What does DBH stand for?
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Diameter at Breast Height.
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What does DBH stand for?
Diameter at Breast Height.
What do the pink solid lines represent in the measurement guidelines?
The position of DBH measurement.
What is the focus of the Tree Register of the British Isles?
Tree conservation.
What tool is more suitable for measuring smaller trees?
A Caliper, as it gives a direct measurement of diameter.
What does the yellow arrow indicate in DBH measurement?
A height of 1.3 m for DBH measurement.
What does the International Society of Arboriculture (ISA) offer?
Publications on measuring diameter at breast height (DBH).
Why is DBH a common method for measuring trees?
It allows monitoring of tree growth and comparison of different tree dimensions.
What should be avoided when measuring the diameter of a tree fork below breast height?
The swollen part of the trunk.
What should you do to ensure accurate measurement with a tape?
Loosen and re-tighten the tape or slide it around the trunk.
What is the formula for calculating diameter (D) from circumference?
D = circumference / π.
What should be done if a tree splits into several stems close to the ground level?
Measure the DBH of each stem separately and report the number of stems and their diameters.
What do the yellow dotted lines indicate?
The ground level.
How can the DBH for a tree with multiple stems be consolidated into a single index?
Take the square root of the sum of all squared stem DBHs.
What is the consequence of measuring DBH at a horizontal level?
It is incorrect and may lead to inaccurate measurements.
How can you increase accuracy in DBH measurement?
By standing a 1.3 m long stick next to the tree to set the measurement level.
What tool is preferable for measuring DBH in large trees?
Diameter Tape.
Which organization provides a manual on plot establishment and monitoring in Canada?
Environment Canada Ecological Monitoring and Assessment Network (EMAN).
What type of information can be found on the Australian National University (ANU) website?
Information related to mensuration and DBH measurement.
How should DBH be measured for a leaning tree?
On the side that the tree leans towards.
How should you measure DBH for trees with an elliptical cross-section?
Take two Caliper measurements at right angles and average them.
How is the DBH measured for a vertically growing tree on a slope?
Measure the DBH of the trunk on the upper side of the slope.
How should the diameter of a tree fork be recorded?
Note the diameter of the main trunk below the fork and the height of both the diameter measurement and the fork.
Why might a Caliper be unsuitable for measuring large trees?
It may not have arms long enough for measurement.
Which US department is associated with the Forest Inventory and Analysis (FIA)?
US Department of Agriculture (USDA) Forest Service.
What does the Practice Note aim to address regarding DBH measurement?
It aims to provide simple rules and tips for measuring DBH in Hong Kong.
What is a Diameter Tape used for?
To measure DBH, providing circumference on one side and estimated diameter on the other.
What should be done if a tree has a buttress affecting DBH measurement?
Measure just above the buttress and record the height where the measurement is taken.
What should you do if a Diameter Tape is not available?
Use a normal measuring tape to measure the circumference and calculate the DBH.
What is the standard height for measuring DBH in metric countries like Australia and Canada?
1.3 meters above ground.
What is the purpose of the references listed in Nature Conservation Practice Note No. 02?
To provide sources for further information on tree measurement and forest health monitoring.
How should DBH measurements be taken in relation to the tree trunk?
Perpendicular to the axis of the tree trunk.
At what height is DBH measured in the United States?
4½ feet above ground.
What is a straightforward situation for measuring DBH?
When a tree has a clear straight or gradual tapering trunk.
What is the purpose of the Nature Conservation Practice Note No. 02?
To provide technical guidance for the measurement of Diameter at Breast Height (DBH).
What challenges may arise in measuring DBH?
Uncertainties in how DBH should be measured in certain situations.
How is a tree defined in Hong Kong regarding DBH?
A tree is defined as having a trunk diameter of 95 mm or more at a height of 1.3 m above ground.
