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Forest stand cross-sectional area R-arrangement analog method

A technology of distribution simulation and basal area, which is applied in the field of R-distribution simulation of stand basal area, can solve the problems that the cumulative distribution of stand basal area cannot be simulated, and the variables of stand basal area are less considered.

Inactive Publication Date: 2008-08-20
INST OF FORESTRY CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0004] In the above prior art, less consideration is given to the stand basal area variable, and the cumulative distribution of the stand basal area cannot be simulated

Method used

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  • Forest stand cross-sectional area R-arrangement analog method
  • Forest stand cross-sectional area R-arrangement analog method
  • Forest stand cross-sectional area R-arrangement analog method

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Embodiment Construction

[0013] Stand basal area R-distribution simulation method of the present invention, its preferred embodiment is, carry out the simulation of stand basal area by following function: y=(1+exp(-(x-q) / p)) r ,

[0014] In the formula, x is the median value of the diameter order of trees in the stand; y is the percentage of the sum of tree sectional areas corresponding to the diameter order in the total sectional area of ​​trees in the stand; It can be obtained by nonlinear regression method.

[0015] The basal area of ​​a stand refers to the basal area at the DBH of a tree. The diameter step distance of the diameter step is 1 to 3 cm, such as 2 cm.

[0016] When the parameters q, p, and r are obtained by the regression method, at least 195 samples are obtained, and other numbers can be selected as required. Samples can be obtained by:

[0017] Select an area of ​​500-700m 2 , forest stand density is respectively 2 × 3m, 2 × 1.5m, 2 × 1m, 1 × 1.5m, 1 × 1m 5 plots form a block gr...

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Abstract

Disclosed is a method of R-distribution to model basal area of stand, modeling the stand basal area by the function y=(1+exp(-(x-q) / p))' wherein x is the median of stand diameter class; y is percentage of the sum of tree basal areas of the diameter class in the total sum of tree basal areas in the stand; q, p, r are parameters obtained by regression method. Application of the invention in Chinese fir plantation or other stands can precisely model cumulative distribution of basal area of stands.

Description

technical field [0001] The invention relates to a statistical technique of stand structure, in particular to a method for simulating R-distribution of stand sectional area. Background technique [0002] Stand basal area is one of the core factors among many arborimetry factors such as stand diameter, tree height, and tree crown. In the forest stand growth and harvest estimation system, the stand basal area is not only an important variable used to estimate the volume harvest, but also the main factor to be estimated. With the gradual deepening of understanding, the central role of the stand basal area growth model has become increasingly prominent. [0003] In the prior art, when people are studying stand growth, they always take stand diameter, tree height, branch height, crown width, tree distribution and accumulation as research objects, and discuss stand site, density, thinning, The growth effects of soil preparation, fertilization, provenance and clone selection are a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 张建国段爱国
Owner INST OF FORESTRY CHINESE ACAD OF FORESTRY