A sunlight-induced chlorophyll fluorescence measurement system that can adapt to the observation of the whole growth period of crops

Abstract

The invention discloses a sunlight-induced chlorophyll fluorescence measurement system that can be adapted to the observation of the whole growth period of crops, including a SIF measurement device and a crop canopy height measurement device; the SIF measurement device includes a SIF sensor probe for measuring the radiance information of the canopy and the irradiance information of the sky; the crop canopy height measuring device includes: a ranging sensor, used to obtain the height information of the crop canopy; an intelligent control unit, according to the crop canopy height information, calculates the distance that the SIF sensor probe needs to lift , and send a lift command to the execution unit; the execution unit adjusts the height of the SIF sensor probe according to the lift command sent by the intelligent control unit, so that the distance between the SIF sensor probe and the crop canopy remains constant throughout the growth period. The sunlight-induced chlorophyll fluorescence measurement system of the invention can automatically adjust the height of the SIF sensor probe according to the height of the crop canopy, thereby obtaining more reliable crop sunlight-induced chlorophyll fluorescence information.

Description

technical field [0001] The invention relates to the technical field of crop remote sensing, in particular to a sunlight-induced chlorophyll fluorescence measurement system which can be adapted to observe the whole growth period of crops. Background technique [0002] Photosynthesis is the most important life process of plant growth and development. It not only affects the plant's carbon dioxide fixation, water and other material cycles, but also can directly reflect the life activity state of plants. At present, there is still a lack of non-destructive remote sensing methods that can effectively detect photosynthesis information of plant canopies. Solar-Induced Fluorescence (SIF) is closely related to vegetation photosynthesis, and has increasingly become an effective means to monitor the photosynthesis status of crops. [0003] Under natural light conditions for crops, there are three ways to use the sunlight absorbed by plants: most of it is used for the photochemical reac...

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Problems solved by technology

[0004] However, there are still some problems in the current near-ground SIF measurement system in the field. Since the sensor probe has been fixed at a certain height from the ground, but as the crop grows, the height of the crop canopy will increase accordingly. If the height of the SIF sensor probe is not The corresponding adjustment will affect the accuracy of the SIF sensor probe to detect the crop range, because the field angle of the SIF sensor probe will not change. Although the height of the SIF sensor probe is fixed, as the height of the plant canopy rises, the final SIF sensor probe distance The height of the canopy will also be reduced accordingly, and the field of view of plants measured by the SIF sensor probe will also be reduced. In the end, there will be fewer and fewer plant samples left in the field of view. The change of the test object makes it difficult for us to accurately track specific plants Chlorophyll fluorescence data of the whole growth cycle of the canopy

At the same time, changes in the height of the sensor probe and the plant canopy will also affect the extraction of fluorescence data, because the SIF measurement system mainly extracts fluorescence parameters based on the oxygen absorption peak in the solar spectrum. If the distance between the sensor probe and the measurement object (plant canopy) Changes in the thickness of the air layer will inevitably change the size of the absorption peak, which will also affect the subsequent extraction of chlorophyll fluorescence data

Therefore, it is difficult to obtain valuable chlorophyll fluorescence data of the whole growth cycle of plants if the corresponding height adjustment is not carried out as the growth height of the crop changes.

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