In-situ monitoring and sampling device for percolating water in farmland soil

Abstract

The invention discloses an in-situ monitoring and sampling device for percolating water in farmland soil. The in-situ monitoring and sampling device comprises an undisturbed soil containing barrel, a percolation filter bin, a diversion pipe, a water tank, a sampling pipe, a drain pipe and a water level gauge, wherein the undisturbed soil containing barrel is located above the percolation filter bin; one end of the diversion pipe is connected with an outlet of the percolation filter bin, and the other end of the diversion pipe is located inside the water tank; the lower end of the sampling pipe and the lower end of the drain pipe are inserted into the water tank; the water level gauge is mounted in the water tank. The in-situ monitoring and sampling device disclosed by the invention is reasonable in design and simple in structure, and can be used for comprehensively and quantitatively measuring the percolation process, the leaching loss of nutrients and pesticides and the like in the farmland soil, carrying out the control experiment of water, fertilizer and pesticide coupling management measures, providing data support for the optimal allocation of farmland source elements and reduction of pesticide residues, leaching loss migration and crop absorption, and providing research means for the assessment of water-soil environmental pollution risk.

Description

technical field [0001] The invention relates to the field of agriculture, in particular to an in-situ monitoring and sampling device for farmland soil seepage water. Background technique [0002] The large-scale application of chemical fertilizers, pesticides and livestock manure in farmland may lead to non-point source pollution, which poses a serious threat to the regional ecological environment and human health. It may not only pollute drinking water sources, but may also cause surface water eutrophication and groundwater pollution. . [0003] Agricultural non-point source pollution has the characteristics of large randomness in the formation process, complex influencing factors, wide distribution, far-reaching impact, ambiguous mechanism, long incubation period, delayed occurrence, great harm, and high difficulty in management and control. Every year, huge losses are caused by agricultural non-point source pollution and pesticide pollution accidents, which have a seriou...

AI Technical Summary

Problems solved by technology

[0006] 1) The indoor leaching experiment of the undisturbed or filled soil column is used to explore the migration characteristics of nutrients and pesticides under the simulated rainfall, soil and moisture boundary conditions controlled indoors; the disadvantage of this method is that it cannot simulate the real field changes Hydrothermal conditions and hydrological conditions, the depth and area of ​​the soil column that can be simulated are also small, and it is not suitable for soils with strong mechanization

[0007] 2) In the field, install soil tanks, build runoff plots, or build a soil seepage system (with a basement for monitoring and sampling) in the field, and measure the nutrients in different runoff types on the surface and underground under simulated rainfall or natural rainfall conditions and pesticide migration rules and influencing factors; the disadvantage of this method is that the construction cost is high, the damage area is large during installation, and a long period of stable settlement is required, and once it is completed, it usually cannot be moved to another place for use

[0008] 3) The commercial lysimeter (weighable) needs to be equipped with an underground monitoring and sampling room; the system is very expensive and requires high technical requirements for maintenance

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