Experimental device for simulating water-salt movement in saline-alkali land and method for screening saline-alkali land to prevent salt return by using the device

Abstract

The invention discloses an experimental device for simulating water-salt movement of inland saline-alkali land and a method for screening different salt isolation measures and different coverage measures for preventing salt returning of the saline-alkali land by the experimental device. The experimental device comprises a soil column, a Marriotte bottle, an evaporation control box, a reverse filter layer and moisture, salt and temperature sensors. The soil column is filled with to-be-tested soil mass of the saline-alkali land, the Marriotte bottle is communicated with the lower portion of the soil column to supply water to the soil mass, the evaporation control box is mounted at the top end of the soil column, the reverse filter layer is arranged at the bottom of the soil column, and the moisture, the salt and the temperature sensors are mounted on side walls of the soil column. The experimental device is simple in structure and easy in operation and control of experimental conditions and can be used for laboratory simulation of various experiments such as influences of different measures on soil salinity movement of the saline-alkali land and influences of underground water level on water-salt movement of inland saline-alkali land, measurement results are accurate, and reliable basic data and technical support are provided for inland saline-alkali forestation.

Description

technical field [0001] The invention relates to a device for simulating the movement of water and salt in soil and a method for using the device to measure the rate of salt return in soil, in particular to a test device for simulating the movement of water and salt in saline-alkali land and using the device to screen the difference between preventing salt return in saline-alkali land. A measure method belongs to the field of scientific research instruments of farmland water conservancy engineering. Background technique [0002] The law of water-salt movement is relatively complex, and its change is affected by many factors such as groundwater level, evaporation and rainfall. At present, most of the research and treatment methods on saline-alkali land in my country are aimed at the coastal saline-alkali land where "salt comes with water, and salt goes with water", while there is less research on inland saline-alkali land with less rainfall and strong atmospheric evaporation. ...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a water-salt movement simulation test device for inland saline land and to use the test device to screen inland saline land to prevent salt return in view of the problem that the existing test device for simulating water and salt movement in saline-alkali land only aims at coastal saline-alkali land The method of different salt isolation and covering measures, the device of the present invention is simple and easy to operate, the test results are highly similar to the actual conditions of the inland saline-alkali land, the simulation results are accurate, and accurately reflect the situation of water and salt movement in the inland saline-alkali land, using the test device of the present invention The method for measuring the salt return rate after washing salt in inland saline-alkali land engineering, the measurement result is accurate, and provides basic data and technical support for inland saline-alkali land afforestation

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