How to measure the diameter of a tree with a tree DBH ruler?

Measure the diameter of trees at 1.3m above the ground with standard measuring tools, such as a tree diameter measuring ruler.

Brief introduction of tree DBH ruler: You can measure the diameter, perimeter and specifications of trees, and the values read around the trunk are the perimeter and the diameter corresponding to the perimeter.

There are also different opinions about the height of DBH, such as 1.2m, 1.3m, etc. The following excerpts are for your appreciation.

Local standards of Hebei Province:

Male seedlings of Populus tomentosa

2.4

Trunk diameter measured at1.3m above the ground.

The diameter of the seedling trunk is from the soil mark on the seedling trunk ground up to1.3m.

4.2 detection

Measure with standard measuring tools.

4.2. 1 DBH

If the measured part is swollen or the trunk shape is not round, measure the normal starting position of the trunk of the upper seedling, and the reading is accurate to 0. 1cm.

Terrestrial carbon measurement method

http://www . win rock . org/ecologies/files/win rock _ Methods _ Manual _ SOPs _ 2005 _ Chinese _ edition . pdf

Correct use of DBH ruler is very important to ensure the continuity of measurement data;

All standing trees should be affixed with aluminum nails (aluminum only). Don't nail all the nails into the tree to ensure that the tree has room to grow. Nails should be driven into a certain depth to fix the label.

With a ruler or pole with a height of1.37m, the DBH position of the wood can be determined accurately. If you don't have the above tools, you can use a strong stick (at least 2 cm in diameter).

The field survey workers should first lean the measuring pole against the tree to indicate the position of DBH. The placement method of the measuring rod depends on the slope of the ground and the shape of the tree.

If the object tree branches at breast height, two branches need to be measured and recorded in the data table as two trees;

Winlock

-

way

guidebook

-

soak

-

2005

version

copyright

2005

Winlock

international

-

48

-

If the object tree has fallen, but it is still alive, put the measuring rod at the root of the tree to measure the DBH, just like when the tree grows upright. If there are still green leaves on the tree, it is considered as a living tree, even if there are only 1 or 2 leaves on the tree, it is considered as a living tree.

There is a hook at one end of the DBH ruler. Press the hook into the bark, and then pull the measuring rope to the right. DBH ruler

It is usually pulled from left to right, around the trunk, even if the tree surveyor is left-handed.

When the DBH ruler circles the tree and returns to the hooked end, it should be placed above the hook, as shown in the diagram below. The DBH ruler must not face outwards, and the side marked with numbers must face outwards.

If the object is inclined, it must surround the DBH ruler according to the natural inclination angle of the object, not the angle parallel to the ground.

Winlock

-

way

guidebook

-

soak

-

2005

version

copyright

2005

Winlock

international

-

Forty nine

-

Use DBH ruler correctly use DBH ruler correctly use DBH ruler correctly use DBH ruler correctly.

The DBH ruler must be pulled out to the right.

The DBH ruler must form a correct angle with the inclination of the tree.

Don't put the DBH ruler in an abnormal position on the suitcase.

Winlock

-

way

guidebook

-

soak

-

2005

version

copyright

2005

Winlock

international

-

50

-

The measurement position of DBH of irregular and regular irregular and regular irregular and normal tree; Measuring position of DBH of common trees; Measurement position of normal tree DBH.

Winlock

-

way

guidebook

-

soak

-

2005

version

copyright

2005

Winlock

international

-

5 1

-

If there are vines or vines on the tree to be measured in the nested fixed sample plot, do not prune the vines in order to clean up a place where the object tree is to be measured. If possible, push the vines away from the trunk and put the DBH ruler around the vines. If the vines are too big to push away from the trunk, pull them on the front of the tree with the back of DBH ruler. This method can be used to estimate the DBH of the target tree. Cutting off the vines on the tree to measure the tree can only be used as a last resort, because repeated measurement with this method will interfere with the natural dynamic succession of the sample plot and cause the difference between the sample plot and the surrounding forest. For other natural organisms (including fungi, epiphytes, fungal growth and termite nests, etc.). ) found in the object tree, also should follow this standard.