Soil eluviation in situ detection method

Abstract

The invention discloses a soil leaching liquor in-situ measurement method, which belongs to the research field of environmental science, soil science and plant nutrition. The soil leaching liquor in-situ measurement method of the invention includes the following steps: a soil profile in the vertical direction is obtained and a horizontal cave is dug based on the target depth of the soil profile; a horizontal leaching plate is arranged in the cave to collect the leaching liquor, and the leaching liquor in the leaching plate can automatically flow into a sample bottle through an outlet pipe; soil of the soil layer with a corresponding depth is used for filling the cave; according to the steps, a vertical waterproof wall body is built along the vertical soil profile to ensure that the outlet pipe can pass through the wall body; meanwhile, the soil is backfilled layer by layer and then compacted layer by layer, and moreover, in order to recover the raw condition of the backfilled soil as possible, the backfilled soil is irrigated for a plurality of times. The soil leaching liquor in-situ measurement method of the invention is especially suitable for monitoring the influence caused by the soil leaching liquor of such soil solute as nitrogen, phosphorus and pesticide, etc. to the groundwater; particularly, under the condition of realizing the in situ monitoring, the sampling difficulty is reduced and the sampling process becomes simple and fast.

Description

technical field [0001] The invention relates to an in-situ detection method for soil leaching, which belongs to the research fields of environmental science, soil science and plant nutrition. This method 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 farmland soil Simulation...

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, a relatively accurate, simple and economical in-situ soil leaching method should be studied. The detection method will have broad development prospects in the field of soil leaching research

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