing rate is 0.60 ℃/10 a，warm mutations appeared in 1996. The results show with the increase of depth，warm abrupt emergence time of the year deep ground temperature has lag phenomenon. The effect of air temperature on deep ground temperature is obvious，the deep ground temperature is increasing with the air temperature rising，the positive correlation coefficient is 0.862 of the annual average air temperature and annual average ground temperature of 80 cm （through 0.01 significant test）. The annual average temperatures with annual average ground temperatures of 160 cm and 320 cm also have the same change tendency，correlation coefficients are 0.821 and 0.789 （through 0.01 significant test）. With the depth increase，the correlation of air temperature and ground temperature decreases slightly，which is due to the deep ground temperature change lags.

Key words: mutation, deep ground temperature, the Hexi Corridor