【摘要】 为了进一步明确长白山区几种典型落叶乔木物候对气候增暖的响应,利用1981—2009年该地区25个气象站日平均气温,6个农业气象站3种典型落叶乔木—榆树(Ulmus pumila)、小叶杨(Populus simonii)、加拿大杨(P.canadensis)、杏树(Prunus armeniaca)物候期资料,采用线性倾向估计、相关分析、一元线性回归等方法,分析物候变化及其对气候增暖的响应。结果表明:1981—2009年,长白山区3种典型落叶乔木的平均展叶始期、展叶盛期呈不显著提前趋势,平均叶黄末期、落叶末期以0.304～0.307 d/a速度呈极显著推后趋势。≥0℃积温是影响春季物候的主要因子,3月上旬—4月中旬是气温影响展叶始期的最优时段,该时段气温每上升1℃,展叶始期提前2.41 d;≤10℃积寒是影响秋季物候的主要因子,9月中旬—10月上旬是气温影响叶黄末期的最优时段,该时段气温每上升1℃,叶黄末期推后2.38 d。更多还原

【Abstract】 In order to further clarify the response of phenology of several typical deciduous trees to climate warming in Changbai Mountains, we used daily average temperature data at 25 weather stations and phenology data of Ulmus pumila, Populus simonii, Populus canadensis, Prunus armeniaca at six agricultural meteorological stations during 1981-2009, the phenological change and its response to climate warming were analyzed by linear trend estimation, correlation analysis and linear regression. The results showed that there was no significant advanced trend of the average first leaf unfolding and mid leaf unfolding, while there was significantly delayed trend of the average leaf fully coloring and leaf fully defoliation at a speed of 0.304-0.307 d/a of three typical deciduous trees in Changbai Mountains during 1981-2009. Accumulated temperature of ≥0 ℃ was the main temperature factor affecting spring phenology, the optimum period for temperature to affect the first leaf unfolding was from early March to mid-April, the temperature in this period rose by 1 ℃, and the first leaf unfolding was 2.4 d earlier. Cold accumulation ≤10 ℃ was the main temperature factor affecting autumn phenology, the optimum period for temperature to affect the leaf fully coloring was from mid-September to early October, the temperature in this period rose by 1 ℃, and the leaf fully coloring was 2.38 d delayed.更多还原