In order to find out the difference between juvenile and mature wood of Populus simonii×P.nigra,this paper compared their chemical composition,fiber morphology and the pulping property.The results showed that the contents of phenethyl alcohol extractives,cellulose and lignin in the juvenile wood were higher than those in the mature wood,the holocellulose contents in the juvenile wood were lower than those in the mature wood.The fiber length in the juvenile wood was lower than that in the mature wood.Adoptin...