Field soil water potential measuring instrument as well as using method thereof

Abstract

The invention provides a field soil water potential measurement instrument. The field soil water potential measurement instrument comprises a base, an induction sleeve, an outer sleeve and a pressure sensor, wherein the base is provided with a cavity body and a conical base; a water exhaust hole is formed in the conical base of the base, and is communicated with the cavity body; one end of the pressure sensor extends into the cavity body of the base, and is tightly connected with the base; the outer sleeve sleeves the outer sides of the pressure sensor and the base; the outer periphery of the base is provided with a groove around the cavity body; a prefabricated water permeation hole is also formed in the base; the prefabricated water permeation hole is communicated with the groove and the cavity body; the induction sleeve sleeves the base and covers the outer side of the groove. The field soil water potential measurement instrument provided by the invention is assembled in air-free water so as to guarantee that the internal cavity body has no air bubble; moreover, the saturation steps are simple, the saturation effect is good, and vaporization is difficult; the base is provided with the conical base, which is even beneficial to the setting of the field instrument, and the field instrument can be in favorable contact with the soil body. The invention also discloses a using method of the field soil water potential measurement instrument.

Description

technical field [0001] The invention relates to an on-site soil water potential measuring instrument and a using method thereof. Background technique [0002] The water potential in the soil can not only reflect the dryness and wetness of the soil, but also effectively reflect the difficulty of plants absorbing water. Moreover, soil water potential is used as another variable different from stress in soil mechanics and other disciplines. Therefore, the measurement of soil water potential is very important, especially the on-site soil water potential measurement data is more valuable. [0003] In the prior art, a soil tensiometer is usually used to measure the water potential (pore pressure) in the soil, which is widely used in agriculture, forestry, and geotechnical engineering. However, the saturation process of traditional tensiometers is complicated, easy to vaporize, and is greatly affected by temperature and soil lateral pressure. The positive pressure generated durin...

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Problems solved by technology

However, the saturation process of traditional tensiometers is complicated, easy to vaporize, and is greatly affected by temperature and soil lateral pressure. The positive pressure generated during installation will cause damage to the sensing parts, and it can only measure the water potential of the surface soil, which is not suitable for field use.

Moreover, due to the complex conditions on site, the deep measurement position, the use is limited, the water potential sensor is easily damaged during the installation process, and there is no vacuum saturation process, which results in poor saturation effect, poor measurement response time and accuracy, especially not Suitable for deep suction measurement, only suitable for indoor experiments, and the process of burial cannot guarantee close contact with the soil

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