CN104615886A - Technological method for measuring forest stand volume variation distribution - Google Patents

Abstract

The invention discloses a technological method for measuring forest stand volume variation distribution. The technological method comprises the steps that according to forest stand conditions, an appropriate section area coefficient Fg is selected, forest stand is selected, mechanical point distribution is conducted, each distributed point is located through GPS, forest tree observation is conducted according to the Fg of each point, and the number Ni of trees within per hectare is recorded; wherein i ranges from 1 to n; the forest stand volume V is worked out, the covariance of the points is determined according to the intervals as d, 2d, ... , rd, ... , nd, and then a variation distribution function of the forest stand volume is obtained; the most appropriate distribution interval existing when the variance meets requirements during measurement of the forest stand volume is worked out, and the optical scheme of measurement of the forest stand volume is determined finally.

Description

The stand of a kind of mensuration becomes allochoric technical method

One, technical field

The present invention relates to a kind of method measuring the stand regularity of distribution, particularly the stand of a kind of mensuration becomes allochoric technical method.

Two, technical background

Up to the present, the method measuring Stand Volume mainly adopts every wooden dipping method and sample ground standardization, but in practical measurement process, traditional assay method also exists obvious shortcoming and defect:

1. adopt every wooden dipping method to carry out stand mensuration, be only suitable for accurate measurement among a small circle, the workload needed for large-scale Stand investigation is too large, and efficiency is very low;

2. adopt traditional sample ground standardization to measure stand, the set up an office distance of position of cloth seems particularly important, and when close together, the workload of mensuration is comparatively large, and when distant, precision and the accuracy reliability of mensuration are not strong;

So in stand mensuration process, every wooden dipping method and traditional sample ground standardization is adopted to carry out observing and all there is obvious shortcoming and error.

Three, summary of the invention

In order to overcome the trouble and error that exist in stand practical measurement, the present invention proposes the stand of a kind of mensuration and becoming allochoric technical method.

The object of the present invention is achieved like this:

1. select suitable basal area factor Fg according to standing forest condition, corresponding standing forest is selected according to rule, carry out machinery to layout, and locate each cloth with GPS and set up an office, require to lay point interval d=30 ~ 50m (d is integer), laying is counted and is more than or equal to 36, and as far as possible more than 200 points.

2., on each cloth sets up an office, carry out forest observation by often some Fg, record per hectare stem-number Ni (i=1,2,3 ..., n), utilize mathematical model 1. try to achieve Stand Volume V, then measure stand statistical variation or dispersion deviation according to different interval d respectively, finally just can obtain the variation distribution function relation of stand, thus determine that best stand measures scheme.

This invention has the following advantages with existing stand assay method ratio:

1. adopt sample ground standardization observation Stand Volume, can observe on reasonable Arrangement observation sample ground, decrease a large amount of artificial workloads, improve work efficiency;

2. the present invention for different standing forest conditions, according to stand variation distribution function, can determine that the accumulation of suitable standing forest the best measures scheme.

Four, accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 be standing forest sample accumulate the schematic diagram of layouting of mensuration;

Fig. 2 is the final function relation figure of stand variation distribution measured.

Five, embodiment

Determine that stand becomes allochoric process compared with assay method before, done larger improvement, specific implementation process is:

1) standing forest is selected, according to the basal area factor Fg that the selecting factors such as standing forest average diameter size, density, sighting condition and forest distribution situation are suitable, wherein, the Fg of we Chang Xuan has 0.5,1.0,2.0 and 4.0 4 kind, represents young growth, middle-aged forest, mature forest and overmature forest respectively.

2) according to the clearly corresponding standing forest condition of certain rule, carry out machinery and layout, and locate each cloth with GPS and set up an office, require to lay point interval d=30 ~ 50m (d is integer), laying counts is more than or equal to 36, and as far as possible more than 200 points.

3) on each cloth sets up an office, forest observation is carried out by often some Fg, record per hectare stem-number N _i(i=1,2,3 ..., n), and measure N _iit is the key that back calculates.

4) utilize mathematical model 1. wherein, V is Stand Volume, and f is the shape high level on corresponding counts wood rank, footpath, and Fg is basal area factor, N _i(i=1,2,3 ..., n) be per hectare stem-number, for standing forest forest mean height, try to achieve Stand Volume V.

