CN104792319A - Stand forest accurate target tree selective cutting selection technology - Google Patents

Abstract

The present invention discloses a stand forest accurate target tree selective cutting selection technology. A target tree is taken as a center, six trees nearest to the target tree are selected as subject trees, voronoi-thiessen polygon is taken as a picture composition basis, horizontal angle parameters are determined, competitive ratio is calculated, selective cutting rules are set up, the selective cutting target tree in the stand forest is scientifically and reasonably selected, the selective cutting target tree can be simply, fast, reasonably and quantitatively determined, operation is simple and convenient, and the selective cutting work target tree determine the efficiency can be effectively improved.

Description

A kind of standing forest precisely cuts the selection technique of goal tree selectively

One, technical field

The present invention relates to the selection technique that a kind of standing forest precisely cuts goal tree selectively, particularly utilize 7 standing forests set precisely to cut technology selectively.

Two, technical background

Forest forest output is one of main economic benefit, comes into one's own for many years always.Generally, adopt clear cutting system, but huge on the impact of surrounding environment generation after clear felling, cause series of environmental problems, be particularly not suitable for by the today of advocating energetically in forest conservation, so adopt selection method more.Forest reaches by selective cutting the working system being updated to object; facts have proved, selective cutting is one of important measures being conducive to forest resourceies sustainable use most, has both been conducive to meeting production, living to the demand of the forest reserves; be conducive to ecological protection again, also contribute to protecting diversity of organism simultaneously.

Traditional Forest Selective Cutting operation adopts two kinds of methods: diameter-limit and management selection cutting.Felled tree decides in strict accordance with the principle of " go to stay greatly little, rogue it is excellent to stay ".This principle method is simple, cannot quantitatively, section learns and selects selective cutting wooden.The object of this patent is to propose the selection technique that a kind of standing forest precisely cuts goal tree selectively, carries out science, proper selection method.

In traditional selection method, survey the restriction being subject to instrument and equipment, land occupation condition, operation technique method, 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, has just received the favor of whole world forest workers, but so far, selection technique that standing forest precisely cuts goal tree selectively rarely has report to utilize 3D angle gauge to carry out.The present invention passes through with angle gauge the selection technique of the optimal selective cutting wood being instrument, improves in selection method the speed of cutting another name for standard selectively and selecting, for selection method provides scientific basis and method.

Three, summary of the invention

In order to improve the thick mad property that in traditional selection method, selective cutting wood is selected, the object of this invention is to provide the selection technique that a kind of standing forest precisely cuts goal tree selectively.

The object of the present invention is achieved like this:

1) away from the standing forest of border, choose goal tree, 6 trees nearest around select target tree, as object tree, measure the horizontal sextant angle between adjacent two strain object wood;

2) the horizontal angle parameter of every strain object tree is calculated;

3) centered by goal tree, each object tree and its line length of side make its vertical line excessively, form hexagon ABCDE;

4) the competition ratio of goal tree (No. o) is determined by the area of competitive space hexagon ABCDEF and the area ratio of object wood hexagon 123456,

5) principle is felled in setting.

This invention has the following advantages:

The first Application of 1.3D angle gauge in Forest Selective Cutting operation, has expanded the range of application of 3D angle gauge;

2. the present invention cuts the accurate selection technique of another name for selectively, and method is simple, easy to operate, selects newly to have created a kind of method for cutting wood selectively.

Four, accompanying drawing explanation

Below in conjunction with accompanying drawing and example, the present invention is further described.

Fig. 1 to Fig. 4 is measuring principle figure of the present invention.

Five, embodiment:

Standing forest precisely cuts selection technique and the classic method of goal tree selectively, and difference is:

1) away from the standing forest of border, choose goal tree, be designated as No. o tree, nearest around 6 trees of select target tree as object tree, be designated as respectively i (i=1,2 ..., 6), measure the horizontal sextant angle between adjacent two strain object wood ${\mathrm{\β}}_{i(i+1)}=\left\{\begin{array}{cc}{\mathrm{\β}}_{i(i+1)};& i\≤5\\ {\mathrm{\β}}_{16};& i=6\end{array}\right.,;$

2) according to mathematical model calculate the horizontal angle parameter alpha of every strain object tree _i;

