Buoyancy type soil lysimeter

Abstract

The invention discloses a buoyancy type soil lysimeter, which comprises an undisturbed soil cylinder provided with a filter; the filter is connected with a phreatic water evaporating and replenishing device through a water level communication pipe; the phreatic water evaporating and replenishing device is connected with a precipitation infiltration replenishing measuring pot through a precipitation infiltration replenishing pipe; a buoyancy cylinder used for driving the undisturbed soil cylinder to float is assembled on the outer wall of the undisturbed soil cylinder; the phreatic water evaporating and replenishing device and the precipitation infiltration replenishing measuring pot are arranged in the buoyancy cylinder; the buoyancy type soil lysimeter also comprises an outer cylinder; a water level measuring chamber is fixedly connected on the outer wall of the outer cylinder; the water level measuring chamber is communicated with the outer cylinder; and the undisturbed soil cylinder and the buoyancy cylinder are arranged in the outer cylinder. According to the invention, the soil evaporation amount, the precipitation infiltration replenishing amount and the phreatic water evaporation amount of an undisturbed soil pillar for a test can be observed at the same time, so that changes of storage vibration in an unsaturated soil body can be understood, water balance analysis can be performed on undisturbed soil, and hydrology parameters, required water yield of crops and change rules of the required water yield can be solved through a water balance equation.

Description

[0001] technical field [0002] The invention relates to the field of soil moisture observation instruments, in particular to experimental observation instruments for soil evaporation, precipitation infiltration replenishment and submerged evaporation. Background technique [0003] Soil evaporation refers to the amount of water in the soil that enters the atmosphere from the soil surface through capillary rise and gasification; precipitation infiltration recharge refers to the amount of water that saturates the upper soil and replenishes the groundwater below the free water surface due to precipitation infiltration; phreatic evaporation The amount of water refers to the amount of water that rises from the water table to the upper soil or enters the atmosphere under the action of heat and crop roots. Research on the "four water transformation" of the hydrological cycle, research on hydrogeological parameters, crop water demand and other research and experiment fields usually ...

AI Technical Summary

Problems solved by technology

Research on the "four water transformation" of the hydrological cycle, research on hydrogeological parameters, crop water demand and other research and experiment fields usually involve soil evaporation, precipitation infiltration recharge, and submerged evaporation observation experiments. Traditional experimental observation instruments include: soil evaporators and subterranean evaporation. The infiltration meter and the soil evaporator can only observe the soil evaporation, but cannot control the groundwater level of the undisturbed soil used in the experiment, and cannot observe the precipitation infiltration recharge and phreatic evaporation, and the existing soil evaporation is measured by weighing the soil column. The method is more troublesome in actual operation; although the subsurface lysimeter can observe the precipitation infiltration recharge and phreatic evaporation, it cannot observe the soil evaporation at the same time, and it is difficult to analyze the water balance of the undisturbed soil, which brings inconvenience to the research , and even affect the reliability of experimental results

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