FORESTRY
FOREST PRODUCTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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data recorder
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log rule
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relaskop
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wedge prism
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Detailed explanation-1: -The wedge prism is primarily used in a similar manner as an angle gauge in variable-radius plot sampling. In this type of sampling, the wedge prism is used to estimate basal area of a group of trees by counting trees which are “in” or “out” of a plot centered on a single point.
Detailed explanation-2: -To estimate the Basal Area of a single tree, measure the tree’s diameter at breast height (dbh) and convert to BA with the following formula: BA = 0.00007854 x dbh2 dbh is in cm. The result will be in m2.
Detailed explanation-3: -With a prism you need to use the prism as the centre of the plot and rotate around it. Multiply the number of in trees by 2 to get the basal area for the stand in square meters per ha. (For example, if you count 20 trees, your basal area is 40 square metres per hectare).