Soil evaporation potential measuring method and device

Abstract

The invention relates to a soil evaporation potential measuring method which comprises the following steps: original soil is contained in an outer sleeve and connected with a water pressure constant device for ensuring the constancy of soil water; an inner barrel is installed in the soil; the bottom of the inner barrel is provided with a weighing sensor and the water pressure constant device; theweighing sensor is connected with a reading meter; a measuring barrel for containing original soil and the water pressure constant device is arranged on the weighing sensor in the inner barrel; the mass change induced by the weighing sensor is obtained by the reading meter; and the mass difference after fixed time interval is the soil evaporation amount of the time interval. The method ensures that the soil evaporation measurement eliminates the interference factor influence as much as possible and only embodies the influence of the soil surface characteristics and evaporation environment, and a measuring value approaches the soil potential evaporation amount of the soil. The method can use the devices which comprise the outer sleeve, the inner barrel, the measuring barrel, a water supplypipe A, a connecting pipe, a Marriott bottle A, the weighing sensor, the weighing reading meter, a Marriott bottle B and a water supply pipe B and has the advantages of simple structure and convenience in use.

Description

technical field [0001] The invention belongs to the technical field of farmland water balance observation, and in particular relates to a soil evaporation potential measurement method and a device thereof. Background technique [0002] Soil evaporation refers to the process in which soil moisture escapes into the atmosphere in the form of vapor through the soil surface. Soil evaporation potential, that is, soil potential evaporation, refers to the amount of water evaporated from the soil when the soil is supplied with unlimited water. In the actual soil evaporation process, when the soil water content is greater than the field water capacity, its evaporation is close to the soil evaporation potential. The soil evaporation at this time is only affected by the soil surface characteristics and evaporation environment. [0003] Using containers to store soil in the measurement of soil evaporation potential is prone to two problems: one is that the water supply capacity of the ...

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Problems solved by technology

[0003] Using containers to store soil in the measurement of soil evaporation potential is prone to two problems: one is that the water supply capacity of the soil decreases during the evaporation process, which deviates from the basic requirements of the concept of soil potential evaporation; the other is that the external environment of the container will interfere with the measurement container, mainly solar radiation Temperature and air temperature cause a large amount of heat conduction from the bottom and outer wall of the measurement container to the container, which makes the measurement results deviate from the basic requirements of the concept of soil potential evaporation

In view of various difficult factors, general meteorological and hydrological stations do not conduct soil evaporation observations, nor do they conduct observations of soil evaporation potential

[0004] Measuring soil evaporation potential can establish a relationship model between meteorological factors, soil properties and soil evaporation, which can be used for soil evaporation forecasting, but there is still a lack of a simple method and device for effectively measuring soil evaporation potential

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