Generally DBH is not measured on dead trees or on those of less than 7 cm DBH. Diameter at Breast Height (DBH) is the most common parameter used in the measurement of standing timber. When measuring live trees most information is presented as over bark dimensions. Because trees are measured with the bark on, this is also called the Diameter at Breast Height Over Bark (DBHOB). By convention, the diameter of forest trees is measured in centimeters at 1.37 m above the ground and is termed the “Diameter at Breast Height” or DBH. In many countries, especially India, this will be at 1.37 m above the base of the tree where the tree meets the ground. In the past, girth has been used but this is no longer recommended.Ī carefully defined point should be used for measuring the diameter of the tree. In forestry, diameter should always be used for the description of the tree. It is not only necessary for calculation of volume of logs, but also necessary for making inventory of growing stock as well as to correlate height, volume, age, increment of trees.
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