摘要
华北落叶松雌雄花芽于 6月中旬到 7月上旬分化 ,9月中旬雌球花芽顶部变得比雄球花芽尖而光滑 ,且芽鳞向外反卷 ,而雄球花芽的芽鳞未反卷 ,这些可作为雌雄球花花芽早期识别的重要特征。雌雄球花在树冠不同方向和部位的分布是不同的 ,其球花的数量比例为 1 :4～ 1 5 ,它们的开花百分率分别为 85 %和 70 %。
The female and the male flower of Larix principis-rupprechtii mayr.differentiates from the middle ten days of June to the first ten days of July.In the middle ten days of September,the top of female bus is much more sharp and smooth than that of male one and yts bud scale curls towards out side,but male bud doesn't.These can be regarded as an important character to disting uish bet ween th female and the male bud in early stage.The distribution of female and male cone is different in every direction and position of crown.The ratio between female cone amount and male cone amount is about 1:4～5.The flowering percentage of theirs respectively are 85% and 70%.
关键词
华北落叶松
球花
特性
Larix principis-rupprechtii Mayr.
None
Characteristic
