CN104112161A - Optimized calculation method for forest stand selective cutting amount based on electronic tree measurement gun - Google Patents

Abstract

The invention discloses an optimal calculation method for the selective felling amount of a forest stand based on an electronic tree measuring gun, which is characterized in that the electronic tree measuring gun is used to observe and count trees, obtain tree diameter, tree height, volume and other data, and through a specific algorithm Obtain the current stock volume and the stock volume after a period of time in the future, and carry out the increase of the stock volume after selective felling in a certain way. The optimal calculation method of the stand selective cutting amount based on the electronic tree measuring gun.

Description

A kind of optimized calculation method of the standing forest selective cutting amount based on electronics assize rifle

One, technical field

The present invention relates to a kind of optimized calculation method of standing forest selective cutting amount, particularly a kind of optimized calculation method of the standing forest selective cutting amount based on electronics assize rifle.

Two, technical background

In order to disclose Forest Growth succession of herbaceous and scientific management, to manage, utilize forest, be necessary large stretches of forests by the needs of the feature of itself and operation control, zoning becomes some each internal features identical, and there is the forest location of obvious difference with surrounding, occupy certain area, the synthesis simultaneously with forest, shrub and the ground quilt of some, this synthesis is called standing forest.Standing forest is the minimum region unit of zoning forest.Be grown in the forest of vast region, by complicated and diversified standing forest, formed, by origin, be divided into artificial forest and wildwood; By composition, be divided into pure forest and mixed forest; By the forest age, be divided into the forest of the same age and uneven aged forest; By the vertical closure of forest form, be divided into unlined forest and irregular forest etc.Generally can be summarized as individual layer pure forest of the same age and the mixed standing forest of handing over multiple layer uneven aged forest two large types.

The selective cutting of traditional standing forest mainly for individual layer pure forest of the same age, artificial forest etc., but along with the growths of trees, the strongly fragrant increase in density of forest, the growth phase of trees is to slowly.Selective cutting has not only improved the space structure of standing forest, has also met the demand in market simultaneously, has produced maximum economic benefit, makes forest realize Sustainable Operation.

Three, summary of the invention

In order to make the accumulation of forest more reasonable, realize the maximization of accumulation, can both can obtain timber by good time rational selective cutting, also can increase accumulation.Low precision when overcoming image data, efficiency is low, and the shortcoming that the cycle is long, realizes the accurate measurement of standing forest data, a kind of standing forest selective cutting optimized calculation method based on electronics assize rifle that this method adopts.It is characterized in that: by electronics assize rifle observation counting wood, obtain the data such as the trees diameter of a cross-section of a tree trunk 1.3 meters above the ground, the height of tree, the volume of timber, and obtain current accumulation and the accumulation after following a period of time by specific algorithm, and according to certain mode, cut the recruitment of rear accumulation selectively.

Main summary of the invention:

1. by electronics assize rifle, obtain and calculate the needed basic data of accumulation;

2. a kind of algorithm that calculates current accumulation and following accumulation;

3. the optimization of standing forest selective cutting amount.

This invention has the following advantages compared with the conventional method:

(1) realize the perfection of the low cost, microminiaturization, intellectuality of surveying instrument, integrated, real-time, high reliability integrated.Alleviate to a certain extent and measure operation intensity, expand the business scope of instrument of surveying and mapping.

(2) by electronics assize rifle, can when carrying out forest survey, obtain the accumulation in current accumulation and following certain hour, and obtain accumulation and the recruitment after selective cutting by specific algorithm.

Four, accompanying drawing explanation

Fig. 1-Fig. 2 is measuring principle figure of the present invention.

Fig. 1 is electronics assize rifle angle gauge plectrum and A/F explanation schematic diagram

Fig. 2 is diameter of a cross-section of a tree trunk 1.3 meters above the ground height of tree instrumentation plan

Five, embodiment:

Standing forest selective cutting amount optimized calculation method based on electronics assize rifle, from existing methodical different, is specifically:

(1) observation counting wood, utilizes electronics assize rifle, according to standing forest condition and investigation specifications, can select angle gauge coefficient Fg=0.5, and a kind of in 1,2,4 four kinds of grades, then according to the function of assize rifle, carries out height of tree H _j, diameter of a cross-section of a tree trunk 1.3 meters above the ground D _j, N is counted in strain _j, volume of timber V _j.Wherein in observation process, by button, select count value, and Auto-counting.By the strain of different sample plots, count Nj and obtain whole strain number: N _{1 (0)}+ N _{2 (0)}+ ... + N _{m (0)}=N.

(2) set up mathematical model, $\left\{\begin{array}{c}N=a_1{d}^{b_1}\·\·\·\·\·\·\left(a\right)\\ d_{t+1}=a_2{d}_t^{b_2}\·\·\·\·\·\·\left(b\right)\\ H_{t+1}=a_3{H}_t^{b_3}\·\·\·\·\·\·\left(c\right)\end{array}\right.,$ By data acquisition model coefficient.

