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How to measure leaf area index

A leaf area index and measurement method technology, applied in the field of ecological research, can solve problems such as difficult recovery, low efficiency, and low accuracy of leaf area index

Inactive Publication Date: 2011-12-07
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to solve the problems that LAI-2000 has a low accuracy rate in measuring leaf area index, and the harvesting method for measuring leaf area index has large labor intensity, low efficiency, damages the environment, and is difficult to recover; and provides a method for measuring leaf area index

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specific Embodiment approach 1

[0006] Specific embodiment one: the mensuration method of leaf area index in the present embodiment is realized through the following steps: one, the LAI-2000 plant canopy analyzer is placed on > 3.5 m away from the edge, at 10:00~14:00 , The light intensity is 8000~10000Lux, the wind speed is <7 grade and the air humidity is 10%~90%; 2. The data measured in step 1 are processed by the software of the LAI-2000 plant canopy analyzer and output, that is, the obtained Effective leaf area index; 3. Put the effective leaf area index into the following formula to calculate the leaf area index (LAI): Broad-leaved forest leaf area index (LAI) = 1.5457×effective leaf area index-0.0414; that is, the leaf area is completed Index determination.

[0007] The method described in this embodiment improves measurement efficiency, reduces labor intensity, and increases accuracy.

specific Embodiment approach 2

[0008] Embodiment 2: This embodiment differs from Embodiment 1 in that: the measurement time is 11:00~13:00. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0009] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the light intensity is 8500~9500 Lux. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The method for determining the leaf area index belongs to the field of ecological research. The invention solves the problems in the prior art that the accuracy rate of the LAI-2000 for measuring the leaf area index is low, and the labor intensity and efficiency of the harvest method for measuring the leaf area index are high. The method of the present invention is as follows: 1. Place the LAI-2000 plant canopy analyzer at a distance >3.5m from the edge, at 10:00~14:00, light intensity 8000~10000Lux, wind speed<7, air humidity 10%~90 %; 2. Obtain the effective leaf area index; 3. Bring the effective leaf area index into broad-leaved forest leaf area index = 1.5457 × effective leaf area index - 0.0414 or coniferous forest leaf area index = 0.9651 × effective Leaf area index + 0.4115; that is, the determination of leaf area index has been completed. The method improves measurement efficiency, reduces labor intensity, and increases accuracy.

Description

technical field [0001] The invention belongs to the field of ecological research, and in particular relates to a method for measuring leaf area index. Background technique [0002] Leaf Area Index ( leaf area index ) is also called the leaf area coefficient, which is the ratio of the total area of ​​crop leaves on a piece of land to the area occupied. Leaf area index is one of the key parameters in ecological research. It is mainly measured by instruments such as LAI-2000 and fisheye camera. The principle of leaf area measurement of such instruments is based on Miller's law and Bell's law. The measured leaf area index is generally lower than the real leaf area index, which is an effective leaf area index, and there is a certain error, and its accuracy is low. Using the harvest method to measure the leaf area is true, but the labor intensity is high, the efficiency is low, the environment is damaged, and it is difficult to recover. Contents of the invention [0003] The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/28
Inventor 范文义李明泽杜春雨于颖毛学刚鲍晨光
Owner NORTHEAST FORESTRY UNIVERSITY
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