杨树立木材种材积成数与胸高直径呈极紧密相关。
There is very close correlation between the stumpage volume percent of poplar timber assortment and the stumpages D.
通过对梁山慈无性系种群秆形结构的研究，初步掌握了梁山慈相对直径和相对高度的关系、胸径与胸高壁厚的关系、梁山慈相对节间长度和节位数的关系。
We can find the relationships between relative diameter and relative height, DBH and breast height culm thickness, relative culm length and number of culm by studied the structure of culm form.
通过对梁山慈无性系种群秆形结构的研究，初步掌握了梁山慈相对直径和相对高度的关系、胸径与胸高壁厚的关系、梁山慈相对节间长度和节位数的关系。
We can find the relationships between relative diameter and relative height, DBH and breast height culm thickness, relative culm length and number of culm by studied the structure of culm form.
应用推荐