目前世界上有些国家利用经种源选择的亲本进行杨树杂交育种。而利用经选择的亲本个体进行杂交的国家不多,这方面研究较系统的国家是意大利,他们对黑杨派树种已有一整套的亲本选择程序。我国杨树杂交育种目前在选用亲本时仍还停留在“种”级水平,未考虑种内不同个体间的差异可能对杂交效果的影响,从而不能提高杂交育种效果。因此, At present, some countries in the world make use of provenance-selected parents for poplar cross breeding. However, there are not many countries that make use of the selected individuals to breed. The more systematic country in this respect is Italy. They have already had a complete set of parents selection procedures for Black Poplar trees. Poplar hybrid breeding in our country is still at the “seed” level at the time of selecting the parents, and the effect of the differences among different individuals within the species on the hybridization effect can not be considered, and the effect of hybrid breeding can not be improved. therefore,