CN105387840B - A kind of methods determining 10 tree left and right deduction outturn of stand of angle θ controlled sampling observation - Google Patents

Abstract

A kind of methods determining 10 tree left and right deduction outturn of stand of angle θ controlled sampling observation, is characterized in that：With MINI super-station instrument as instrument, in cutting area away from the standing forest of border in select the point that can represent standing forest mean state to be observation station, control the counting wood choosing the tree of 10 about as sampling observation, wooden diameter of a cross-section of a tree trunk 1.3 meters above the ground d of first measurement count to determine angle θ_iAnd thus calculate density N of standing forest, then measure every height H counting wood_i, from standing tree root, the top diameter d of every section of knaur is then measured successively upwards by the long L of material_ij；According to top diameter d_ijDifference knaur is divided into 3 groups of Different diameters, finally calculate the volume recovery of standing forest and waste wood rate.

Description

A kind of methods determining 10 tree left and right deduction outturn of stand of angle θ controlled sampling observation

First, technical field

This inventive method infers the volume recovery of overall standing forest with the thinking of sampling statisticses.

2nd, technical background

Traditional method needs when determining volume recovery to consider the difference of seeds, i.e. Merchant Volume Ratio.Merchant Volume Ratio is Refer to the ratio that timber assortment outturn accounts for the total volume of timber of corresponding belt leather.In forest survey work, typically only need to determine that economic material goes out material Rate grade (abbreviation out put class).Out put class often determines according to the percent levels that the economic material volume of timber accounts for Stand Volume.But in order to Simplify and measure work it is also possible to be determined with the percent levels of material tree strain number and standing forest total strain number according in standing forest.Research assortment Volume recovery can determine that assortment goes out material structure law, correctly comprehensively evaluates the resource quantity of forest and quality, rationally accurate warp Battalion forest provides important evidence.But traditional method determining material rate, it needs to be determined that assortment, can produce in practical operation Many inconvenience, it is proposed that a kind of method that just can calculate outturn of stand regardless of assortment is necessary.

3rd, content of the invention

This invention is a kind of methods determining 10 tree left and right deduction outturn of stand of angle θ controlled sampling observation, in cutting area Away from selecting the point that can represent standing forest mean state to be observation station in the standing forest of border, control selection 10 about to determine angle θ Tree, as the counting wood of sampling observation, is denoted as i (i=1,2 ..., r_；General r≤10), and diameter of a cross-section of a tree trunk 1.3 meters above the ground d of measurement count wood_i(require d_i＞ 5cm, otherwise cannot function as counting wood)；Make k=(50 θ)², then selected count wood density beThus count Calculate the density (unit of standing forest：Strain/hectare) be：Dispose MINI super-station instrument in observation station, first measure every meter The height H of number wood_i, then the top diameter d measuring every section of knaur from standing tree root by the long L of material successively upwards_ij(j=1,2 ..., m)；According to top diameter d_ijDifference, knaur is divided into big footpath rank material (d_ij>=26cm), central diameter rank material (20≤d_ij＜ 26cm), Path rank material (6≤d_ij＜ 20cm), and count each footpath rank material number；Work as d_ijDuring≤5cm, knaur disregards material, this timber and above tree Do and all process by waste wood, be calculated the height h away from treetop for this knaur_is；According to data above, calculate total mill run of standing forest：Waste wood amount：Then the volume recovery of standing forest is： Waste wood rate is：W=1-Q.

The method have the advantages that：Without the concern for the difference of seeds, only standing forest just can be calculated with single sample trees Volume recovery.

4th, brief description：

Fig. 1 counts the schematic diagram of wood for the observation of MINI super-station instrument.

5th, specific embodiment：

1st, in cutting area away from the standing forest of border in select can represent standing forest mean state point be observation station, to determine angle θ Control the counting wood that the tree choosing 10 about is observed as sampling；

2nd, calculate selected density n counting wood_i, thus calculate density N of standing forest；

3rd, dispose MINI super-station instrument in observation station, first measure every height H counting wood_i, then by material from standing tree root Long L measures the top diameter d of every section of knaur successively upwards_ij；

4th, according to top diameter d_ijDifference, knaur is divided into big footpath rank material (d_ij>=26cm), central diameter rank material (20≤d_ij ＜ 26cm), path rank material (6≤d_ij＜ 20cm), and count each footpath rank material number；

5th, calculate total mill run and the waste wood amount of standing forest, and calculate volume recovery and the waste wood rate of standing forest.

Claims (1)

1. a kind of methods determining 10 tree deduction outturn of stand of angle θ controlled sampling observation, is characterized in that：With MINI super-station instrument it is Instrument, chooses an observation station, the counting wood that 10 trees of selection are observed as sampling, by strain wooden to counting in the bottom class of cutting area Number, the mensure of the diameter of a cross-section of a tree trunk 1.3 meters above the ground, the height of tree and any place diameter, calculate volume recovery and the waste wood rate of whole standing forest, comprise the following steps that：

1) in cutting area away from the standing forest of border in select can represent standing forest mean state point be observation station, with determine angle θ control Choose 10 trees as the counting wood of sampling observation, be denoted as i, and value is 1,2 ..., 10；And diameter of a cross-section of a tree trunk 1.3 meters above the ground d of measurement count wood_i, Require d_i＞ 5cm, otherwise cannot function as counting wood；Make k=(50 θ)², then selected count wood density be：

$n_i=\frac{4k*{10}^4}{{\mathrm{\πd}}_i^2}$

Thus calculating the density of crop in units of strain/hectare is：

$N={\mathrm{\Σ}}_{i=1}^r{n}_i$

2) dispose MINI super-station instrument in observation station, first measure every height H counting wood_i, then by the long L's of material from standing tree root Integral multiple, that is, L, 2L, 3L ..., sL, measure the top diameter d of every section of knaur successively upwards_ij, j takes 1,2 ..., s；According to microcephaly Diameter d_ijDifference, knaur is divided into big footpath rank material d_ij>=26cm, central diameter rank material 20≤d_ij＜ 26cm, path rank material 6≤d_ij＜ 20cm, and count each footpath rank material number；Work as d_ijDuring≤5cm, note top diameter is d_is, knaur disregards material, this timber and above trunk All process by waste wood, be calculated the height h away from treetop for this knaur_is；

3) according to data above, obtain total mill run V of standing forest_AlwaysComputing formula be：

In formula, a, b are the coefficient of volume equation；

Waste wood part is approximately cone, obtains standing forest waste wood amount V_UselessComputing formula be：

According to mill run and waste wood amount, the computing formula obtaining volume recovery Q of standing forest is：

Then the computing formula of standing forest waste wood rate W is：

W=1-Q.