What are the abbreviations of DBH, crown width, ground diameter, crown diameter, crown shape and crown diameter of seedlings?

Detailed symbols of seedling size: H is height, P or W is crown width, Ф is breast diameter, D is ground diameter, and T is head diameter.

DBH: Also called trunk diameter. It is short for height and diameter at breast height. One of the most basic factors in stumpage determination. The trunk off the ground is equivalent to the breast height diameter of an average adult. Due to the different heights of people, in order to make the measurement points consistent, the specific height of chest height is uniformly stipulated within a country, but it is not consistent in different countries. In China and most countries, the breast height is set at1.3m above the ground. When the section is deformed, measure the average of the maximum and minimum values. Common symbols: Ф or d

Ground diameter: refers to the diameter of soil trace. Universal symbol: d

Peng diameter: refers to the diameter of shrubs and shrubs' vertical projection surface.

Meter diameter: refers to the diameter at the ground 1 meter.

Crown width: in garden plots, it refers to the width of trees (seedlings) in the north-south or east-west direction, which is similar to the crown diameter and is usually used to indicate the specifications of trees and seedlings.

Common units: cm (centimeter) and meters (m) and millimeters (mm) can also be used. Meters are generally used for big trees, and millimeters are generally used for accurate garden design units. 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.