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Method for determining intermediate cutting intensity of natural secondary forest

A secondary and natural technology, applied in forestry, application, agriculture, etc., can solve the problem of lack of natural secondary forest density control technology, and achieve the effect of ensuring sustainable management effect, improving stand quality and simple method.

Inactive Publication Date: 2014-02-19
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on the stand density effect is mainly focused on artificial pure forests, and there is a lack of density control technology for natural secondary forests.

Method used

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  • Method for determining intermediate cutting intensity of natural secondary forest
  • Method for determining intermediate cutting intensity of natural secondary forest
  • Method for determining intermediate cutting intensity of natural secondary forest

Examples

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Embodiment 1

[0029] A method for determining the intensity of tending thinning in natural secondary forests, comprising the following steps:

[0030] 1) Construct competitive structural units

[0031] The competitive structural unit is defined as the target tree as the center, and one tree closest to the target tree is selected in each of the four quadrants as the competitive tree, and the target tree and four competing trees form a structural unit. The area of ​​the plane quadrilateral surrounded by the nearest four competing trees in the four quadrants of the object tree is called the area of ​​the competition structure unit, such as figure 1 As shown, A is the target tree, B, C, D, E are the nearest competing trees in each quadrant of the target tree, ∠1, ∠2, ∠3, ∠4 represent ∠BAC, ∠CAD, ∠DAE, ∠EAB. AB, AC, AD, and AE are the horizontal distances between the object tree and four competing trees, respectively. Because the competition structure unit constitutes a plane quadrilateral, a...

Embodiment 2

[0052] Step 4) in the inventive method also can be in statistics natural secondary forest stand density N 现实 , after obtaining the average canopy radius of the natural secondary forest, use this radius as R to directly calculate the minimum reserved density N of the forest stand where the standard site is located through formula (1) 最少 , then compare N 最少 with N 现实 to determine whether to replant or thinn trees.

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Abstract

The invention discloses a method for determining the intermediate cutting intensity of a natural secondary forest. The method for determining the intermediate cutting intensity of the natural secondary forest comprises the following steps of (1) building a competitive structure unit; (2) determining the minimum number of plants which are reserved; (3) building a function between a competitive structure unit area maximum value and a competitive structure unit average crown radius; (4) carrying out statistics on stand density N reality of the natural secondary forest, obtaining an average crown radius of the natural secondary forest, using the average crown radius as an R, calculating the minimum reservation density N minimum of the forest stand where a sample plot is located through the formula (1), if the N minimum is larger than the N reality, planting forest trees in the natural secondary forest in a supplement mode, wherein the N minimum minus the N reality is equal to the minimum number of the supplemented forest trees, and if the N minimum is smaller than the N reality, carrying out intermediate cutting, wherein the N reality minus the N minimum is equal to the maximum number of plants of intermediate cutting. The method for determining the intermediate cutting intensity of the natural secondary forest is simple, easy and convenient to operate, easy to master and free of cutting analytic trees, intermediate cutting can be rapidly achieved, and unwanted forest resource waste can be avoided.

Description

technical field [0001] The invention belongs to the technology of tending and thinning of natural secondary forests, and in particular relates to a method for determining the intensity of tending and thinning of natural secondary forests. Background technique [0002] Stand density control is one of the key technologies in forest ecosystem management. By timely and moderately adjusting the stand density, the tree trunk shape can be improved, and the tree diameter, tree height, volume growth and biomass accumulation can be promoted. At present, the stand density control technology of artificial pure forest is relatively mature. A large number of experimental studies have shown that density has a certain restrictive effect on stand growth, that is, the stand density effect. Researchers have successively constructed individual or group sizes such as average breast height diameter, average breast height sectional area, average single plant volume, and unit area accumulation. R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G23/00
Inventor 刘发林曾思齐肖化顺吕勇张江刘玉
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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