Ash’ari et al. (2012) has explained that in the beginning for easy measurement of the diameter or circumference of the rod adapted to overhung arms rather modestly ahead is done with the hope did not leave feeling tired during the measurement of the diameter or circumference of the stem takes place. But the facts on the ground prove that the measurement of the diameter or circumference of the trunk with overhung arms are at breast height does not give a clear position as measured trunk diameter or circumference.
Why? Position the tree trunk measured will vary if the person doing the measurements have different heights. Therefore, for the uniformity of measurement and provides measurement results with a high level of accuracy then finally taken a benchmark measuring the diameter or circumference at breast height rod carried dat is 1.30 m. Still in Asy’ari et al. (2012), in fact the agreement has included efforts to avoid if the layout measuring the diameter or circumference of the curve of the stem (neloid).
Spilasi used to avoid the trunk curvature of 0.20 m. So who is actually at breast height (1.30 m – 0.20 m) = 1.10 meters and then added spilasi 0.20 m. It would seem obvious to the terms of diameter or circumference measurement location which will be described below. Consider the condition of standing trees and ground conditions are not always relatively flat, so that the layout can cause measurement errors.
In order to obtain accurate data, the location of the measurement of the diameter or circumference should be adjusted. Below are given the exposure by measuring the diameter or circumference of the tree trunk standing.
(a) tree standing upright on flat ground
Location of measuring the diameter or circumference (LPD) as measured on a tree stand is the diameter or circumference of the tree trunk within 1.30 m above ground level. Therefore, the provisions of the diameter or circumference measurements as high as 1.30 m based on the tree standing upright on the soil surface is relatively flat, so that the measurement can be done as shown in Figure 9.
Figure 9. LPD tree standing upright on flat ground
(b) The tree stand tilted on flat ground
Location of measuring the diameter or circumference (LPD) is measured when the tree stand side on the ground is on the sloping trunk next to it. Thereby measuring the diameter or circumference of the tree trunk is done as shown in Figure 10, ie the extent of 1.30 m above ground level.
Figure 10. LPD sloping tree stand on flat ground
(c) The tree stands side on sloping ground
Location of measuring the diameter or circumference (LPD) is measured when the tree standing upright on the ground are quite steep (slope) is the diameter or circumference of the tree trunk within 1.30 m above ground level on one surface of the land where the tree grows. Why? Surface sloping ground will provide an opportunity to measure the diameter or circumference of the tree trunk in two ways as shown in Figure 11.
Figure 11. LPD tree stand side on sloping ground
(d) The tree whose root buttresses
Location of measuring the diameter or circumference (LPD) on a tree trunk that has buttressed height of the tip is based on tree buttresses stand.
- Limit end buttresses (Bub) of less than 1.10 m
Location of measuring the diameter or circumference (LPD) on a tree trunk that has buttressed less than 1.10 m is the height of 1.30 m above ground level. Measuring the diameter or circumference of the tree trunk as shown in Figure 12. - Limit end buttresses (Bub) the exact height of 1.10 m
Location of measuring the diameter or circumference (LPD) on a tree trunk that has buttressed the exact height of 1.10 m is the height of 1.10 m + 0.20 m or 1.30 m height above the ground. Measuring the diameter or circumference of the tree trunk as shown in Figure 13.
