内蒙古大兴安岭生态功能区冷暖季节气候变化趋势分析

Analysis of the warm and cool season's climate variations in the ecological function sites in the Great Khingan,Inner Mongolia

利用内蒙古大兴安岭生态功能区8个站点近30 a的日气温数据分析了该地区年冻融指数变化趋势.结果表明:该生态功能区融化指数呈显著上升趋势,冻结指数波动变化但不显著;年>0℃天数呈增加趋势,<0℃天数则减少,都未达到显著水平;暖季日平均融化指数显著上升,冷季日平均冻结指数也呈增加趋势,其中2站点达显著水平,表明该地区暖季越暖,冷季亦变冷,气候呈两极化趋势;>0℃生长季初日全部提前,其中62.5%的站点达到显著水平,多数站点生长季推后,但只有1个站点达到显著水平,表明生长季延长初日提前贡献较大.

In this paper,daily temperature data from eight meteorological stations in the ecological function sites in the Great Khingan,Inner Mongolia from 1984 through 2014 were used to analyze the regional freezing-thawing index variations. The results show that the thawing index,the daily average thawing index had significantly risen;freezing index had varied in undulation;the duration of more than 0 ℃ had increased,and that of less than 0 ℃ had decreased,but both had not reached significant level. The daily mean thawing index in warm season had increased remarkably and the daily mean freezing index in cool season had increased with two sites reached significant level,show ing that in this region the warm season had become warmer and the cool season had become colder. The growing season had all brought forward,with 62.5% of the sites having reached significant level;the ending day of the growing season had mostly delayed（with only one site had reached significant level）,which indicates that the growth season beginning date bringing forward has more contribution to the growing season prolonging.