5) utilize mathematical model 2. (i=1,2,3 ..., n), wherein, for the average strain number of standing forest per hectare forest, N _ifor per hectare stem-number, n is the hectare number of observation, tries to achieve the average strain number of standing forest counting wood

6) utilize mathematical model 3. wherein, σ ₀for standing forest counts wooden statistical standard deviation, finally try to achieve the covariance C of standing forest counting wood; Then, by being spaced apart d, 2d ..., rd ..., 4. nd, utilize mathematical model $\left\{\begin{array}{c}{\mathrm{\σ}}_d=\sqrt{\frac{{\mathrm{\Σ}}_{i=1}^{m_1}{(N_{i+1}-N_i)}^2}{2m_1}}\\ .\\ .\\ .\\ {\mathrm{\σ}}_{\mathrm{rd}}=\sqrt{\frac{{\mathrm{\Σ}}_{i=1}^{m_r}{(N_{i+r}-N_i)}^2}{2m_r}}\end{array}\right.,$ Calculate standing forest respectively and count wooden statistical standard deviation.

7) according to the counting wood standard deviation of the different interval of trying to achieve, utilize mathematical model 5. wherein, C is the covariance of statistical value, C ₀for the maximum variance of statistical value, k is the parameter reflecting inner degree of variation, and d is that cloth sets up an office interval, just can try to achieve the variation distribution of Stand Volume, finally determine the preferred plan that stand measures.

Claims (3)

1. mensuration stand becomes allochoric technical method, it is characterized in that: select suitable basal area factor Fg according to standing forest condition, carry out machinery to layout, and locate each cloth with GPS and set up an office, then observe and record by often some basal area factor, ask and calculate Stand Volume V, and determine the variance size of different interval point position, and then draw the variation distribution function of stand.

2. measure stand according to claim 1 one kind and become allochoric technical method, it is characterized in that: first, according to the basal area factor Fg that the selecting factors such as standing forest average diameter size, density, sighting condition and forest distribution situation are suitable, wherein, the Fg of we Chang Xuan has 0.5,1.0,2.0 and 4.0 4 kind, represents young growth, middle-aged forest, mature forest and overmature forest respectively; Secondly, select corresponding standing forest according to rule, carry out machinery and layout, and locate each cloth with GPS and set up an office, require to lay point interval d=30 ~ 50m (d is integer), laying counts is more than or equal to 36, and as far as possible more than 200 points; Then, on each cloth sets up an office, carry out forest observation by often some Fg, record per hectare stem-number Ni (i=1,2,3 ..., n); Finally, utilize mathematical model 1. wherein, V is Stand Volume, and f is the shape high level on corresponding counts wood rank, footpath, and Fg is basal area factor, N _i(i=1,2,3 ..., n) be per hectare stem-number, for standing forest forest mean height, try to achieve Stand Volume V.

3. measure stand according to claim 1 one kind and become allochoric technical method, it is characterized in that: first, utilize mathematical model 2. (i=1,2,3 ..., n), wherein, for the average strain number of standing forest per hectare forest, N _ifor per hectare stem-number, n is the hectare number of observation, tries to achieve the average strain number of standing forest counting wood secondly, utilize mathematical model 3. wherein, σ _ofor standing forest counts wooden statistical standard deviation, finally try to achieve the covariance C of standing forest counting wood; Then, by being spaced apart d, 2d ..., rd ..., 4. nd, utilize mathematical model $\left\{\begin{array}{c}{\mathrm{\σ}}_d=\sqrt{\frac{{\mathrm{\Σ}}_{i=1}^{m_1}{(N_{i+1}-N_i)}^2}{2m_1}}\\ .\\ .\\ .\\ {\mathrm{\σ}}_{\mathrm{rd}}=\sqrt{\frac{{\mathrm{\Σ}}_{i=1}^{m_r}{(N_{i+r}-N_i)}^2}{2m_r}}\end{array}\right.,$ Calculate standing forest respectively and count wooden statistical standard deviation; Finally, according to the counting wood standard deviation of the different interval of trying to achieve, utilize mathematical model 5. wherein, C is the covariance of statistical value, C ₀for the maximum variance of statistical value, k is the parameter reflecting inner degree of variation, and d is that cloth sets up an office interval, just can try to achieve the variation distribution of Stand Volume, finally determine the preferred plan that stand measures.