Undisturbed soil layered leaching sampling device

Abstract

The invention relates to an undisturbed soil layered leaching sampling device which comprises an undisturbed soil body assembly and a leaching solution water collecting device used for collecting a leaching solution of the undisturbed soil body assembly. According to the invention, sampling of an original-state soil body leaching solution is achieved, damage of backfilling operation to a soil microstructure is avoided, and the regional representativeness of the collected leaching solution is better. Automatic sampling of an initial leaching solution is achieved, the device can operate in an unmanned environment, the collected water sample is the leaching solution which penetrates through an upper aeration zone and leaks at the initial stage, and the device is particularly suitable for rapid solute transport in aeration zone priority flow and non-equilibrium kinetic mechanism research. Synchronous sampling of leaching solutions of multiple layers of a soil body is achieved; except for the difference of aeration zone factors of the corresponding layers, other experimental conditions of each layer are basically consistent, and the influence of the aeration zone thickness on leaching pollutant composition and flux can be analyzed conveniently. Aiming at the layering property of the tested soil and the regional underground water burial depth characteristics, the design of changing the overall soil column, the layering soil column height and the like is conveniently realized.

Description

technical field [0001] The invention relates to a layered leaching sampling device for undisturbed soil, which belongs to the technical fields of environmental science and soil hydrological test. Background technique [0002] Excessive fertilization and use of pesticides in farmland are important causes of shallow groundwater pollution. The soil leaching sampling device is the main device for studying nutrients, pesticides, heavy metals, etc. penetrating the vadose zone into shallow groundwater. At the same time, due to the difference in soil structure between the undisturbed soil and backfill soil in farmland, especially the backfill operation destroys the root system on the surface layer and the preferential channel formed by animal burrows, which affects the infiltration flux and the composition of the drench solution. The dynamic change of groundwater burial depth, that is, the dynamic change of vadose zone thickness, changes the adsorption-desorption kinetic time of nu...

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Problems solved by technology

[0003] At present, there are some patents related to soil column leaching sampling devices, but none of these devices solve the aforementioned problems

For example, the patent titled "Soil Pillar Leaching Device" (Application No. 201410403212.4, Publication No. 104215747B), and the patent named "A Soil Pillar Leaching Device for Simulation of Pollutant Migration" (Application No. 201420645580.5, Publication No. 2014116337U) Both adopt multiple sampling ports on the outside to collect the leach solution. Although this device solves the problem of layered sampling, it cannot distinguish whether the collected leach solution is the leaching water that penetrates the upper vadose zone or the soil column is full of water at the bottom of the column. back water

At the same time, the above-mentioned devices all use the leached soil column as backfill soil, which is not representative of the region.

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