中文摘要：

基于25年物候观测数据,分析了东北地区木本植物物候的时空变化特征,阐述了近25年来东北地区气候变暖对植物物候的影响,结果表明：1980—2005年,东北地区木本植物展叶初期主要呈提前趋势,提前幅度为0.23d·a^-1,枯黄初期主要表现为推后趋势,平均推后0.19d·a^-1,生长季延长,平均延长幅度为0.30d·a^-1;东北地区广泛分布的5种木本植物（旱柳、杏树、小叶杨、榆树和紫丁香）物候在地理空间上存在显著差异：纬度平均每增加1°,展叶初期推后3d,枯黄初期提前1.35d,生长季长度缩短4.41d;东北地区植物展叶初期与2、3、4月的气温显著负相关（P〈0.05）,其中,4月气温对植物展叶提前的影响最大,展叶提前趋势平均为2.35d·℃-1;2月气温的影响最小,平均趋势为1.18d·℃-1。

英文摘要：

Based on 25 years phenological observation data,the spatiotemporal characteristics of woody plants phenology in Northeast China were analyzed,and the effects of regional climate warming on the plant phenology were explored. In 1980-2005,the initial stage of leaf-developing of the woody plants in Northeast China advanced 0.23 d·a-1,but that of leaf-yellowing postponed 0.19 d·a-1. Consequently,the growth season prolonged 0.30 d·a-1. Spatially,the phenological characteristics of five widespread woody plants （Salix matsudana,Prunus armeniaca,Populus simonii,Ulmus pumila,and Syringa oblata） were significantly different,i.e.,with an average increase of 1° of latitude,the initial stage of leaf-developing tended to be postponed 3 d,that of leaf-yellowing advanced 1.35 d,and the growth season tended to be shortened 4.41 d. The initial stage of leaf-developing of these plants was significantly negatively correlated with the air temperature in February,March,and April （P0.05）,and the air temperature in April had the greatest effect,with the initial stage of leaf-developing advanced 2.35 d·℃-1 on average. On the contrary,the air temperature in February had the least effect,with the average tendency being 1.18 d·℃-1.