一、前言 当前我们用来建立林木种子园的优树,绝大多数是按其表型选择的。现代遗传学认为,生物的表型是由遗传和环境两个因素共同作用而形成的。为了鉴定优树遗传特性的好坏,进行留优去劣的再选择,以提高种子园的质量,必须对优树进行后代测定。后代测定方法主要分有性后代测定和无性后代测定两大类,而针对不同树种和不同繁殖方法 I. Preface At present, the best trees we use to establish tree seed orchard are mostly chosen according to their phenotypes. Modern genetics believes that biological phenotypes are formed by a combination of both genetic and environmental factors. In order to identify the superiority and inferiority of the superior tree genetic characteristics, to re-select the superior to inferior, in order to improve the quality of the seed orchard, the superior tree must be measured offspring. The offspring determination method is mainly divided into two major categories of sexual offspring determination and asexual offspring determination, and for different species and different breeding methods