实现树木良种化的程序 (一)、树木的人工选择树木改进的基础是遗传的差异,有遗传的差异,才能选择和利用。优树选择是在于选择真正具有良好的遗传型,表现十分突出的优良个体(或群体)的树木。所以选优是一个长期的连续过程。一般分作三步:表现型选择、后代测定和遗传型选择。目前,我国的优树选择处于表现型选择向后代测定过度阶段。选择的种类,有种间差异的选择、本地种源的选择、最适宜生态型的选择、群体选择、单株选择等。表现型是基因型和环境条件共同作用的结果,所以单从表现型进行选择,难免产生盲目性。为了提高选优的 Program to achieve the tree seed (A), the artificial selection of trees The basis for improvement of the tree is genetic differences, there are genetic differences in order to choose and use. Tree selection is the choice of truly good genetic type, the outstanding performance of the outstanding individuals (or groups) of trees. Therefore, the election is a long-term continuous process. Generally divided into three steps: phenotype selection, offspring determination and genetic selection. At present, the optimal tree selection in our country is in the phenomenal selection of phenotypic transition to the offspring. The type of selection, the choice of species differences, the choice of local provenances, the choice of the most suitable ecological type, group selection, individual selection and so on. Phenotype is the result of a combination of genotypes and environmental conditions, so the choice of phenotype alone inevitably leads to blindness. In order to improve the selection of the best