摘要
油松在嫁接后2—3年即开有雌花,雄花较雌花出现晚3—4年。雌、雄花量随年龄增长逐年增加,10年生时雄花量急剧增多。不同无性系花量变异很大,花量最多的无性系为最少无性系的倍数:雌花可达40倍,雄花可达86.6倍。种子园的花粉量在9—12年生时每公顷为7.05—10.8公斤,远未达到自然授粉的需要量。9—12年生的种子园雌花在树冠外围从上到下均有分布,以树冠中部较多,而雄花约有80%集中在树冠下半部。这些调查结果为种子园的经营管理,特别为花粉管理提供了依据。
The female flower of Pinus tabulaeformis began to blossom after 2~3 years of grafting,which 3~4 years earlier than male flower.Fem- ale and male flower number has been increasing year after year.Male flow- er number increased sharply at ten-year-old.There is greatly difference between maximum flower number and minimum flower number in various ase- xual generation.It is 40 times in female flower,and 86.6 times in male flo- wer.Pollen weight in seed archard is 7.05~10.8 kilograms per hectare at 9 ~12 year old,but which is far inferior to needs of natural pollination.Fem- ale flowers at 9~12 year old scatter all around the periphery of crown from the upper to the lower,but majority gather around the middle of crown 80 percent of male flowers gather around the half lower crown.The investigation result has provided scientific basis for management and administration of seed archard,especially for pollen management.
出处
《陕西林业科技》
北大核心
1989年第2期1-6,共6页
Shaanxi Forest Science and Technology