山杨早期选择的研究

Study on the Early Selection of Populus Davidiana Dode

通过对33株山杨(Populus davidiana)优树生长、材性变异和早期预测的研究及对4年生山杨子代林生长稳定性的研究结果表明:山杨优树在10年之前变化大,10年之后平缓下来,5年时可达显著水平,10年时达极显著水平。山杨优树的选择效率是从大到小分布,随早期年龄的增大,选择效率下降。其生长性状以树高和胸径作为选择指标,纤维性状以木材密度、纤维长度作为选择指标。山杨子代年度间生长相关显著,表明生长稳定。4～5年间早期选择,对于短周期用材树种是可行的。

Thirty-three superior trees of Populus Davidiana Dode are studied in the growth,wood quality and early prediction.Their progeny plantations are tested in the growth stability.The results indicates that the growth of Populus Davidiana Dode varies greatly and increases fast before the age of ten years,it bates down after 10 years,it differs at 0.05 level significance at 5 years,0.01 level at 10 years.The selection efficient distributes from greater to less.It'll decrease as the age of Populus Davidiana Dode is older.The selec- tion criteria are the height and the D.B.H of growth traits,the density and fiber length of fiber traits.In the progeny plantation of Populuss davidiana Dode,there are significant cor- relation between each year growth rate,their growth was stability.It's available for short rotation wood to select as early as 4 or 5 years old.