How to divide large, medium and small trees when pricing greening projects?

In the process of engineering valuation, according to the quota list set, large, medium and small trees are distinguished according to the size of soil balls and DBH;

Small tree: the specification of soil ball is within 70cm, and the specification of DBH is within 10cm. Generally, no crane is needed for planting.

Medium arbor: the size of soil ball is between 70- 1 10cm, and the size of DBH is between 1 1cm-23cm. General planting requires 8T crane.

Large trees: the soil ball size exceeds 120cm, and the DBH size exceeds 23cm. At this time, a crane above 12T is needed for planting.