CN218444693U

CN218444693U - Soil breathing gas collection system under wet and dry alternative condition

Info

Publication number: CN218444693U
Application number: CN202222245995.0U
Authority: CN
Inventors: 刘帅; 彭新华; 高磊; 张中彬; 郭自春
Original assignee: Institute of Soil Science of CAS
Current assignee: Institute of Soil Science of CAS
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2023-02-03
Anticipated expiration: 2032-08-25

Abstract

The utility model discloses a soil breathing gas collection system under wet and dry condition in turn belongs to soil environment research equipment technical field. The device comprises a sealed cabin, a sealing cover, a water injection pipe, a gravity sensor, a display screen and a supporting plate, wherein the sealing cover is arranged at the top of the sealed cabin, and the water injection pipe penetrates through the sealing cover and is provided with a valve; the gravity sensor is arranged at the bottom of the sealed cabin, and the display screen is arranged outside the sealed cabin and is electrically connected with the gravity sensor; the supporting plate is arranged on the gravity sensor and used for placing a soil sample; the bottom of the sealed cabin is also provided with a vent hole, and a detachable sealing plug is arranged in the vent hole. The utility model discloses can be in soil wet-dry alternation experiment real-time supervision soil weight, reduce soil and get the influence that the operation brought such as putting, weighing repeatedly, improve the measurement accuracy of soil water content.

Description

Soil breathing gas collection system under wet and dry alternative condition

Technical Field

The utility model belongs to the technical field of soil environment research equipment, concretely relates to soil breathing gas collection system under wet and dry alternative condition.

Background

Under natural conditions, soil undergoes a periodic alternate dry-wet process, and the influence of the process on soil respiration is always a research hotspot of soil science. A method for simulating a dry-wet alternative process in a laboratory is to add water for wetting and then dry or naturally air-dry the mixture to a set water content. However, in practical operation, the drying process is slow and difficult to control, and the soil sample is often weighed continuously during the drying or air-drying process to avoid over-drying. In addition, when soil respiration is measured, an experimental soil sample is usually placed in a wide-mouth bottle to facilitate subsequent sealed gas collection operation, so that the soil sample needs to be continuously taken out for water content measurement, influence factors of the soil respiration process under the alternate action of dryness and wetness are too many, and sampling cannot be performed in the process of wetting or drying.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved is as follows: to the technical problem, the utility model provides a soil breathing gas collection system under wet alternate condition futilely can be at soil wet alternate test in real-time supervision soil weight futilely, reduces soil and gets the influence that the operation such as putting, weighing brought repeatedly, improves the measurement accuracy of soil water content.

The technical scheme is as follows: a soil breathing gas collecting device under a dry-wet alternating condition comprises a sealed cabin, a sealing cover, a water injection pipe, a gravity sensor, a display screen and a supporting plate, wherein the sealing cover is arranged at the top of the sealed cabin, and the water injection pipe penetrates through the sealing cover and is provided with a valve; the gravity sensor is arranged at the bottom of the sealed cabin, and the display screen is arranged outside the sealed cabin and is electrically connected with the gravity sensor; the supporting plate is arranged on the gravity sensor and used for placing a soil sample; the bottom of the sealed cabin is also provided with a vent hole, and a detachable sealing plug is arranged in the vent hole.

Preferably, a vent valve is further arranged on the sealing cover.

Preferably, a rubber plug is further arranged at the top of the water injection pipe.

Preferably, the collection device further comprises an air pump, and the air pump is connected with the vent hole through a pipeline.

Preferably, the support plate is a perforated plate.

Preferably, the valve is a three-way valve.

Has the advantages that: the device can monitor the soil weight in real time in a soil wetting and drying alternation experiment to represent the change of the soil water content; meanwhile, the collection of soil breathing gas under the dry-wet alternative condition can be realized, and the influence caused by the operations of repeatedly taking and placing soil, weighing and the like can be reduced in a long-time culture experiment.

The soil sample is placed on the supporting plate, the weight can be monitored in real time through the gravity sensor below the supporting plate, and the weight is displayed on a display screen outside the sealed cabin, so that the recording is convenient; the steerable rate of adding water of valve on the water injection pipe of top when opening the breather valve, through the dry and moist speed of aspiration pump control soil, can also reduce the restriction of consuming time length, dry and the difficult control of moist degree in the experiment of traditional soil dry and wet alternation.

