中文摘要：

利用西南地区135个站1961—2005年的年、月气温资料,按海拔高差及地形气候特征划分成不同的三级地形台阶及4个分区,分析了不同分区的气温时空变化特征。结果表明：西南地区大部年平均气温表现出明显的增温趋势,上升趋势最显著的地区在西藏高原等高海拔地区,而在四川的东北部及云南北部存在降温中心。各分区四季的增温速率排序与全国平均情况有所不同,依次为冬季、秋季、夏季或春季,且均表现出冬季增温趋势明显大于其他季节的特性。各分区年平均气温20世纪60年代至80年代中期基本表现为明显的下降趋势或无明显的增减趋势,但自1997年以来,均表现出显著的增温趋势。突变检测的结果也表明,各分区年平均气温突变的区域或突变点大部分发生在90年代后期以后,且高海拔地区增温突变启动时间早于低海拔地区。

英文摘要：

Based on the annual and monthly mean temperature data at 135 weather stations in Southwest China from 1961 to 2005,and according to altitude,topographical and climatic features,Southwest China was divided into three terrains with different altitudes or four subregions,the spatial-temporal characteristics of temperatures for the four subregions were analyzed.The results show that the annual mean temperature exhibited a clear warming trend in most Southwest China,especially in the high altitude regions,such as Xizang Plateau,but cooling trends in northeast Sichuan and northern Yunnan.Seasonal warming rates for the four subregions were successively winter,fall,and summer or spring in a descending order,which is different from that of the national mean temperature rising rates;and warming trend in winter was clearly stronger than those in other seasons.Annual mean temperatures of each subregion showed a marked declining trend or no significant changes from the 1960s to the mid-1980s,but have shown a significant warming trend since 1997.The Mann-Kendall non-parametric test results of subregion annual mean temperatures show that the warming abrupt change occurred in the late 1990s;and the abrupt change time was earlier in high altitude subregion than those in lower altitude subregions.