CN104794324A - Bucking method using 3D angle gauge for forest clear cutting by compartment - Google Patents

Abstract

The invention is a bucking method using a 3D angel gauge for forest clear cutting by compartment. The 3D angle gauge serves as a tool, an angle gauge point is selected in the compartment in a cutting area. Through measurement on counting tree species, diameters at breast heights and heights of trees, tree species and diameter-class distribution of the whole compartments are calculated, the outturn percentage of the compartment is acquired according to a diameter estimating model for any position of a standing tree, wood yields of a large-diameter class, a medium-diameter class and a small-diameter class are calculated, and the design of clear cutting can be measured and calculated easily and quickly. The used tool is simple, the operation is convenient, traditional scale measuring by trees is replaced, the workload is reduced, and efficiency of clear cutting design is improved.

Description

A kind of forest bottom class clear felling producing material method utilizing 3D angle gauge

One, technical field

The present invention relates to a kind of forest bottom class clear felling producing material method, particularly utilize the forest bottom class clear felling producing material method of 3D angle gauge.

Two, technical background

Producing forest is one of Main Economic benefit of forest, one of final felling mode, in predetermined area of woods, namely termly, repeatedly fell ripe forest and woodlot.Selective cutting can make forest constantly realize local updating, and ground remains forest-floor, and the forest thus formed is irregular forest in different age, and can give full play to the ecological benefits of forest, but equipment benefit better can not play, cost is higher.

What traditional clear felling effect adopted is every wooden dipping, namely carries out the work of the measurement diameter of a cross-section of a tree trunk 1.3 meters above the ground to forests all in cutting area, then utilizes local single entry volume table to carry out collection estimation.The method workload, the cycle is long, and especially in the comparatively complicated forest zone of landform, exploitativeness is poor.Along with the development of various assize instrument, there is a lot of new instrument, new equipment may be used in forest clear cutting system, but comparatively suitable in physical features flat country, be difficult to put to good use, still based on manual work at comparatively steep, that forest land condition is poor these equipments of place of landform.

So in tradition, forest clear cutting system is subject to the restriction of instrument and equipment, land occupation condition, operation technique method, and workload is large, and the cycle is long, is difficult to obtain promising result fast.And angle gauge is as the important technology method of forest survey and means, since it is invented, just received the favor of whole world forest workers, but so far, the technical method utilizing 3D angle gauge to carry out the clear felling of forest bottom class rarely has report.The present invention, by the clear felling producing material design of angle gauge forest bottom class, improves speed and the precision of forest structural variable mensuration, effectively improves this technology and method.

Three, summary of the invention

In order to improve the problems such as workload is large in traditional forest bottom class clear felling producing material, the object of this invention is to provide a kind of forest bottom class clear felling producing material method utilizing 3D angle gauge.

The object of the present invention is achieved like this:

1) be angle gauge point away from the point that selective advantage seeds in the standing forest of border are evenly distributed, can represent standing forest mean state in cutting area, with 3D angle gauge for instrument, select suitable angle gauge coefflcient, 3D angle gauge is used to carry out around survey, note counting wood number is, to every strain counting wood, record its seeds, the diameter of a cross-section of a tree trunk 1.3 meters above the ground, the height of tree;

2) seeds distribution, the distribution of rank, footpath is calculated by the wooden observed reading of counting;

3) empirical model is utilized calculate small diameter grade material (6≤d < 20cm), central diameter level material (20≤d < 26cm), the greatly material of footpath level material (6≤d) and correspondence are long, calculate Merchant Volume Ratio.

This invention has the following advantages:

The first Application of 1.3D angle gauge in forest bottom class clear felling producing material, has expanded the range of application of 3D angle gauge;

2. 3D angle gauge of the present invention carries out forest bottom class clear felling producing material, and method is simple, and easy to operate, the mensuration for forest structural variable has newly created a kind of method.

Four, embodiment

Utilize a forest bottom class clear felling producing material method for 3D angle gauge, difference is:

1) be angle gauge point away from the point that selective advantage seeds in the standing forest of border are evenly distributed, can represent standing forest mean state in cutting area, with 3D angle gauge for instrument, first select suitable angle gauge coefflcient, common angle gauge coefflcient has F _g=0.5,1,2,4,6, use 3D angle gauge to carry out around survey, note counting wood number be i (i=1,2 ..., n), wooden to every strain counting, record its seeds, diameter of a cross-section of a tree trunk 1.3 meters above the ground d _aj, height of tree h _aj;

2) formula is utilized calculate a (a=1,2 ..., m) seeds jth (j=1,2 ..., k) rank, footpath strain number, utilizes formula calculate a seeds per hectare strain number, utilize formula calculate this bottom class's standing forest per hectare strain number, wherein, F _gfor angle gauge coefflcient, g _ajthe average section being rank, a seeds jth footpath sample trees is long-pending, by formula try to achieve;

3) empirical model is utilized calculate small diameter grade material (6≤d < 20cm), central diameter level material (20≤d < 26cm), the greatly material of footpath level material (6≤d) and correspondence are long, utilize formula ask calculation Merchant Volume Ratio, wherein V is standing tree stem volume, V ₀for large, medium and small footpath level material summation.

Claims (1)

1. one kind utilizes the forest bottom class clear felling producing material method of 3D angle gauge, it is characterized in that: with 3D angle gauge instrument, an angle gauge point is chosen in the bottom class of cutting area, by the mensuration to counting wood species, the diameter of a cross-section of a tree trunk 1.3 meters above the ground, the height of tree, calculate the seeds of whole bottom class, the distribution of rank, footpath, try to achieve this bottom class's volume recovery according to standing tree any place diameter estimation models, and calculate the mill run of large footpath level, central diameter level, small diameter grade, concrete steps are as follows:

1) be angle gauge point away from the point that selective advantage seeds in the standing forest of border are evenly distributed, can represent standing forest mean state in cutting area, with 3D angle gauge for instrument, first select suitable angle gauge coefflcient, common angle gauge coefflcient has F _g=0.5,1,2,4,6, use 3D angle gauge to carry out around survey, note counting wood number be i (i=1,2 ..., n), wooden to every strain counting, record its seeds, diameter of a cross-section of a tree trunk 1.3 meters above the ground d _aj, height of tree h _aj;

2) formula is utilized calculate a (a=1,2 ..., m) seeds jth (j=1,2 ..., k) rank, footpath strain number, utilizes formula $N_a=F_g{\mathrm{\&Sigma;}}_{j=1}^k\frac{Z_{\mathrm{aj}}}{g_{\mathrm{aj}}}$ Calculate a seeds per hectare strain number, utilize formula $N=F_g{\mathrm{\&Sigma;}}_{a=1}^m{\mathrm{\&Sigma;}}_{j=1}^k\frac{Z_{\mathrm{aj}}}{g_{\mathrm{aj}}}$ Calculate this bottom class's standing forest per hectare strain number, wherein, F _gfor angle gauge coefflcient, g _ajthe average section being rank, a seeds jth footpath sample trees is long-pending, by formula try to achieve;

3) empirical model is utilized calculate small diameter grade material (6≤d < 20cm), central diameter level material (20≤d < 26cm), the greatly material of footpath level material (6≤d) and correspondence are long, utilize formula ask calculation Merchant Volume Ratio, wherein V is standing tree stem volume, V ₀for large, medium and small footpath level material summation.