摘要
长白落叶松雌雄花．在水平枝上主要着生在第４、５、６年枝段上，在垂直方向上主要在第４年枝层以下的各层上。落叶松球果、种子及种子萌发性状的树木个体间差异较大．某些性状的相关关系紧密．如大球果脱粒出的种子大，种子的发芽势、发芽率高。高出林冠层的老龄树木空粒种子多。高海拔地段的林木受局部地型的生态因子影响种子发芽率低。位于树冠上部的种子发芽势、发芽率最高，中部次之．下部最低。受花粉密度垂直梯度变化的影响、树冠中上部的种子空粒率较高．下部较低。
In horizontal direction,the strobiles of Larix olgensis are mainly distributed on the 4th.sib and 6th yearly segments of branches.In vertical direction,the strobiles are mostly distributed on the branches below the 4th yearly layer.There are more differences in cones.seeds and seed germinations among the individuals and strong correlations exist between some traits.ror example,the bigger the cones、the larger their seeds、and the higher their germinating potential and germinating percentage.Older trees whose crown are above the layer of crown produce more empty seeds.Seeds of trees with high elevation have lower germinating percentage because of the influence of local ecological factors.Germinating potential and germinating percentage of seeds are high on the top.average on the middle,lower at the bottom of crown.Percentage of empty seeds is high on the middle and top of crownand is low at the bottom of crown.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1995年第2期7-13,共7页
Journal of Northeast Forestry University
基金
林业部主要造林树种开花结实规律及种子产量预测预报课题
关键词
长白落叶松
球果
种子
变异
Larix olgensis
Cones
Seeds
Variation
