Abstract:

In this study, the wood of Poplar 72 (Populus×euramericana cv.Ⅰ-72/58), Poplar 63(P.deltoides cv.Ⅰ-63/51) and Poplar 69(P.deltoides cv.Ⅰ-69/55)grown in three different beaches(river beach, islet beach and lake beach) of the Yangtse River with three different row spacings(3m×4m, 4m×5m and 5m×6m)were selected as the materials. Based on the relationships beween wood properties and the cambium age(CA), the ring width (RW) revealed, the fiber length (FL), the microfibillar angle(FA) and the wood density (WD) varied with CA and RW were firstly quantitatively modeled with stepwise regression analysis methods. The results are as follows:FL=765.07+119.77CA-6.15CA²-1506.97(1/RW)+365.18(CA/RW)-18.02(CA²/RW)FA=9.643+0.061RW+2.376(1/CA)-0.201(RW/CA)WD=0.447-0.003CA+0.004(1/RW)+0.004(CA/RW)It was revealed from the results that FL of poplar plantation can be better predicted with above model of FL varied with CA and RW(r=0.989) and FA and WD within a poplar tree can also be better predicted with above models of FA and WD varied with CA and RW(r=0.209~0.909), except for the prediction of FA and WD(r=0.118~0.143) among different poplar trees.

Key words: Poplar plantation, Wood properties, Growth ring, Growth rate, Models of relationships between wood properties and CA and RW