7 results about "Compensation point" patented technology

The invention relates to the technical field of agricultural engineering, and discloses a layered multi-light-quality cooperation-based three-dimensional circulating seedling raising system and a light supplementing method thereof.The system comprises a multi-layer circulating conveying structure, a layered light source system, a seedbed movement control system and a PLC; the multi-layer circulating conveying structure is divided into a high-illumination area, a middle-illumination area and a low-illumination area according to light saturation points and light compensation points of rice seedlings, the illumination intensity of the high-illumination area is larger than or equal to 100 PPFD, the illumination intensity of the middle-illumination area is 30-100 PPFD, and the illumination intensity of the low-illumination area is smaller than 30 PPFD; the layered light source system is provided with different light sources for the middle illumination area and the low illumination area. According to the method, the high illumination area, the middle illumination area and the low illumination area are divided, the middle-layer illumination blind area and the bottom-layer weak-light area which cannot be considered by a traditional light supplementing technology are effectively covered, the problems of excessive growth, leaf color lightening, slow growth and the like of seedlings due to continuous weak light or intermittent light shortage are solved, and the consistency and uniformity of seedling groups are guaranteed.

The application discloses a kind of submerged plant recovery condition evaluation and its construction method, belong to environmental engineering technical field, steps are as follows: measure or estimate water surface illumination intensity and measure water transparency;Based on underwater light field calculation method obtains underwater light field information in recovery area;Whether it has recovery condition is evaluated in combination with plant population and community light compensation point data;For the area without condition, wind wave influence is evaluated using wind wave influence evaluation method on sediment, and combined with ecological enclosure, fish removal, bottom comprehensive improvement aid and microbial compound microbial agent measures, improve water transparency and other water quality conditions, complete submerged plant recovery.The application is simple, efficient, and the construction measures are scientific, reasonable, economical and convenient, which can effectively improve the survival rate of submerged plants.

To provide a plant cultivation method capable of effectively adjusting growth of plants.SOLUTION: Growth of a plant to be cultivated is adjusted by performing irradiation of main light for photosynthesis of the plant, and irradiation of additional signal light whose light intensity is lower than a light compensation point of the plant, which periodically fluctuates, and is capable of causing the plant to perceive a daytime condition in a non-daytime situation. A time period of irradiation of the additional signal light includes a time period during which a light intensity of the main light for photosynthesis is lower than the light compensation point. A wavelength band of the additional signal light is from 350 nm to 750 nm.SELECTED DRAWING: Figure 2

The invention belongs to the technical field of urban greening, and particularly relates to an under-bridge plant configuration method and system based on quantitative analysis of an illumination environment under a viaduct, and the method comprises the steps: building a three-dimensional space model through combining a viaduct structure and the environment; deploying monitoring points to actually measure illumination intensity data under the bridge in different seasons; carrying out solar radiation simulation by combining meteorological data, generating a photosynthetically active radiation distribution diagram, and verifying and fusing the photosynthetically active radiation distribution diagram and actually measured data; establishing a light adaptation feature database containing plant light compensation point and light saturation point parameters; the illumination distribution and other environmental factor data are fused, a fuzzy comprehensive evaluation algorithm is adopted to calculate a light ecological suitability index, and under-bridge space suitability grades are divided; and finally, matching each suitable-for-life grade sub-region with the plant light adaptation feature database to generate a sub-region plant configuration scheme. According to the method, the blindness problem existing in a traditional empirical plant configuration method is solved, scientization and precision of plant selection under the viaduct are achieved, and the plant survival rate and the landscape effect are remarkably improved.

The plant growth suppression method according to the present disclosure includes a step of, within a single day, irradiating a plant with suppression light including left circularly polarized light during a second time period that is different from a first time period during which the plant is irradiated with growth light. The photon flux density of the suppression light is a value below the light compensation point of the plant.

To provide a plant cultivation method capable of effectively adjusting growth of plants.SOLUTION: Growth of a plant to be cultivated is adjusted by performing irradiation of main light for photosynthesis of the plant, and irradiation of additional signal light whose light intensity is lower than a light compensation point of the plant, which periodically fluctuates, and is capable of causing the plant to perceive a daytime condition in a non-daytime situation. A time period of irradiation of the additional signal light includes a time period during which a light intensity of the main light for photosynthesis is lower than the light compensation point. A wavelength band of the additional signal light is from 350 nm to 750 nm.SELECTED DRAWING: Figure 2

The present application relates to the field of environmental engineering technology, and in particular to a device, system and method for determining the species of submerged plants that can be restored in a water area, wherein the device includes: a suspended matter sensor, a water depth sensor and a positioning device, which are respectively used to obtain the suspended matter concentration information, the water depth information of the measurement point and the geographical information of the target water area; a communication device uploads the geographical information to a cloud server and obtains the average daily light intensity sent by the cloud server; a processing device is used to calculate the light compensation point value of the target water area based on the suspended matter concentration information, the water depth information of the measurement point and the average daily light intensity, and determine the submerged plant species that can be restored in the target water area based on the light compensation point value of the target water area. Thus, the problem of estimating the underwater light conditions that can restore submerged plants by the ratio of water transparency to water depth in the related art is solved, and the problem of poor accuracy of the determination result and low applicability due to differences in sunlight intensity, submerged plant species, etc. is solved.