Relationship between crown width and DBH

1, crown diameter-also known as crown diameter, refers to the diameter between the maximum amplitude of seedling crown cluster, which is often expressed by "P".

2. Ground diameter-refers to the diameter of the trunk at a distance of 0.3m from the ground, which is often represented by "D".

3. DBH-refers to the diameter of the trunk at 1.2m above the ground, often expressed as "φ".

4. The diameter of the soil ball-also called the diameter of the soil ball-refers to the diameter of the soil ball carried by the root system when the seedlings are transplanted, which is often expressed by "D".

5. The conversion relationship between DBH and crown width of trees and shrubs is:

The diameter of soil ball of trees is calculated as 8 times of DBH, and when DBH is difficult to calculate, it is calculated as 7 times of ground diameter; Diameter of soil ball of shrub or sub-tree (such as cluster osmanthus, etc.). ) is calculated as 65438+ 0/3 of its crown diameter.

Extended data:

Crown width refers to the average width of trees (seedlings) in the north-south and east-west directions, which is similar to the crown diameter and is usually used to indicate the specifications of trees and seedlings. Most of them are used by foreign and Hong Kong design companies.

Common symbol: P (capital) is generally used for large shrubs or small trees, such as pomegranate with crown width 100 cm, abbreviated as pomegranate P 100.

P (lowercase) is generally used to make hedges or small shrubs with colored blocks, such as Pittosporum p35 with a crown width of 35 cm.

Crown width can also be expressed by w, and there is no unified symbol at present.

Objective: Crown width is a reference standard to measure the growth of seedlings. In landscape design, the crown width of seedlings is used to calculate the number of seedlings planted in each square.

Source: Baidu Encyclopedia: Crown Width