在桉类中,赤桉(Eucalyptus camaldulenis)的天然分布最广。赤桉被当作外来种而加以广泛栽植,为工业与家庭提供木材产品。在种源的水平上,在生长量、材性、叶子含油量及耐旱、耐盐或耐霜方面业已发现存在着相当大的变异。种源内的变异亦很重要,它正通过优良单株的选择被日益利用,以根插的方式用于大量繁殖,并用于提高种子园的种子产量。倘若该珍贵树种的所有遗传潜力和经济潜力被认识到的话,那么,基于范围广大的种源的种子而开展得很好的试验的资料就至为重要了。 Among the eucalyptus species, Eucalyptus camaldulenis has the most natural distribution. Eucalyptus is widely planted as exotic species and provides wood products for industry and households. At the provenance level, considerable variation has been found in growth, materiality, leaf oil content, and drought, salt, or cream resistance. Variations within the provenance are also important, and are being increasingly utilized through the selection of good individuals, multiplied by root insertion and used to increase seed yield in seed orchards. If all the genetic and economic potential of this precious tree species are recognized, then it is of paramount importance that trials of well-developed seeds based on a broad range of provenances be of crucial importance.