CN211876975U - A soil freezing depth measuring device - Google Patents

Abstract

The utility model belongs to the field of winter ecology research, and relates to a soil freezing depth measuring device, comprising a PVC sealing plug 1, a methylene blue solution 2, a transparent PVC pipe 4 and a scale line 3 arranged on the outer wall of the transparent PVC pipe 4, the PVC sealing The plug 1 plays a sealing role, and the concentration of the methylene blue solution 2 is 2%; the length of the transparent PVC pipe 4 can be selected according to the measurement depth as required, and when the measurement depth is within the range of 1-2m, a rigid The transparent PVC pipe 4 is directly measured, and when the measurement depth is greater than 2m, the soft transparent PCV pipe 4 is used to penetrate into the built-in hole punched by the rigid PVC pipe, so that it is convenient to take out and measure. The device of the utility model has low cost, good measurement and freezing effect, accurate data, convenient operation and storage, and is suitable for grassland field experiments.

Description

A soil freezing depth measuring device

technical field

The utility model relates to the field of winter ecology research, in particular to a soil freezing depth measuring device.

Background technique

Soil is the main living environment for terrestrial plants. The soil contains more or less moisture. When the soil temperature drops below 0°C in winter, the moisture in the soil will condense into ice and freeze together with the soil particles, thus forming permafrost. Just like the fact that no matter how cold the rivers and lakes are in winter, it is difficult to freeze as a whole, the soil also has a huge heat capacity. Although the upper layer is frozen, after reaching a certain soil layer, its temperature will no longer drop, and it will remain at a basically constant level all year round, and the temperature of this soil layer will not change with the change of external environmental conditions. This layer is called constant temperature layer. The freezing depth of soil depends on the intensity of low temperature below 0°C on the surface, soil moisture status and soil texture. Plants and animals mostly carry out life activities at the soil depth of 1-2m, so the determination of the freezing depth of the topsoil is particularly important.

Soil freezing and thawing will aggravate the degree of soil salinization, and freezing and thawing will promote greenhouse gas emissions. Therefore, soil freezing and thawing in winter has attracted more and more researchers' attention. Grasslands are considered the largest managed ecosystem on Earth and are affected by a combination of frequent human activities and ongoing global climate change. Climate change affects the global ecosystem in various ways, changing the physiology, phenology, reproduction, survival and distribution of many species, and even causing species extinction. Accumulating research evidence shows that climate change is one of the main factors affecting biodiversity, posing huge challenges to biodiversity conservation. Therefore, exploring the impact of climate change on biodiversity can provide important reference and basis for regional and even global biodiversity conservation in time. The existing method for measuring the thickness of the seasonally frozen soil layer is based on "in the seasonally frozen soil area, the resistivity of the upper layer of soil is much greater than that of the lower layer of soil, and the depth of one of the two electrodes buried in the ground increases. Cause the potential difference between two points on the surface to drop, because the grounding resistance drops sharply after the current pole penetrates the upper frozen soil, resulting in a sharp reduction in the rate of change of the surface potential difference" principle, although it solves the problem of seasonal frozen soil thickness measurement, but there is a cost High, complex structure, limited power supply conditions and other unfavorable factors.

In order to avoid the above unfavorable factors, it is convenient to study the seasonal changes of soil freezing depth or the difference of freezing depth under different treatments, and provide some technical support, so a reasonable soil freezing depth measurement device is designed in the device of the present utility model, so as to carry out Research on grassland ecology under climate change to predict the impact of future climate change on grassland.

Utility model content

In order to overcome a series of defects existing in the prior art, the purpose of the present invention is to provide a soil freezing depth measuring device to solve the problems raised in the above background art.

A soil freezing depth measuring device of the present invention comprises a PVC sealing plug 1, a methylene blue solution 2, a transparent PVC pipe 4 and a scale line 3 arranged on the outer wall of the transparent PVC pipe 4. The sealing plug 1 plays a sealing role, and the The concentration of methylene blue solution 2 is 2%.

Preferably, the specification of the PVC sealing plug 1 is GB10002.2, 1.0MPA, 20mm, one end of which is inserted into the soil as the bottom, and the other end is exposed outside the soil.

Preferably, the methylene blue solution 2 is put into a transparent PVC tube when in use. Anhydrous methylene blue is a powder with golden red light or bronze light, soluble in water, alcohol, chloroform, and insoluble in ether, and its solution is blue , Dehydration after freezing shows anhydrous methylene blue color pink or bronze, color can indicate the depth of soil freezing, play a role in indicating color.

Preferably, the scale line 3 is on the outer wall of the transparent PVC pipe 4, and after the methylene blue solution 2 develops color, the soil freezing depth value is indicated by reading the scale.

Preferably, the length of the transparent PVC pipe 4 can be selected according to the required measurement depth. When the measurement depth is within the range of 1-2m, the rigid transparent PVC pipe 4 can be used for direct measurement. When the measurement depth is greater than 2m, Then, a soft transparent PVC pipe 4 is used to penetrate into the interior of the perforated hard PVC pipe, so that it is convenient to take out and measure.

