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在国际林协第17届世界大会的“开花生理”专题讨论会上,有关种子园管理方面的研究报告中,曾有美国苏格兰陆地生态研究所朗曼(K. A. Longman)发表的《矮化密植早结实种子园的可行性》一文。一般的种子园有建园时间长,树形高大,种子采收不便,许多树种产量不稳定,以及各方面遗传性状不一定都可取等等缺点。据朗曼等报道,现在对桦木、扁柏、柳杉、柏树、落叶松、红杉、金钟柏、榆树等树种有可能采用人工促进开花的方法,提早结实并调节结实量。因此,即使植物个体还相当矮小(包括嫁接苗、扦插苗,甚至实生苗),也有可
At the “Flowering Physiology” Symposium of the 17th IAAF World Forestry Congress, a study report on the management of seed orchards has been published by KA Longman of the Institute of Terrestrial Ecology in the United States of America Feasibility of Seed Orchard ". General seed garden has a long park, tall tree, the harvest of seeds inconvenience, many tree species yield instability, and all aspects of genetic traits may not be desirable, and so shortcomings. According to reports from Longman et al., Birch, cypress, cedar, cypress, larch, sequoia, thuja, elm and other tree species are now likely to be artificially infested with flowering to achieve earlier fruiting and regrowth. Therefore, even if the individual plant is quite small (including grafted seedlings, cutting seedlings, or even seedlings), but also