How to determine the specifications of clustered elms

1. The seedlings measured in DBH must be single-stemmed, and most of them are arbor species, including Huaqiao, Da Qiao and Er Qiao. For example, osmanthus fragrans, Lagerstroemia indica, Cinnamomum camphora, Pu Shu, Magnolia grandiflora, Jacaranda, Platanus acerifolia and so on are common. However, these varieties need to meet a requirement, that is, their branching point must be higher than 130cm before DBH can be determined. Most lists need DBH measurement when quoting or improving customers, and most of them refer to big trees.

Those saplings are suitable for measuring DBH position.

2. Several problems that should be paid attention to when measuring DBH of trees.

Every tree grows a little differently. The DBH position of most single-pole trees cultivated with fixed poles is larger than that measured by meter diameter. The result of one-time measurement of the same tree is DBH >: meter diameter > ground diameter, but there are a few varieties that are not. For example, Lagerstroemia indica has a DBH of 7 cm, which is larger than the DBH, and the upper part is smaller than the lower part, but the diameter exceeding 7 cm is reversed, and the DBH is a little larger than the measured diameter.

Several problems that should be paid attention to when measuring DBH of trees

Da Qiao varieties, such as Pistacia chinensis, Pu Shu, Acer truncatum and other trees with particularly high branches, are very suitable for DBH measurement. The DBH measurement price of these varieties is different from that of rice diameter measurement at the time of quotation, and the average specification result is above 1cm. Please be clear when quoting and digging trees.

Vernier caliper measurement is more accurate.

3, vernier caliper measurement is more accurate.

The DBH of a tree refers to the branch diameter at a certain position. Commonly used measuring tools are tape measure and vernier caliper, among which vernier caliper is more accurate. After all, not every trunk epidermis is smooth, round and flat, and there are more or less errors in measuring with a tape measure.

Tree species not suitable for DBH measurement

4. Tree species not suitable for DBH measurement.

bush

For example, shrub seedlings are not suitable for this method, mainly because their main stems are relatively small, mainly growing branches and leaves, and they are often foliage plants, so the tree condition is not suitable, so it is more suitable to calculate their size by height (H) and crown width (W).

bush

club

Not all seasonal flowers and plants are suitable for this method. Most of them belong to herbaceous flowers or perennial flowers, and most of them are calculated according to their nutrition cup size and crown height.

club

Short-branched unipolar tree

There are also trees with branching points below 120cm. These green seedlings belong to short branches, and the height of single stem does not reach the range of DBH measurement height. It is more appropriate to measure by meter diameter or ground diameter, mainly depending on the height of the branch point.

Short-branched unipolar tree

Ground cage clump tree

For example, common ground cage osmanthus trees, clustered Lagerstroemia indica trees, clustered Pistacia chinensis trees, clustered camphor trees and so on. The young trees of these species mainly appreciate their crown and natural growth, and the measurement methods of ground diameter, meter diameter and breast diameter are not suitable. The total height (h), crown width (w) and tree beauty can be combined to calculate their specifications.

Ground cage clump tree

Summary: The above are some key points and precautions about DBH measurement of trees. When measuring the specifications of green seedlings, they are still malignant and commonly used terms, such as height (H), crown width (W) and ground diameter (D).