The plant canopy is the part of the plant stem above the epiphytic foliage. This structure is used to assess the growth of plants.
The plant canopy is mainly related to the following aspects: 1. The utilization of light energy by plants, such as the amount of light transmitted, the amount of reflection; 2. The fixed CO2 of the leaves of plants during photosynthesis; 3. The transpiration of plants during growth The size and so on. Alive
There is a parameter in the field of material science and production called "foliar index", also called "leaf area index" or "leaf area factor" to reflect the overall growth of plants in the area. Calculation formula: leaf area index = total area of ​​green leaves / floor area.
The plant canopy is used as the first part of the plant to contact the external gas environment and illumination, so it is used to analyze and calculate the leaf area index. So the size of the canopy can be reflected by the leaf area index. The leaf area index reflects the size of the crop population. Within a certain range, crop yield increases as the leaf area index increases. When the leaf area is increased to a certain limit, the overlap of the leaves occurs between the plants, the illumination cannot be fully utilized, the photosynthetic efficiency is weakened, and the yield is decreased. Therefore, the canopy analyzer is widely used in agricultural production and agricultural research. It provides an important basis for the investigation of canopy light energy resources, measuring the interception of light in plant canopies, and studying the relationship between crop growth and development, yield quality and light energy utilization. .
Common measuring instruments: TRAC (short for Tracing Radiation and Architecture of Canopies) is an optical instrument for detecting plant leaf area index and vegetation to absorb photosynthetically active radiation. TRAC is analyzed by gap size distribution and photosynthetically active radiation. Using wireless ZigBee technology, the smart sensor and PDA are combined to transmit real-time data to the PDA for display, which enhances the on-site intuitiveness, and the PDA has built-in TRAC software, which can be analyzed on the spot. Main components and features: DJ-TRAC is mainly composed of PDA, intelligent sensor and analysis software. Detection parameters: leaf area index, photosynthetically active radiation, cluster index, gap rate, photosynthetically active radiation absorption component, etc.
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