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长白山温带针阔叶混交林作为典型的温带森林生态系统,对气候变化的反应比较敏感,其生长季及积温的变化是准确评价该我国东北林区气候变化的重要依据。本研究采用中国科学院长白山森林生态系统定位站获取的1982—2010年气温日值观测资料,分析了近20 a该地区生长季长度及积温的变化,结果标明长白山温带针阔叶混交林29 a的平均温度为3.6℃,29 a中该地区气温有较弱的上升趋势;长白山温带针阔叶混交林1990—2010年生长季长度的平均值为174 d,近20 a中生长季长度呈弱增长趋势;长白山温带针阔叶混交林1990—2010年生长季起始日期变化较稳定,生长季终止日期有推后的趋势;长白山温带针阔叶混交林1990—2010年≥5℃的活动积温和有效积温平均值分别为2 616.9℃、1 744.8℃。近20 a中,≥5℃活动积温和有效积温都有着缓慢升高的趋势。
As a typical temperate forest ecosystem, the temperate coniferous and broad-leaved mixed forest in Changbai Mountains is sensitive to climate change. The change of its growing season and accumulated temperature is an important basis for accurately evaluating the climate change in the northeastern region of China. In this study, daily observation data of temperature from 1982 to 2010 obtained from the Changbai Mountain Forest Ecosystem Positioning Station of Chinese Academy of Sciences were used to analyze the change of growth season length and accumulated temperature in this region in the past 20 years. The results showed that in the temperate coniferous and broad-leaved mixed forest of Changbai Mountain for 29 years The average temperature was 3.6 ℃, and the temperature in this area had a weaker rising trend in 29 years. The average growth period of the temperate coniferous and broad-leaved mixed forest in Changbai Mountains from 1990 to 2010 was 174 days, and the growth season length showed a weak growth in the past 20 years The trend of change of the start date of the growing season in the temperate coniferous and broad-leaved forest in Changbai Mountains from 1990 to 2010 is relatively stable, and the ending date of the growing season has a tendency of postponement. The active accumulated temperature of ≥5 ℃ in temperate coniferous and broad-leaved mixed forest in Changbai Mountains from 1990 to 2010 The average effective accumulated temperature is respectively 2 616.9 ℃ and 1 744.8 ℃. In the recent 20 years, active accumulated temperature and effective accumulated temperature ≥5 ℃ all showed a slowly increasing trend.