树木遗传选种是一门新兴的生物科学,历史比较短,研究树木的遗传和变异,为林业生产提供良种。每种树木具有复杂的遗传性和变异性,实验指出树木良好的和不良的特性和特征主要是由遗传决定的,由于内部组织的改变,在后代中常常出现不同于亲本的类型,形成新的变种或品种。达尔文曾经指出,“光桃(油桃)是毛桃产生的”。多年来我们在林木培育的过程中也发现同样的情况。许多一科一属一种的树种,如银杏, Tree genetic selection is a new biological science, history is relatively short, the study of genetic and variation of trees, provide a good variety for forestry production. Each tree has a complex heredity and variability. Experiments show that the good and bad characteristics and characteristics of trees are mainly determined by the heredity. Due to the changes of the internal tissues, the types of the trees different from the parents often appear in the offspring to form new Varieties or varieties. Darwin once pointed out that “light peach (nectarine) is a peach produced.” Over the years we found the same situation in the process of forest cultivation. Many one family is a genus of species, such as ginkgo,