SU987370A1 - Tree ring width determination method - Google Patents

Description

The invention relates to technical IMI measurements, namely for determining the geometrical parameters of trees. .

The known method for determining the width of tree rings, which consists in basing a sample molded from a tree trunk in the radial direction with a hollow tool, relative to the measuring device, coordinates the tree rings of the sample along its generator and measuring the width of the rings.

The disadvantage of this method is the inaccuracy of determining the width of the annual rings of trees if the sample is taken with a deviation from the radial direction, since in this case the difference in coordinates of the boundaries of two adjacent annual rings will not be equal to the actual width of the annual rings.

The aim of the invention is to improve the accuracy of determining the width of the annual rings.

Delivered is achieved due to the fact that the coordinates of annual rings are measured along diametrically located generators lying in the section plane coinciding with the cross-sectional plane of the tree trunk.

Kah FIG. Figure 1 shows the plane of the tree trunk, the cross section (possible options for forming a sample with a hollow tool are indicated)} in FIG. 2 - secant plane of the sample taken, coinciding with the plane of the cross section of the tree trunk; in fig. 3 is a diagram of the arrangement of the annual rings on the sample., Taken with a deviation from the radial direction to the center of the trunk, used in the calculations to determine the width of the annual rings.

The method is carried out as follows.

From the trunk of the tree under investigation (Fig. 1), a sample is obtained using a hollow tool. In the ideal case, the sample 1 should be taken in such a way that its longitudinal axis passes through the center of the tree trunk, then the coordinate difference between the adjacent annual rings 2 will be equal to their width. However, in practice, samples 3 and 4 can be taken with the displacement of Shey B from the center of the river. In this case, the difference in coordinates of adjacent annual rings, measured along the longitudinal axis of the sample, will not be equal to the width of annual rings measured along the radius, since in this case the angle oL will not be taken into account. Therefore, after basing the obtained sample 3 relative to the measuring device of the sample, the coordinates of two adjacent annual rings are measured along diametrically located forming samples lying in the cross-sectional plane of the tree trunk. FIG. 3 shows the adjacent annual rings AB and SD in the form of concentrically located arcs. AC and HP are the segments of the generators along which measurements are made. The distance between the segments is equal to the diameter of the sample eZ. The readings of the coordinates of the annual rings are carried out at the points A, B, CD, their coordinates, respectively, will be A (0, 0); (a, i); C (a + b, 0); D (a + b + c, H).

The required quantity (width, annual ring j is defined as the difference of the radii of arcs of AD and DM. To do this, we find the coordinates of the center of arcs P

Wo / Woi

direct equation AB:: - x ,.

and

Jfcci cfe t. g a / ccj4cfe 040 y d t, -U 1 I L с-а 2 Г 2f, 2J

Claims (1)

fco + cb с + а V, .12 g d / co (+ cV c. a. c- "YY (1 s-a 2f. 2j) With a sufficient degree of approximation, the value of H can be determined by the simplified expression C ^ b) H This method allows increasing the accuracy of determining the width of the annual rings of the samples taken with a deviation from the center of the tree. Claims The method of determining the width of the annual rings of trees, consisting in that the sample is formed, shaped from a tree trunk radially equation pr my - b. x- V С The coordinates of the points And and N in the middle of the chords AB and CD M (a / 2 „V2); NU + b + c / 2.1i / 2h Equation of a straight line MP, perpendicular chord AN Equation is my NP, the perpendicular chord of the SD 2 " WITH . With “with. with . -P In  2 . Solving the system of equations (1) and (2), we determine the coordinates of the center of the arcs Р Uo. UE) s-a + oh s-yu1. m f with + a «Ь 0 -: ь VT: YY 2T AR radius length: .H-) CP radius length: (a4L | p + -. The required value H is the direction of the hollow instrument relative to the measuring device, measure the annual rings of the sample, and determine the width of the rings according to the coordinates obtained, in order to improve the accuracy of ring widths, annual rings coordinates are measured along diametrically located generators lying in a sectioning plane that coincides with the cross-sectional plane of a tree trunk. Sources of information taken into account during the examination 1. Vaganov E A., .. Terekhov I.A. Antshiz tree growth on the structure of growth rings. Novosibirsk, Science Siberian Branch, 1977, pp. 22-25 (prototype).