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在油松无性系种子园初果期,园内花粉密度随树龄的增加急剧增大。5月初开始散粉,散粉期一般持续15～20天。散粉期内早晨、下午花粉很少,晚上几乎收集不到花粉,一日内花粉密度的最大值在8～12时出现。散粉的适宜温度为12～15℃,相对湿度为50～70%。山坡上部花粉密度最大,下部密度最小。以距地面高1.5米处花粉密度最大,占43.3%,3米处次之,6.0米处最小,占18.7%。据观测,该种子园在散粉期内,多南风或偏南风,频率达60～80%,收集花粉总数占42～52.4%,故当地花期以主风向对花粉飞散影响较大。
In the early fruiting period of Pinus tabulaeformis seed orchard, the pollen density in the garden increased sharply with the increase of tree age. In early May loose powder, loose powder period generally lasts 15 ~ 20 days. Sowing powder morning, the afternoon pollen rarely, almost no pollen collected at night, within a day the maximum pollen density occurs at 8 to 12 o’clock. The appropriate temperature of loose powder 12 ~ 15 ℃, relative humidity of 50 ~ 70%. The pollen density is the highest in the hillside and the lowest in the lower part. Pollen density was the highest at the height of 1.5 meters from the ground, accounting for 43.3%, followed by 3 meters and the smallest at 6.0 meters, accounting for 18.7%. According to observation, the seed orchard in the loose powder period, more southerly or southerly winds, the frequency of 60 to 80%, the total number of collected pollen accounted for 42 ~ 52.4%, so the local flowering to the main direction of the greater impact on pollen flying.