Method and device for collecting and measuring leakage water of large-scale rice field undisturbed soil column

Abstract

The invention discloses a method and a device for collecting and measuring leakage water of a large-scale rice field undisturbed soil column. The method comprises the following steps: A, determining a leakage liquid standard collection area according to a base area of the soil column; B, embedding a conic filter at the middle position of the soil column, where an underlying surface is arranged, wherein the middle position is lower than the underlying surface; and completely collecting soil column leakage liquid inside the area at the bottom surface of the conic leakage filter; C. grooving to lead an aqueduct out from the flat surface of the underlying surface of the soil column by utilizing topographic fall head formed when the undisturbed soil column is distributed; and D. firstly opening an air vent of a measurement barrel to ventilate when the leakage liquid is collected, recording the scale of the measurement barrel at regular intervals, uniformly stirring a water sample by a glass rod passing through the air vent of a primary barrel, then opening a sampling pipe valve for sampling, and closing a drain pipe and the sampling pipe valve after water is completely drained, so as to finish the collection and the measurement of the leakage liquid. The device comprises three parts of the conic filter, the aqueduct and a measuring device. The method is feasible, is easy and simplein operation, and can be used for accurately determining the amount of the leakage liquid; and the obtained sample is high in reliability.

Description

technical field [0001] The technology of the present invention belongs to the technical field of agricultural environmental tests, and relates to a method for collecting and measuring seepage of a large undisturbed soil column in a paddy field, and also relates to a device for collecting seepage in a paddy field, which is suitable for collecting seepage from an undisturbed soil column by hoisting Collect measurements. Background technique [0002] With the excessive application of fertilizers in paddy fields, the pollution of paddy soil and groundwater has become increasingly prominent, and the study of pollutant migration and transformation has attracted more and more attention. Paddy field seepage is an important part of paddy field water consumption, and large soil columns (bottom area ≥ 2m 2 ) is an important means of simulating water migration and material flow in paddy fields, and the measurement of the amount and composition of large-scale soil column seepage is an e...

AI Technical Summary

Problems solved by technology

And for large soil columns (≥2m 2 ) to measure the complete collection of seepage in the crop growth period or annual time unit, the collection area is large, not only requires a large collection of seepage facilities, but also the placement of large soil columns in the early stage and the measurement and drainage of seepage in the later period are time-consuming and labor-intensive In addition, the undisturbed soil column is isolated from its underlying soil surface, and the interface moisture exchange is different from the actual situation in the field, which limits the simulation effect of large undisturbed soil columns

② Small leakage liquid collection device, which can realize the collection of leakage liquid in a small area, but currently the collection device used to store the leakage liquid is buried underground, which is limited by the size of the tank and the amount of leakage liquid in the tank It is difficult to judge the profit and loss. In addition, negative pressure is often used to extract the seepage, so that the soil water flow field above the seepage collection device is easily deformed, thereby reducing the accuracy of the estimation of the seepage.

In addition, most of the existing leakage water collection devices use PVC materials, and the collection and installation of large undisturbed soil columns are often carried out by hoisting methods. Due to factors such as uneven pressure on the underlying surface of the soil column during installation, the collection device is easily deformed , The interface is cracked, which increases the difficulty of placing the soil column

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