Method for measuring unsaturated soil hydrodynamic parameters by using pressure plate/pressure film effluent process

Abstract

The invention provides a method for measuring unsaturated soil hydrodynamic parameters by using a pressure plate / pressure film effluent process. The method comprises the following steps of measuring a water characteristic curve, diffusivity and hydraulic conductivity of unsaturated soil, and specifically comprises the following steps of preparing a soil sample: a disturbance soil sample or a non-disturbance soil sample; connecting a measuring device, by adjusting an air compressor for compression, controlling the pressure level, and then adjusting the pressure to be sent to an extractor; when adjusting the pressure, recording time, recording the total displacement after realizing stability and obtaining the water characteristic curve; further, through a 'multi-step method' and a 'one-step method', measuring the unsaturated hydraulic conductivity and diffusivity of the soil under continuous pressure change and selective pressure conditions, so that synchronous measurement of all the unsaturated soil hydrodynamic parameters is realized. The method provided by the invention can more accurately predict the movement of unsaturated soil moisture and provide the support for realizing accurate measurement of agricultural production and ecology.

Description

technical field [0001] The invention belongs to the technical field of agriculture, in particular to a method for measuring unsaturated soil hydrodynamic parameters by a pressure plate / pressure film outflow method. Background technique [0002] With the increasingly prominent problems of water resources and environment, the research on water movement in soil has become an important topic. Soil moisture movement is a complex process, which is closely related to many factors such as irrigation methods, soil conditions and external environment. Soil moisture status directly or indirectly affects the status of soil gas and Jehol fat, and is related to crop harvesting and soil fertility. As well as the physical, chemical and biological processes inside the soil, it is of great significance to the accurate measurement and research of agricultural production and ecology. [0003] To solve the unsaturated soil water movement equation and then predict the unsaturated soil water move...

AI Technical Summary

Problems solved by technology

Different methods are used to measure different hydrodynamic parameters separately, and the state consistency of the corresponding nodes of the parameters cannot be guaranteed.

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