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桉树是异花授粉树种。随着种类增加,花期重叠,常常出现天然杂种。杂种往往具有杂种优势。我所引种桉树时间较早,种类较多,于1975年品种对比试验林内,发现以柳桉和谷桉为母本的天然杂种。杂种的外观形态与母本差别较大,比母本纯种生长快1.5倍。因此,验证天然杂种父本,探讨杂交育种途径,以便育出大量具杂交优势种子供生产使用,这是林业工作者当前迫切的任务。我所于1977、1978年开展按树杂交育种试验,育得的种子,分别于
Eucalyptus is a cross-pollination tree species. With the increase of species, flowering overlap, often appear natural hybrids. Hybrids often have heterosis. I introduced eucalyptus earlier, more species, in the 1975 variety comparative test of the forest and found Eucalyptus and Eucalyptus as a natural female parent hybrids. The appearance of the hybrids differs greatly from that of the female parent, which is 1.5 times faster than the purebred female parent. Therefore, the verification of natural hybrids paternity, hybrid breeding methods to explore in order to bred a large number of hybrid seed for production use, which is the urgent task of forestry workers. I was in 1977, 1978 carried out by tree hybrid breeding test, breeding seeds, respectively