Novel leaf area index instrument and leaf area index measuring method thereof

Abstract

The invention discloses a novel leaf area index instrument and a leaf area index measuring method thereof, and the leaf area index instrument comprises a fisheye lens, a camera module, a data collector, an image analysis module and a power supply module. The fisheye lens and the camera module are respectively connected with the data collector, the data collector is in communication connection with the image analysis module through GPRS, and the power supply module is a solar cell panel and is connected with the battery pack. The fisheye lens and the camera module are controlled through the data collector, hemispherical digital images of plant canopies are automatically obtained at regular time, then the images are sent to the image analysis module through a GPRS network, a local end can obtain the hemispherical digital images through the image analysis module, the images are analyzed through corresponding software, and finally the leaf area index value is calculated.

Description

technical field [0001] The invention relates to the technical field of leaf area index observation, in particular to a novel leaf area index meter and a method for measuring the leaf area index. Background technique [0002] Vegetation is a key component of the earth system, and leaves are the main carrier of vegetation for photosynthesis, respiration, transpiration and other physiological processes. Leaf Area Index (LAI) is an important surface vegetation parameter that characterizes the degree of leaf density and describes the vegetation growth state and canopy structure. It is usually defined as half of the total leaf surface area per unit land surface area. Continuous monitoring of LAI can quickly measure ecosystem productivity and simulate the evolution of community ecological processes, and is widely used in ecosystem research. [0003] At present, LAI measurement methods are mainly divided into direct method and indirect method. Direct methods mainly include litter ...

AI Technical Summary

Problems solved by technology

At present, the LAI measurement optical instruments on the market are all portable. Although they are easy to operate, they are not suitable for long-term fixed monitoring instruments. The resulting measurement error cannot achieve accurate positioning observation and reduces the comparability of observation data

[0005] Existing image-based optical measuring instruments often use hemispherical photography to obtain canopy images through fisheye lenses and digital cameras. analysis work, and then calculate the value of leaf area index, but there are many limitations in actual measurement

Taking HemiView as an example, in addition to the above-mentioned shortcomings, there is also the problem of limited battery capacity of the camera, and frequent battery replacement is required for long-term measurement, which is not suitable for large-scale fixed-sample monitoring

[0006] To sum up, since the leaf area index is a key parameter for studying the energy exchange of terrestrial ecosystems, researchers in my country's agriculture, forestry, and remote sensing sciences have a large demand for measuring instruments, but at this stage, the instruments are expensive and difficult to measure for a long time. Position monitoring, unable to transmit data in real time, limited battery capacity, time-consuming and labor-intensive, and unable to guarantee measurement accuracy, etc., so self-developed a set of automatic leaf area index measuring instruments with low cost, timing and positioning observation, to break foreign monopoly and meet domestic Market demand and scientific research are of great significance

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