论文部分内容阅读
美国林务局于1965年制订了黑樱(Prunus serotina Ehrh.)改良计划(Schreiner和其他人,1965)。Pitcher和Dorn(1967)提出了优良树(Superior tree)的估价和选择准则作为这计划的一个部分。田纳西流域工程管理局和东北部林业试验站的林业工作者和遗传学家也选择了黑樱优良表型。到1967年秋,这些优良树木已有一百株以上作了鉴定。 优良树选择对松树和其他针叶树的改良是公认的方法。为了测定此法是否对对黑樱同
The United States Forest Service in 1965 developed the Prunus serotina Ehrh. Improvement Program (Schreiner and others, 1965). Pitcher and Dorn (1967) proposed the evaluation and selection criteria for the Superior tree as part of this plan. The forestry workers and geneticists at the Tennessee Valley Authority and the Northeast Forestry Experiment Station also selected the excellent phenotype of P. sativa. By the autumn of 1967, more than one hundred of these fine trees had been identified. Good tree selection is an accepted method of improving pine and other conifers. In order to determine whether this method on the same black cherry