Method for measuring effective leaf area index (LAI) of rubber plantation by using LAI-2000 canopy analyzer

A technology of LAI-2000 and area index, which is applied in the field of ecological research, can solve the problems of measurement error and other problems, and achieve the effect of small measurement error

Inactive Publication Date: 2013-05-01
RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of method that utilizes LAI-2000 canopy analyzer to measure the effective leaf area index of rubber plantation for the deficiencies in the prior art, solve LAI-2000 canopy analyzer when using a single probe pattern due to the use of fixed A value leads to a large error in measurement results

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  • Method for measuring effective leaf area index (LAI) of rubber plantation by using LAI-2000 canopy analyzer
  • Method for measuring effective leaf area index (LAI) of rubber plantation by using LAI-2000 canopy analyzer
  • Method for measuring effective leaf area index (LAI) of rubber plantation by using LAI-2000 canopy analyzer

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[0027] 1. Experimental content

[0028] Comparison of rubber forest leaf area index with red light (B3), near-infrared (B4), normalized difference vegetation index (NDVI), ratio vegetation index (SR) and soil-adjusted vegetation index (SAVI) of environmental satellite remote sensing images Taking the relationship as an example, comparative analysis adopts and does not adopt the difference between the method of the present invention.

[0029] 2. Experimental data

[0030] The rubber forest leaf area index data of the experimental farm of the Chinese Academy of Tropical Agricultural Sciences in Danzhou City, Hainan Province, the specific acquisition time is March and the end of April 2012, of which 21 sample points were in March, and April was based on March 4 sample points have been added for a total of 25 sample points.

[0031] The CCD image data of the two environmental satellites were acquired on March 23, 2012 and May 3, 2012, respectively, which is basically the same as...

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Abstract

The invention relates to a method for measuring an effective leaf area index (LAI) of a rubber plantation by using an LAI-2000 canopy analyzer. The method comprises the following steps of: firstly measuring an A value on an open ground close to the rubber plantation to be measured, then measuring a B value of the rubber plantation and next quickly returning to the open ground to measure the A value again; exporting and saving original experimental measurement data by using software; establishing a linear interpolation equation by using measurement time and numerical values of the two A values and interpolating to generate a corresponding A value according to the measurement time of each B value; and saving an interpolation result and calculating the effective LAI by applying FV2200. According to the design of the invention, sky solar radiation changes linearly in a short time, a linear interpolation program is established according to the A value of the rubber plantation to be measured, a corresponding A value is generated for each B value, the problem of large error of the measurement result caused by use of a fixed A value in a single-probe mode of the LAI-2000 canopy analyzer is solved, the error of the measurement result is small, and the information on a vegetation canopy structure of the rubber plantation can be reflected better.

Description

technical field [0001] The invention belongs to the field of ecological research, and relates to a method for measuring the ecological structure parameters of rubber forests, in particular to a method for measuring the effective leaf area index of rubber forests by using a LAI-2000 canopy analyzer. Background technique [0002] Leaf Area Index LAI (Leaf Area Index) usually refers to the sum of the surface areas of all leaves per unit land area, or the sum of the vertical projected areas of plant leaves per unit area. Leaf area index is an important parameter of vegetation canopy structure. The size and distribution of leaf area directly affect many biophysical processes of vegetation, such as photosynthetic respiration, transpiration and precipitation interception, carbon energy, etc. An important parameter of the magnitude of the system's matter and energy exchange. [0003] my country has about 1 million hectares of rubber forests. Accurately measuring the leaf area index...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/28
Inventor 陈帮乾吴志祥谢贵水管利民兰国玉王纪坤陶忠良
Owner RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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