杉木种子园内花粉飞散的观测与分析

Observations and Analyses of the Pollen Dispersal in the Seed Orchard of Cunninghamia lanceolata

1989～1990年对贵州黎平县东风林场7～11年杉木无性系种子园花粉飞散作了观测。结果表明:杉木种子园散粉历时7～9d,但90％以上的花粉集中在2～4d散出;一天中花粉浓度的高峰值多出现在9～13时,最大浓度可达1500～2000粒/cm^2·h;花粉浓度的方位差异与主风方向有关;在树高范围内,花粉浓度有由下至上增加的趋势;当大气相对湿度低于75％,风速大于3m/s时,花粉易散出,也易抬升.

The pollen dispersal in the clonal seed orchard of 7 to 10 year old Cunninghamia lanceolata was observed on the Dongfeng Forest Farm in Liping County, Guizhou Province during 1989 and 1990. The duration of the pollen dispersal was 7 to 9 days, but more than 90％ of the pollen was released during a 2 to 4 day period. The daily peak pollen dispersal occurred between 9:00 a.m.～1:00 p.m., with the highest density between 1500～2000 pollen/cm^2·h. Recorded pollen samples correlated with the prevailing winds. Within the tree height, there was a trend for pollen density to increase with height. When the humidity was less than 75％ and the wind speed greater than 3m/s, the pollen dispersion was at its peak.