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樟子松具有耐干旱瘠薄的生物学特性,已成为绿化风沙、干旱地区的重要树种,但其种源目前只限于大兴安岭山地及海拉尔一带沙地。由于自然条件限制,所产种子远远满足不了造林需要。为此我们本着自力更生精神,于1972年,先后从各樟子松林分中改建和采用移栽大树营造母树林700亩,用优质壮苗营造母树林8000亩。对上述不同类型母树林,加以集约经营,给以一定农业技术措施。经1979年调查,17～18年生移植的母树,一般单株产球果106～322个,亩产种子0.5斤,鲜果出种率1/100,种子千粒重7.5～8.0克,每斤种子合人民币16.00元。实践证明,对樟子松母树林采取一定综合技术措施,可提早获得优质高产种子,并可降低种子工本费。现将主要经营管理技术措施整理如下。
Pinus sylvestris var. Mongolica has the characteristics of drought resistance and infertility. It has become an important species of tree species in the aeolian sand and arid regions. However, the provenance of Pinus sylvestris var. Mongolica is only limited to the Daxinganling Mountains and the sandy land of Hailar. Due to natural conditions, the seeds produced far can not meet the needs of afforestation. To this end we have the spirit of self-reliance, in 1972, successively from the Pinus sylvestris forest in the transformation and the use of transplanting trees to create a mother tree 700 acres, with strong seedlings to create a mother tree 8000 acres. On the different types of mother trees, to be intensive management, to give some agricultural technical measures. According to the survey conducted in 1979, the mother trees transplanted from 17 to 18 years usually have 106 to 322 per plant per unit fruit, 0.5 kg per mu for seed production, 1/100 for fresh fruit and 7.5 to 8.0 g for 1000-grain seed, 16.00 yuan. Practice has proved that to take a certain amount of comprehensive measures on Pinus sylvestris var. Mongolica can get high-quality and high-yield seeds earlier and reduce the cost of seed costs. The main management and technical measures are summarized below.