A saturated and convenient high-range soil water potential device and its application method

Abstract

A kind of saturated and convenient high-range soil water potential device and using method of the present invention, comprising electric method high-range water potential device, saturation shell device, peripheral device and electric method device; The bottom of the water potential sensing part is provided with a force unit and negative electrode, and there is a gap between the water potential sensing part and the force unit and negative electrode, which is set as an internal cavity, and the strain sensing part is connected under the force unit and negative electrode; the saturated shell The device includes a shell set outside the shell, and a free water cavity is arranged inside the shell; the peripheral device includes a vacuum pump, which is connected to the free water cavity through two pipelines, one of which is directly connected, and the other pipeline is set There are airless water reservoirs and valves. The measuring range of the invention can reach 0-1500kPa, and the saturation time is short, and the use is convenient.

Description

technical field [0001] The invention belongs to the field of soil detection, and in particular relates to a saturated and simple high-range soil water potential device and a use method. Background technique [0002] Soil water potential is widely used in agriculture, forestry, and geotechnical engineering, etc., mainly because the suction can not only calculate the moisture content of the soil (there is a nonlinear relationship curve with the moisture content of the soil—soil-water characteristic curve), but also directly reflect the plant root system. The water absorption capacity is a state variable of soil deformation. In the field of agriculture and forestry, the irrigation schedule is determined by means of the measurement of suction; in geotechnical engineering, the deformation of the soil during the dry-wet cycle is predicted according to the change of suction. The measurement technology of soil water potential has attracted much attention. [0003] The Chinese pate...

AI Technical Summary

Problems solved by technology

[0005] However, the range of these soil water potential measurement technologies is only 0~-100kPa, which belongs to the common range

Measurements not possible on drier soils (eg close to plant withering point)

[0006] In order to solve this technical problem, the literature (Chen Rui, Chen Zhongkui, Zhang Min, Deng Gang. 2013. Application of new high-range tensiometer in suction measurement. Journal of Hydraulic Science, Vol. 44(6): 743–747.) proposed A high-range soil water potential device that can measure -500kPa, but its preparation process is very complicated, especially in the loading / unloading process, resulting in a lengthy preparation process, which takes at least 3 days, and it is difficult to meet large-scale and rapid use

Images