Natural state soil leachate collecting method

Abstract

The invention discloses a soil leaching liquor collection method under natural conditions, which belongs to the research field of environmental science, soil science and plant nutrition. The soil leaching liquor collection method of the invention mainly includes the following steps: a soil profile in the vertical direction is obtained and the dug-out soil is piled up layer by layer according to depth; a horizontal cave is dug based on the target depth of the soil profile and the upper surface of the cave is guaranteed to be level; a leaching plate is inserted into the cave and slurry modulated out of soil of the soil layer of the target depth is placed into the leaching plate; the dug-out soil is backfilled layer by layer and then compacted layer by layer, 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 method of the invention can realize collecting and monitoring the soil leaching liquor under natural conditions, in particular is suitable for monitoring the influence caused by the soil leaching liquor of such soil solute as nitrogen, phosphorus and pesticide, etc., on the groundwater.

Description

technical field [0001] The invention relates to a method for collecting soil drench solution in a natural state, belonging to the research fields of environmental science, soil science and plant nutrition. This method is particularly suitable for monitoring the impact of leaching of nitrogen, phosphorus, pesticides and other soil solutes on groundwater. 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 Research", "Journal of Irrigation and Drainage", 2003, 22[6]). In the past, it was generally believed that the leaching loss of phospho...

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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 that only a certain point of soil solution can be collected during sampling. To know the solution status of the entire soil section, multiple collectors need to be inserted, resulting in 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, research on a relatively simple, economical, and accurate method for collecting soil leaching solutions will have a wide-ranging development prospect in the field of soil leaching research.

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