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Method for measuring porosity of shelter belt

A measurement method and technology of porosity, which is applied in the field of measurement of shelterbelt porosity, can solve problems such as difficult forest belt aerodynamic structure description items, inability to accurately guide shelterbelt production, operation and management, etc.

Inactive Publication Date: 2010-06-23
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, for a shelterbelt with an apparent width dimension, the two-dimensional porosity is the forest belt as a whole and does not really account for the structural components of the forest belt space, so it is difficult to use it as an ideal forest belt aerodynamic structure descriptive items, and cannot accurately guide the production, operation and management of shelterbelts

Method used

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  • Method for measuring porosity of shelter belt
  • Method for measuring porosity of shelter belt
  • Method for measuring porosity of shelter belt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: Measurement and calculation of dry volume

[0047] First, the measurement of the dry volume, the height dimension (the height dimension refers to the thickness of each layer of the forest belt) resolution is 1m in the height dimension, and the diameters at the upper and lower ends of the height from 200cm to 300cm are 12cm and 10cm respectively, then the trunk of this section should be A conic frustum can be calculated using the following formula: Get the volume of this section at a height of 250cm to be 9529.5cm 3 . Then the cumulative sum of all highly stratified dry volumes of the tree is the dry volume of the tree.

[0048] Second, establish the relationship function of dry volume, diameter at breast height, and tree height:

[0049] Table 1 The measured values ​​of dry volume, diameter at breast height and tree height are as follows:

[0050] tree number

DBH cm of D tree

H tree height cm

V volume m 3

1

13.50

...

Embodiment 2

[0061] Embodiment 2: Measurement and calculation of branch volume

[0062] First, the measurement of branch volume, first divide the branches into different groups according to the size of the branches, and then use the sampling method to measure the middle diameter, branch length and the diameter of the two ends of the branches in the sample. The length of the branch is 120cm. Since the thickness of the branch has a mutation in the length direction, two sections are separated at the mutation point. The diameter of the upper and lower ends of the first section is 20mm, 15mm, and the length is 80cm. Then the volume of this section is: The upper and lower diameters of another section are 8mm and 2mm, and the length is 40cm. The volume of this section is: The actual volume of the volume of the segment is the sum of the two ends V R =202.5cm 3 . Simultaneously, the median diameter of the branch (the diameter of the branch length midpoint) is 16 cm, so the volume obtained by u...

Embodiment 3

[0091] Embodiment 3: Measurement and calculation of leaf volume

[0092] First, the measurement method of leaf volume, if the total weight of one layer of leaves is 3000g, randomly sample 200g from it, and use the drainage method to measure the volume of the 200g sample to be 230mL, then the volume of this layer of leaves is 230*( 3000 / 200) = 3450mL, and so on. You can get the leaf layer volume and total volume of each tree.

[0093] The drainage method is to add a certain amount of water into a graduated container, then immerse a certain amount of leaves in the water, measure the change of the water level in the container, and calculate the volume of these leaves.

[0094] Second, establish the relationship function of leaf volume, diameter at breast height, and tree height:

[0095] The measured value of table 6 leaf volume, diameter at breast height and tree height is as follows:

[0096] tree number

DBH of D tree

H tree height cm

V lobe volume

...

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Abstract

The invention discloses a method for measuring the porosity of a shelter belt, comprising the following steps: firstly, measuring size of components of a forest belt, breast height of trees in the forest belt, tree height and profile of longitudinal section of the forest belt; secondly, establishing a function of the relationship among the size of the tree, the breast height and the tree height according to the relationship between the measured size of the tree and the breast height as well as the tree height; thirdly, determining distribution of the size of each tree in the vertical direction by means of a distribution regression function of the sizes of the trees in the forest belt along the vertical direction; fourthly, determining horizontal distribution of the size of the forest belt in each layer by means of the longitudinal section of the forest belt; and finally, building a spatial three-dimensional matrix distribution map of the size of the forest belt, wherein the determined gap in the forest belt is the porosity of the shelter belt. The method for measuring the porosity of the shelter belt provided by the invention is a measurement method for three-dimensional porosity of the shelter belt; and the method reflects the internal structure of the forest belt more truly.

Description

technical field [0001] The invention relates to a method for measuring the porosity of a shelterbelt, in particular to a method for measuring the three-dimensional porosity of a shelterbelt. Background technique [0002] Shelterbelts are the fundamental guarantee for the normal operation of agricultural production and operation and various traffic activities. According to the needs of different protection purposes (such as orchards, habitats, vegetable fields, farmland, roads, etc.), forest belts with different structures are designed to reduce the impact of natural disasters such as strong winds. harm. The design of forest belt structure mainly includes: the determination of parameters such as forest belt density, forest species collocation, number of forest belt rows, height under branches, forest belt height and section shape, and these parameters are comprehensively reflected in the forest belt porosity index, so the accurate determination The porosity is the main basis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/00A01G23/00
Inventor 范志平高俊刚邓东周余新晓孙学凯张新厚
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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