实生选种是指对一些长期无性繁殖的树木,通过播种天然授粉种子,从大量实生后代中选择优良个体,进而选育新品种的方法。实生选种是一种历史悠久的选种方法,现有一些用材树种和经济树种的优良类型和品种,相当一部分是利用这种方法选育出来的。由于实生选种具有方法简便,见效较快等特点,因此在育种技术不断发展的今天,仍具有一定的实用价值。泡桐为一重要的速生用材树种,它的繁殖方法除播种育苗外,还可以采用多种方式,进行无性繁殖。在北方桐区,特别是对于像兰泡桐、楸叶泡桐和山明泡桐这一类结实较少的 Real selection refers to the long-term species of asexual reproduction of trees, by sowing natural pollination seeds, from a large number of selected offspring of fine individuals, and then breeding new methods. Seed selection is a long history of seed selection methods, the existing species of timber and economic tree species of fine types and varieties, a considerable part of the use of this method is bred out. Due to the characteristics of simple seed selection and rapid result, seed selection still has some practical value in the continuous development of breeding technology. Paulownia is an important species of fast-growing timber, its breeding methods in addition to sowing seedlings, but also can use a variety of ways for asexual reproduction. In the northern area of ​​Tong, especially for such as Paulownia, Catalpa bungei and Samuel, Paulownia this type less firm