The soil freezing depth measuring device of the present invention has the following beneficial effects:

The utility model can conveniently measure the freezing depth of the grassland soil, can be recycled and stored when not in use, and does not occupy space. The cost is low, the measurement effect is good, it is suitable for ecological researchers or climate change personnel, and it plays a key technical support for simulating climate change to study the soil freezing of grassland ecology in winter.

Description of drawings

Fig. 1 is the overall schematic diagram of the soil freezing depth measuring device of the present invention;

Fig. 2 is the working schematic diagram of the soil freezing depth measuring device of the present invention;

The reference numbers in the figure are:

1-PVC sealing plug 1,2-Methylene blue solution, 3-Scale, 4-Transparent PVC pipe

Detailed ways

In order to make the implementation purpose, technical solutions and advantages of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings in the embodiments of the present utility model. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, embodiments of the present invention. The embodiments and orientation words described below with reference to the accompanying drawings are all exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation to the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention. The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

In a broad embodiment of the present invention, a soil freezing depth measuring device mainly includes: a transparent PVC pipe 4 with a diameter of 2 mm, the outer wall of which is provided with a precise scale 3; two PVC sealing plugs 1 for sealing, They are located at both ends of the transparent PVC pipe, the specifications are GB10002.2, 1.0MPA, 20mm; the methylene blue solution 2 with a concentration of 2% contained in the transparent PVC pipe.

The specification of the PVC sealing plug 1 is GB10002.2, 1.0MPA, 20mm, one end of which is plunged into the soil as the bottom, and the other end is exposed outside the soil.

The methylene blue solution 2 is put into the transparent PVC tube 4 when in use. Anhydrous methylene blue is a powder with golden red flashing gold or bronze light, soluble in water, alcohol, chloroform, and insoluble in ether, and its solution is blue, Dehydration after freezing shows anhydrous methylene blue color pink or bronze, which can indicate the depth of soil freezing and play a role in indicating color development.

The scale line 3 is on the outer wall of the transparent PVC pipe 4, and after color development by the methylene blue solution 2, the soil freezing depth value is indicated by reading the scale.

The length of the transparent PVC pipe 4 can be selected according to the required measurement depth. When the measurement depth is within the range of 1-2m, the rigid transparent PVC pipe 4 can be used for direct measurement. When the measurement depth is greater than 2m, the soft The transparent PVC pipe 4 is built deep into the perforated hard PVC pipe, so as to facilitate the removal of the assay.

Taking the Hulunbuir grassland in Inner Mongolia as an example, the freezing at 1 m underground in winter begins to melt after May 1 every year, and the surface layer is completely melted in early June. The soil freezing depth measuring device of the present utility model can be used, and the measuring method is as follows:

(1) Drill holes with an earth drill with a diameter suitable for the transparent PVC pipe, put the methylene blue color developing solution with a concentration of 2% into the transparent PVC pipe, seal it with a sealing plug, and apply glue to seal;

(2) Bury the soil before the snowfall and freeze in October, so as to monitor the soil freezing depth in winter. The burial method can be divided into two types according to the difference of the measured surface depth:

If the soil freezing depth of 1-2m on the surface is measured, the hard transparent PVC pipe is directly used for measurement;

If the soil freezing depth greater than 2m is determined, the rigid PVC pipe needs to be penetrated into the soil first, and then the transparent PVC hose filled with methylene blue solution 2 is put into it;

(3) Measured according to color development. Through conduction after soil freezing in winter, the methylene blue solution is frozen, and the frozen solution changes from blue to pink. Through the color change, the value is read on the scale of the transparent tube to measure the soil freezing depth.

Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and These modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. The utility model provides a soil freeze degree of depth measuring device which characterized in that seals stopper (1), methylene blue solution (2), transparent PVC pipe (4) and sets up in scale mark (3) of transparent PVC pipe (4) outer wall including PVC, seal stopper (1) and play sealed effect, the concentration of methylene blue solution (2) is 2%.

2. A soil freeze depth measuring device according to claim 1, wherein: the specification of the PVC sealing plug (1) is GB10002.2, 1.0MPA and 20mm, one end of the PVC sealing plug is inserted into soil to be used as the bottom, and the other end of the PVC sealing plug is exposed out of the soil.

3. A soil freeze depth measuring device according to claim 1, wherein: the scale marks (3) are arranged on the outer wall of the transparent PVC pipe (4), and the numerical value of the freezing depth of the soil is indicated by reading the scale marks after the methylene blue solution (2) is developed.

4. A soil freeze depth measuring device according to claim 1, wherein: the length of the transparent PVC pipe (4) can be selected according to the required measuring depth, when the measuring depth is within the range of 1-2m, the hard transparent PVC pipe (4) can be used for direct measurement, and when the measuring depth is more than 2m, the soft transparent PVC pipe (4) is used for penetrating into the built-in hole punched by the hard PVC pipe, so that the hard transparent PVC pipe can be taken out for measurement conveniently.

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