Farmland underground eluviation in-situ monitoring device

Abstract

The invention discloses a farmland underground leaching in-situ monitoring device, which belongs to fields of environmental science, soil science and plant nutrition research. The device of the invention includes leaching disc, outlet pipe and sample bottle. The leaching disc is an impervious container, the upper part is opening for collecting leaching water; the lower part of the leaching disc is equipped with outlet; the outlet pipe is a waterproof bi-pass aqueduct, one end is connected with outlet of leaching disc, the other end is connected with the outlet of the sampling bottle, the leaching fluid in the leaching disc can automatically go through the outlet pipe into the sampling bottle; the sampling bottle is a waterproof container, the upper part is equipped with an inlet, which isused for collecting leaching fluid from the leaching disc. The device of the invention is particularly suitable for monitoring the effect of leaching of nitrogen, phosphorus, farm chemical and other soil solutes to underground water, especially under the condition of monitoring in-situ, which reduces the difficulty of sampling and makes the sample process simple and fast.

Description

technical field [0001] The invention relates to an in-situ monitoring device for underground leaching in farmland, which belongs to the research fields of environmental science, soil science and plant nutrition. The device is especially suitable for monitoring the impact of leaching of nitrogen, phosphorus, pesticides and other soil solutes on groundwater, especially under the condition of realizing in-situ monitoring, which reduces the difficulty of sampling and makes the sampling process simple and fast. Background technique [0002] The pollution of groundwater by nitrogen leaching from soil is not only an important agricultural problem, but also an important problem that threatens human health and survival. Studies have shown that about 30% to 50% of the fertilizers applied to the soil in the world enter the groundwater through soil leaching (Bi Jingwei, Zhang Jiabao, Chen Xiaomin, etc.: "The relationship between soil water leakage and nitrate nitrogen leaching in farmla...

AI Technical Summary

Problems solved by technology

[0003](1) The indoor soil column simulation method is simple, fast and easy to control, but it cannot accurately reproduce the actual field environment

[0004] (2) The seepage tank method overcomes the shortcomings of the indoor soil column simulation method, but it needs to dig a huge trench for sample collection, which requires a large amount of construction and high cost

Its main disadvantage is that the external pressure changes the soil water flow field, and it is impossible to accurately measure the actual flux of the field leaching solution and the migration process of the actual soil solute.

[0006] (4) The main problem of the clay suction cup method is the high cost, and only a certain point of soil solution can be collected during sampling. To know the solution status of the entire soil section, it is necessary to insert Multiple collectors lead to a substantial increase in cost

[0007](5) The sump method overcomes the shortcomings of the clay suction cup method, but when installing the sump, it is necessary to excavate the soil above the sump, which destroys the soil in the natural state water movement status

[0008] Therefore, in the absence of a standard method for soil leaching monitoring at home and abroad, researching a relatively accurate, simple, and economical in-situ monitoring device for underground leaching in farmland will have broad development prospects in the field of soil leaching research.

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