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利用柳属和钻天柳属种间、属间杂交１５个杂种３９个杂交组合１５１个无性系材料，对木材基本密度的遗传变异情况进行了研究。结果表明，杂种间和无性系间，在木材基本密度上存在极显著（α＝０．０１）差异，其中属间杂种（旱柳×钻天柳）×旱柳平均木材基本密度达到０．４８８，显著（α＝０．０５）超过各杂种平均值；柳树杂种及无性系木材基本密度是受强遗传控制的，被研究群体的广义遗传力达到０．９２～０．９８，遗传变异系数为５．８６％～９．１３％；树高和胸径与木材基本密度遗传相关不明显，在该群体中可以选择出既生长迅速又具有较高木材密度的优良无性系；以１０％的入选率在该群体中选择可以得到１０．２９％～１５．４５％的遗传增益
The genetic variation of wood basic density was studied by using 15 clones and 151 clones of 15 hybrids and 151 clonal hybrids between Salix and Salix. The results showed that there was a significant difference (α = 0.01) in basic wood density between inter-specific and clonal hybrids. The average density of interspecific hybrids , Significantly (α = 0.05) more than the average value of hybrids; the basic density of willow hybrids and clones is controlled by strong genetic control, the general heritability of the studied population reached 0.92 ~ 0.98, the coefficient of genetic variation From 5.86% to 9.13%, the tree height and DBH were not significantly related to the basic wood density. In this population, excellent clones with rapid growth and high wood density could be selected. With a 10% Selection in this population yielded a genetic gain of 10.29% to 15.45%