长白落叶松种子园花粉飞散规律的研究

1992年4月末在黑龙江省林口县青山林场种子园进行试验研究,其结果表明:长白落叶松散粉历时8d左右,主要集中在第2～5d。种子园内每天的散粉量除了与各无性系植株的雄球花发育程度及散粉量有关外,还与环境因子有关,早晚散粉量主要受温湿度的控制,到9时后随着气温升高,散粉量还受风速的影响。一天内的散粉量主要集中于9～15时。花粉密度的空间立体变化,在垂直方向由高到低呈现由小到大的变化趋势;在水平方向上花粉分布也不均匀,在5个区中,第2、4区明显高于其它3个区。

RULES OF POLLEN DISPERSAL IN SEED ORCHARD OF LARIX OLGENSIS

The study on pollen dispersal of larix olgensis were carried at Qingshan Forestry Farm, Linkou County, Heilongjiang province in 1992. The results show that the pollen shedding periods are about eight days, and concentrate mainly in the second-fifth day.The daily pollen shedding amount is not only related to the developmental degree of male flowers and the pollen shedding amount of cach clone, but also related to the environmental factors. In the morning and evening, the humidity, but after nine o'clock,with the temperature going up, the wind velocity becomes the key factor, the daily pollen shedding concentrates mainly in 9-15 o'clock. The three-dimensional space change of pollen density is from thin to dense when the vertical direction the pollen distributino is also uneven. Among the five blocks, the pollen density in the second and the fourth block is significantly higher than that of other three blocks.