Soil pH value two-dimensional dynamic distribution detection device

Abstract

The invention discloses a soil pH value two-dimensional dynamic distribution detection device, and belongs to the technical field of soil detection in environmental science. The device comprises a soil culture box, a digital single lens reflex camera, an LED light source, a synchronous control switch and a computer terminal, wherein a soil pH value sensing film is arranged at the bottom in the soil culture box; the digital single lens reflex camera is arranged right below the soil pH value sensing film in the soil culture box; and the LED light source is arranged at a proper position obliquelybelow the soil culture box. And the synchronous control switch is respectively connected with the digital single lens reflex camera, the LED light source and the computer terminal. A fluorescence intensity image of the soil pH value is obtained in real time by adopting a photographing imaging technology, and the soil pH value is metered and detected according to the obtained image. The system structure is simple, the actual operation is convenient, the two-dimensional distribution of the pH value of the soil is detected in real time in a laboratory, and the dynamic change of the pH value of the soil in time and two-dimensional space can be accurately reflected in real time.

Description

technical field [0001] The invention belongs to the technical field of soil detection in environmental science, and particularly relates to a two-dimensional dynamic distribution detection device for soil pH value. Background technique [0002] Soil pH is one of the key environmental factors regulating soil biogeochemical reactions. The level of pH characterizes the chemical properties of the soil solution, which has an important impact on soil fertility, especially on the existing form, availability and utilization efficiency of plant nutrients in the soil, the activity and community composition of soil microorganisms, and the plant itself. growth is significantly affected. Most of the processes at the soil-root interface and soil-fertilizer interface reflect the physical, chemical and biological effects of the soil microenvironment at a microscale (submillimeter). Biochemical reactions in the soil, dissolution-precipitation reactions of inorganic fertilizers, degradation...

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Problems solved by technology

The pH colorimetric method has the advantages of simplicity, no need for expensive instruments, less restrictions on measurement conditions, and convenience for field investigations, etc., but its accuracy is low, and it cannot measure soil pH in situ in real time.

[0003] The pH glass electrode based on electrochemical measurement technology is currently the most widely used and mature pH measurement method. This method has the advantages of accuracy (0.001pH unit), fast and convenient, but the measurement object is limited to homogeneous fluid matrix such as solution. , not suitable for in-situ measurement of soil

The pH detection technology developed rapidly in recent years mainly includes microelectrode method and optical fiber sensor, which have the characteristics of high resolution, high accuracy and in-situ measurement. Although they can be applied to soil pH detection, they can only achieve single-point measurement. In addition, microelectrodes are expensive, difficult to maintain, and cumbersome to operate, and it is impossible to obtain real-time two-dimensional distribution information of soil pH.

Such monitoring obviously fails to reveal the true complexity of natural soils, especially in the soil-root system and soil-fertilizer system, where environmental heterogeneity is higher, and the use of these techniques cannot fully express the spatiotemporal dynamic distribution of soil pH

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