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Tree girth measurement diagram. Tree girth is a measurement of the circumference of tree trunk. It is one of the most ancient, quickest, and simplest of foresters' measures of size and records of growth of living and standing trees. The methods and equipment have been standardized differently in different countries.
Tree height is the vertical distance between the base of the tree and the highest sprig at the top of the tree. The base of the tree is measured for both height and girth as being the elevation at which the pith of the tree intersects the ground surface beneath, or "where the acorn sprouted."
Girdling prevents the tree from sending nutrients from its foliage to its roots, resulting in the death of the tree over time, and it can also prevent flow of nutrients in the other direction depending on how much of the xylem is removed. A branch completely girdled will fail; and, when the main trunk of a tree is girdled, the entire tree will ...
Using the rangefinder and clinometer, only four numbers are needed to complete the tree height calculation, and no tape is necessary, nor is direct contact with the tree. [2] [4] [5] The readings are 1) the distance to the top of the tree measured using the laser rangefinder, 2) the angle to the top of the tree measured with the clinometer, 3 ...
Group selection is designed to mimic larger, multi-tree mortality events, which in some environments may represent natural disturbance regimes. The maximum size of a group (before it becomes a patch, or clearcut) is debatable. Some say it may be up to 2 acres (0.8 hectares) in size, whereas others limit it to a maximum of 0.5 acres (0.1 hectares).
The undercut or notch cut is the guiding or aiming slot for the tree and is a V-shaped notch placed on the side of the tree in the direction of intended fall. [4]The back cut or felling cut is made on the opposite side of the tree of the undercut and is cut through the base of the tree severing the “hinge” holding the tree up.
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Maintaining proper posture while felling is also important, i.e., kneeling or squatting instead of stooping or bending over with straight legs. [2] [3] The use of improper felling techniques is dangerous, but may also reduce productivity and log supply, leading to increases in production costs in forestry and logging felling applications. [4]