Drawings

Fig. 1 is a schematic structural view of the present invention;

the numerical references in the figures represent the following meanings: 1. the air pump comprises a sealed cabin, 2 parts of a sealing cover, 3 parts of a water injection pipe, 4 parts of a gravity sensor, 5 parts of a display screen, 6 parts of a supporting plate, 7 parts of a valve, 8 parts of an air vent, 9 parts of an air vent valve, 10 parts of a rubber plug and 11 parts of an air pump.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

Example 1

As shown in figure 1, the soil breathing gas collecting device under the dry-wet alternating condition comprises a sealed cabin 1, a sealed cover 2, a water injection pipe 3, a gravity sensor 4, a display screen 5, a supporting plate 6, a vent valve 9, a rubber plug 10 and an air extracting pump 11. The sealing cover 2 is arranged at the top of the sealed cabin 1, and the vent valve 9 is arranged on the sealing cover 2. The water injection pipe 3 penetrates through the sealing cover 2 and is provided with a valve 7, and the valve 7 is a three-way valve and can control the water injection rate; the rubber stopper 10 is arranged at the top of the water injection pipe 3. The gravity sensor 4 is arranged at the bottom of the sealed cabin 1, and the display screen 5 is arranged outside the sealed cabin 1 and is electrically connected with the gravity sensor 4. The supporting plate 6 is a porous plate, is arranged on the gravity sensor 4 and is used for placing a soil sample. The bottom of the sealed cabin 1 is also provided with a vent hole 8, and a detachable sealing plug is arranged in the vent hole 8. The air pump 11 is arranged outside the sealed cabin 1 and is connected with the vent hole 8 through a pipeline.

The steps of collecting the soil breathing gas under the dry-wet alternating condition by using the embodiment are as follows:

the airtightness of the instrument is ensured before the experiment, the airtightness of each connecting part including the rubber plug 10, the valve 7, the sealing cover 2, the vent valve 9 and the like is ensured, and the instrument can be used after the inspection is correct.

Placing an in-situ soil sample collected in the field or a laboratory recombined soil sample on a supporting plate 6, recording the initial soil weight, opening a valve 7, dripping water to the lower soil column by using an injector until the water content required by the experiment is reached, and recording the total weight of the soil column. The sealing plug is pulled out after, connects aspiration pump 11 and air vent 8, opens aspiration pump 11 and breather valve 9 again, and gas flow increases soil drying in the accelerating device, and after the numerical value that 5 shows of display screen reached the dry water content that the experiment set up, closed aspiration pump 11, this is a dry wet cycle.

When the breathing gas content of the soil in the dry-wet alternation process needs to be collected, gas collection is started after the previous step is repeated. The three-way valve and vent valve 9 were opened, vented for 30 minutes, and then the vent valve 9 was closed and the rubber stopper 10 was sealed for determination of carbon dioxide concentration. Each time gas is collected, fresh air is added from the rubber stopper 10 by a syringe to maintain the pressure in the device. And (4) repeatedly drawing and pulling, uniformly mixing the gas in the bottle, and then immediately pumping the gas out of the device by using the syringe. And (5) sealing for 6 hours, then performing secondary gas collection, then taking down the rubber plug 10, opening the vent valve 9, and performing the next dry-wet alternate cycle. CO 2 ₂ The concentration was analyzed on a gas chromatograph (Agilent 7890, santa Clara, USA) equipped with a thermal conductivity detector (analytical accuracy ± 0.5%).

Claims

1. A soil breathing gas collecting device under a dry-wet alternating condition is characterized by comprising a sealed cabin (1), a sealing cover (2), a water injection pipe (3), a gravity sensor (4), a display screen (5) and a supporting plate (6), wherein the sealing cover (2) is arranged at the top of the sealed cabin (1), and the water injection pipe (3) penetrates through the sealing cover (2) and is provided with a valve (7); the gravity sensor (4) is arranged at the bottom of the sealed cabin (1), and the display screen (5) is arranged outside the sealed cabin (1) and is electrically connected with the gravity sensor (4); the supporting plate (6) is arranged on the gravity sensor (4) and used for placing a soil sample; the bottom of the sealed cabin (1) is also provided with a vent hole (8), and a detachable sealing plug is arranged in the vent hole (8).

2. The device for collecting soil respiration gas under wet and dry alternating conditions as claimed in claim 1, wherein a vent valve (9) is further provided on the sealing cover (2).

3. A soil breathing gas collection device under dry-wet alternating conditions as claimed in claim 1, wherein a rubber plug (10) is further provided on the top of the water injection pipe (3).

4. The device for collecting soil breathing gas under dry and wet alternating conditions as claimed in claim 1, wherein the device further comprises a suction pump (11), and the suction pump (11) is connected with the vent hole (8) through a pipeline.

5. The device for collecting soil breathing gas under alternating dry and wet conditions as claimed in claim 1, wherein said supporting plate (6) is a porous plate.

6. The device for collecting soil respiratory gas under wet and dry alternating conditions as claimed in claim 1, wherein said valve (7) is a three-way valve.