中文摘要：

为促进科尔沁沙地生态环境保护、农牧业发展、水资源合理开发利用等的顺利开展,本文利用1951-2012年科尔沁沙地气温资料,分析了该区气温突变特征及突变前后时空演变情况,结果表明：①时间上,年（季）最低气温首先发生突变（1981-1987年）,平均气温次之（1981-1994年）,最高气温最晚（1985-1999年）;冬、春、秋、夏季依次发生突变;②年最低气温突变后比突变前、冬季气温比夏季气温变化更剧烈;年、春（秋）季气温变化剧烈程度按最低、平均、最高气温依次减弱,冬季与之相反;③突变前春季最低气温升温速率为0.50℃/10a、突变后秋季最高气温升温速率为0.75℃/10a,二者对升温贡献最大;④突变前后多年均值增量最大为冬季最低气温（1.86℃）,气候倾向率增量最大为秋季最高气温（0.72℃/10a）;年内季节多年均值增量变化顺序与其增温速率增量变化相反;⑤空间上,年气温各要素突变后倾向率变化范围均较突变前增大,年最低气温突变后显著升温面积比突变前增大6.79%;突变后,除科左中旗地区平均气温外,自东向西沿新开河到西辽河以北地区升温速率大于以南地区升温速率。

英文摘要：

Based on temperature data from 1951 to 2012 we analyzed abrupt change features of temperature and temporal and spatial variation before and after abrupt temperature change. We found that year（season）minimum temperature changed（1981-1987）,followed by year（season）mean temperature（1981- 1994）,and then year（season）maximum temperature（1985- 1999）.Winter temperatures have changed more abruptly than summer temperatures;minimum temperature was more abrupt than mean temperature,mean temperature was more abrupt than maximum temperature in spring（autumn and annual）;winter shows the opposite pattern. Before the abrupt change in minimum temperature（0.50℃/10a）in spring,after the abrupt change of the maximum temperature in autumn（0.75℃/10a）,are the largest contributor to temperature rise.Across all of the elements of temperature before and after abrupt change,the largest incremental mean value for many years is the winter minimum temperature（1.86℃）and the smallest is annual maximum temperature（0.83℃）. The largest incremental climate tendency rate is the autumn maximum temperature（0.72℃/10a）and the smallest is the summer maximum temperature（-0.02℃/10a）. Seasonal order of incremental mean temperature value for many years before and after abrupt change is opposite to their incremental climate tendency rate. The value range of all annual temperature elements＇ climate tendency rates after abrupt change are wider than before abrupt change;the area of annual minimum temperature increasing significant abrupt change increased by 6.79% compared with their before abrupt change. For the Xinkai and Xiliao Rivers the warming trend is higher than for other regions after abrupt change,except for the mean temperature for the Horqin Left Wing Middle Banner region. This study not only has a practical guide on ecological environment, farming and stockraising development, water resources development and utilization and and so on production and fliving but also has a certain scientifi