3) centered by goal tree (No. o), each object tree and its line, form length of side oi, crosses length of side oi and make its vertical line, and intersection point position is according to No. o tree diameter of a cross-section of a tree trunk 1.3 meters above the ground d at length of side two ends ₀with No. i number diameter of a cross-section of a tree trunk 1.3 meters above the ground d _iratio determine.Form hexagon ABCDE, be respectively A with the perpendicular intersection of length of side oi _i(i=1,2 ..., 6), A _iby formula determine its position: wherein, for goal tree (No. O) is to A _ithe distance of point; for object tree (No. i) is to A _ithe distance of point; g _ofor goal tree (No. o) basal area; g _ifor object tree (No. i) basal area; d _ofor goal tree (No. o) diameter; d _ifor object tree (No. i) diameter;

4) determined the competition ratio of goal tree (No. o) by the area of competitive space hexagon ABCDEF and the area ratio of object wood hexagon 123456, computing formula is: wherein K _ofor the competition ratio of goal tree (No. O); A _aBCDEFfor the area of competitive space hexagon ABCDEF; A ₁₂₃₄₅₆for the area of object wood hexagon 123456;

5) fell according to following principle:

(1) as β > 40 °, consider selective cutting goal tree, when β≤40 °, do not cut goal tree selectively;

(2) K is compared in the competition calculating every strain sample trees j in standing forest _j, then sort, the form feature of combining target tree, chooses K _jthe cutting n of rank, large footpath wood determined in the goal tree of > k _greatly;

(3) in residue standing forest, reselect goal tree, calculate the competition ratio of every strain goal tree, then sort, choose K _jthe cutting n of the goal tree determination central diameter rank wood of > k _in;

(4) in residue standing forest, reselect goal tree, calculate the competition ratio of every strain goal tree, then sort, choose K _jthe cutting n of the goal tree determination path rank wood of > k _little.

Claims (1)

1. standing forest precisely cuts a selection technique for goal tree selectively, it is characterized in that: select target sets 6 nearest trees for object wood, arranges horizontal angle parameter, calculates competition ratio, arrange selective cutting rule, scientific and reasonable selective cutting standing forest internal object tree, and concrete steps are as follows:

1) away from the standing forest of border, choose goal tree, be designated as No. o tree, nearest around 6 trees of select target tree as object tree, be designated as respectively i (i=1,2 ..., 6), measure the horizontal sextant angle between adjacent two strain object wood ${\mathrm{\β}}_{i(i+1)}=\left\{\begin{array}{cc}{\mathrm{\β}}_{i(i+1)};& i\≤5\\ {\mathrm{\β}}_{16};& i=6\end{array}\right.,;$

2) according to mathematical model calculate the horizontal angle parameter alpha of every strain object tree _i;

3) centered by goal tree (No. o), each object tree and its line, form length of side oi, crosses length of side oi and make its vertical line, and intersection point position is according to No. o tree diameter of a cross-section of a tree trunk 1.3 meters above the ground d at length of side two ends ₀with No. i number diameter of a cross-section of a tree trunk 1.3 meters above the ground d _iratio determine.Form hexagon ABCDE, be respectively A with the perpendicular intersection of length of side oi _i(i=1,2 ..., 6), A _iby formula determine its position: wherein, for goal tree (No. O) is to A _ithe distance of point; for object tree (No. i) is to A _ithe distance of point; g _ofor goal tree (No. o) basal area; g _ifor object tree (No. i) basal area; d _ofor goal tree (No. o) diameter; d _ifor object tree (No. i) diameter;

4) determined the competition ratio of goal tree (No. o) by the area of competitive space hexagon ABCDEF and the area ratio of object wood hexagon 123456, computing formula is: wherein K _ofor the competition ratio of goal tree (No. O); A _aBCDEFfor the area of competitive space hexagon ABCDEF; A ₁₂₃₄₅₆for the area of object wood hexagon 123456;

5) fell according to following principle:

(1) as β > 40 °, consider selective cutting goal tree, when β≤40 °, do not cut goal tree selectively;

(2) K is compared in the competition calculating every strain sample trees j in standing forest _j, then sort, the form feature of combining target tree, chooses K _jthe cutting n of rank, large footpath wood determined in the goal tree of > k _greatly;

(3) in residue standing forest, reselect goal tree, calculate the competition ratio of every strain goal tree, then sort, choose K _jthe cutting n of the goal tree determination central diameter rank wood of > k _in;

(4) in residue standing forest, reselect goal tree, calculate the competition ratio of every strain goal tree, then sort, choose K _jthe cutting n of the goal tree determination path rank wood of > k _little.