【摘要】 10个北美红杉种源幼树的物候及年生长节律的研究表明,该树种随气候因子的变化而出现有规律的萌芽、展叶、抽梢和落叶等物候现象。一般萌发期为2月中旬至3月下旬,部分新梢因萌发过早而有在霜期内受冻现象。北美红杉在滇中地区全年均在生长,没有明显的休眠期,只因各月气温及降水的变化而生长速度不同,生长量出现较明显的季节性。10个北美红杉种源幼树树高生长的高峰期和地径生长的高峰期基本一致,出现在5月、6月、7月、8月、9月份。高生长最快的是第三季度,即7月、8月、9月份,其高生长量均超过全年总生长量的35%。更多还原

【Abstract】 The experimental results of phenophase and growth rhythm of Sequoia sempervirens showed that as the change of climatic factors, a series phenophase phenomena such as budding, leafing, shooting and falling emerged orderly. The general budding period was mid February to the end of March, owing to the early budding, some new shoots were damaged by frost. Sequoia sempervirens showed the growth over the whole year in mid-Yunnan, without obvious dormancy. The growth speed varied with the temperature and rainfall of different months. The time of peak growth of ten provenances was similar, from May to September. The height growth of July to September accounted for 35 % of the total year at least.更多还原