Result shows that the trunk was short and the canopy shaped as the natural semicircle.
结果表明，主干较矮，树冠为自然半圆头形，冠幅略大于冠厚。
2
It shows the methods to calculate the trunk volume by different sectional ways and product calculation methods and programs, as well as relevant error ratios of timber volume.
给出了按不同的区分方法和求积算法计算树干材积的方法、程序及相应的材积误差率。
3
The experiment shows that poplar's frost crack could prevent by the measures such as white paint, wrapping grass, tending one time and reserving grass around tree trunk.