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Measuring method of leaf area index

A leaf area index and measurement method technology, applied in the field of ecological research, can solve the problems of low accuracy of leaf area index, high labor intensity, and environmental damage

Inactive Publication Date: 2010-07-28
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

Method used

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  • Measuring method of leaf area index
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specific Embodiment approach 1

[0006] Specific embodiment 1: The method for determining the leaf area index in this embodiment is achieved through the following steps: 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 grades and air humidity 10%~90%; 2. The data measured in step 1 is processed and output by the built-in software of LAI-2000 plant canopy analyzer, that is, the obtained Effective leaf area index; 3. Bring the effective leaf area index into the following formula to calculate the leaf area index (LAI): leaf area index (LAI) of broad-leaved forest = 1.5457 × effective leaf area index -0.0414; that is, the leaf area is completed Determination of the index.

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

specific Embodiment approach 2

[0008] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the measurement time is from 11:00 to 13:00. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0009] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the intensity of the light is 8500-9500 Lux. Other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention relates to a measuring method of leaf area index, belonging to the ecological study field. The invention solves the problems of the prior art that the leaf area index measured by LAI-2000 has low accuracy, and the harvest method for measuring the leaf area index has large labor intensity and low efficiency. The method of the invention comprises the following steps: 1. placing an LAI-2000 plant canopy analyzer 3.5 away from the edge of a leaf, measuring under the condition that the measuring time is 10:00-14:00, the light Intensity is 8000-10000Lux, the wide speed is 7-level and the air humidity is 10-90%; 2. obtaining an effective leaf area index; and 3. substituting the effective leaf area index in the following formula: leaf area index of broad-leaved forest=1.5457*effective leaf area index-0.0414 or leaf area index of coniferous forest=0.9651*effective leaf area index+0.4115, thus completing the measurement of leaf area index. The method can increase the measuring efficiency, reduce the labor intensity and increase the accuracy.

Description

technical field [0001] The invention belongs to the field of ecological research, and particularly relates to a method for determining a leaf area index. Background technique [0002] Leaf Area Index ( leaf area index ), also known as the leaf area coefficient, is the ratio of the total area of ​​crop leaves on a piece of land to the floor area. Leaf area index is one of the key parameters in ecological research. It is mainly measured by LAI-2000, fisheye camera and other instruments. The leaf area measurement principle of such instruments is based on Miller's law and Bell's law. Compared with the real leaf area index, the measured leaf area index is generally lower than the actual leaf area index, which is the 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 it is labor-intensive, low-efficiency, damages the environment, and is difficult to restore. SUMMARY OF THE INVENTION ...

Claims

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Application Information

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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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