(3) (c) can be in the hope of following each rank, footpath D according to formula (b) _t+1, H _t+1value, and estimate the distribution height of tree H on each rank, footpath _{j (1)}, diameter of a cross-section of a tree trunk 1.3 meters above the ground D _{j (1)}, N is counted in strain _{j (0)}, volume of timber V _{j (1)}.And (b) try to achieve new height of tree H according to formula (a) _j, diameter of a cross-section of a tree trunk 1.3 meters above the ground D _jand N is counted in corresponding new sample ground strain _j.So new whole distract strain number is: N _{1 (1)}+ N _{2 (1)}+ ... + N _{m (1)}=N ₀.So gross density reduction is Δ N=N-N ₀.

(4) so suppose present t ₀accumulation be: following a certain moment t ₁accumulation be: so the increment producing when without felling is: $\mathrm{\ΔV}=V_{\left(1\right)}-V_{\left(0\right)}=\frac{1}{8}\mathrm{\π}{f}_{\mathrm{\θ}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{N}_j(d_{j\left(0\right)}+d_{\left(j\left(1\right)\right)})\mathrm{\Δd\ΔH}.$ If following a certain moment t while adopting selective cutting ₁accumulation be: so the increment while adopting selective cutting is: $\mathrm{\Δ}{V}^{\′}=\frac{1}{8}\mathrm{\π}{f}_{\mathrm{\θ}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{N}_j^{\′}(d_{j\left(0\right)}^{\′}+d_{j\left(1\right)}^{\′})\mathrm{\Δ}{d}^{\′}\mathrm{\Δ}{H}^{\′}.$ Because N during selective cutting _jreduce, D increases, i.e. D ₀increase and then D ₁' increase.

(5), while meeting Δ V ' >=Δ V, while cutting selectively, can increase accumulation, and can obtain required timber.

Claims (1)

1. An optimal calculation method for stand selective felling based on an electronic tree measuring gun, characterized in that: the electronic tree measuring gun is used to observe and count trees, obtain data such as tree diameter at breast height, tree height, and volume, and obtain the data through a specific algorithm The current storage volume and the storage volume after a period of time in the future, and the increase in the storage volume after selective cutting in a certain way. Specific steps are as follows: (1) Observing and counting trees, using an electronic tree measuring gun, can select one of the four types of angle gauge coefficient Fg=0.5, 1, 2, 4, etc. according to stand conditions and survey specifications, and then according to the function of the tree measuring gun, Perform tree height H _j , diameter at breast height D _j , number of plants N _j , and volume V _j . in During the observation process, select the count value by pressing the key, and count automatically. The whole number of plants is obtained by the number of plants Nj in different sites: N ₁₍₀₎ +N ₂₍₀₎ +...+N _m(0) =N. (2) Establish a mathematical model, $\left\{\begin{array}{c}N=a_1{d}^{b_1}......\left(a\right)\\ d_{t+1}=a_2{d}_t^{b_2}......\left(b\right)\\ h_{t+1}=a_3{h}_t^{b_3}......\left(c\right)\end{array}\right.,$ Get the model coefficients from the data. (3) According to the formula (b)(c), the values of D _t+1 and H _t+1 of each diameter step in the future can be obtained, and the distribution tree height H _j(1) and DBH D _{j( 1)} , number of plants N _j(0) , volume V _j(1) . And get the new tree height H _j , diameter at breast height D _j and the corresponding new number of trees N _j in the sample plot according to the formula (a) (b). Therefore, the new number of plants in the whole area is: N ₁₍₁₎ +N ₂₍₁₎ +...+N _m(1) =N ₀ . So the total density reduction is ΔN=NN ₀ . (4) So assume that the accumulated amount of t ₀ is: The accumulation amount of _t1 at a certain time in the future is: So the amount of growth produced when there is no harvesting is: $\mathrm{\ΔV}=V_{\left(1\right)}-V_{\left(0\right)}=\frac{1}{8}\mathrm{\π}{f}_{\mathrm{\θ}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{N}_j(d_{j\left(0\right)}+d_{\left(j\left(1\right)\right)})\mathrm{\Δd\ΔH}.$ If selective cutting is adopted, the accumulation amount at a certain time _t1 in the future is: $V_{\left(1\right)}^{\′}=\frac{1}{4}\mathrm{\π}{f}_{\mathrm{\θ}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{N}_j^{\′}{d_{j\left(1\right)}}^2(h_{\left(1\right)}^{\′}+3),$ Therefore, the growth rate when using selective cutting is: $\mathrm{\Δ}{V}^{\′}=\frac{1}{8}\mathrm{\π}{f}_{\mathrm{\θ}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{N}_j^{\′}(d_{j\left(0\right)}^{\′}+d_{j\left(1\right)}^{\′})\mathrm{\Δ}{d}^{\′}\mathrm{\Δ}{h}^{\′}.$ Because N _j decreases during selective cutting, D increases, that is, D ₀ increases and D ₁ ' increases. (5) When ΔV'≥ΔV is satisfied, that is, the stock volume can be increased during selective felling, and the required wood can be obtained.