Ratio of height and diameter, crown and root, of root cutting seedling were strong with more fibrous root, and higher rate of fungus root infection than untreated normal field seedlings.
Results: the success ratio of the reparation of two kinds of pile nuclear crown have not significant difference, but the miss ratio of the break of pile nuclear has obviously difference.
结果两种桩核冠修复成功率无显著性差异，失败率仅桩核折断有显著性差异。
3
The study showed that under the double CO2 concentration, sufficient nitrogen, and no other condition stress, the ratio between root and crown can not be affected by elevated CO2 concentration.