Soil gas collecting device and gas collecting method

A collection device and soil gas technology, applied in the field of agricultural engineering, can solve problems such as inaccurate measurement of soil gas content, limited soil gas collection depth, and difficult collection of soil gas, so as to solve the problem of inconvenient gas collection and precise control of fixed-point collection , The collection process is simple and fast

Inactive Publication Date: 2016-07-20
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a novel soil gas collection device and gas collection method in view of the defects of tedious gas collection steps, bulky collection equipment structure

Method used

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  • Soil gas collecting device and gas collecting method
  • Soil gas collecting device and gas collecting method
  • Soil gas collecting device and gas collecting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] see figure 1 and figure 2 , the soil gas collection device in the illustration includes a gas collection bottle 1, a telescopic tube 2, a three-way valve 3, an electric air pump 4 and a vacuum tube 5, wherein the gas collection bottle 1 is buried in the soil as a whole, and its inner cavity passes through the telescopic tube 2 It is connected to the three-way valve 3, the electric air pump 4 and the vacuum tube 5 provided outside the soil in sequence.

[0031] Specifically, the bottle body of the gas collecting bottle 1 is drilled with some air-breathing small holes 12, the distance between the air-breathing small holes 12 is 3cm, and the aperture of the air-breathing small holes is 20mm. Micron-level check valve 11, the check valve 11 is provided with pores with a diameter of about 10um, which allows the gas in the soil to pass through and prevents soil particles from entering the gas collecting bottle.

[0032] The bottle opening of the gas collecting bottle 1 is p...

Embodiment 2

[0036] see figure 2 The difference between this embodiment and Embodiment 1 is that the inner cavity of the gas collecting bottle 1 of this embodiment is connected to the handheld gas measuring instrument 6 outside the soil through a pipeline. Equally, be drilled with air-breathing small hole 12 in the lower part of gas-collecting bottle, the spacing between the air-breathing small hole 12 is 3cm, and the aperture of air-breathing small hole 12 is 20mm, and micron is embedded in air-breathing small hole 12. The non-return valve 11 of the stage, the non-return valve 11 is provided with the hole that aperture is about 10um, allows soil gas to pass through, and prevents soil particles from entering the gas collecting bottle. The length of the shrink tube 2 can be adjusted, and the adjustment range is 20cm-100cm in the soil cultivation layer; a three-way valve 3 is connected to the pipeline between the hand-held gas measuring instrument 6 and the gas collection bottle 1, and the ...

Embodiment 1

[0038] Embodiment 1 and embodiment 2 when specifically carrying out the soil gas collection test, at first the gas collecting cylinder 1 is embedded in the predetermined depth of the soil layer to be tested, and the three-way valve 3 is left above the ground by adjusting the telescopic pipeline; the gas collecting The depth and the position of the bottle 1 can be adjusted according to the actual conditions of the soil.

[0039]Secondly, by adjusting the control valve on the three-way valve 3, the connection between the air inlet and the exhaust port of the three-way valve 3 is controlled to discharge the interfering gas in the gas collecting bottle 1 and the pipeline. The air in the previous gas cylinder and pipeline has a different content from the air in the soil. If it is collected together, it will have an unpredictable impact on the test results.

[0040] Finally, adjust the control valve on the three-way valve 3 to control the connection between the air inlet and the air...

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Abstract

The invention discloses a soil gas collecting device and a gas collecting method.The device comprises a gas collecting bottle.The gas collecting bottle is buried in soil, multiple small gas absorption holes are formed in a bottle body, and micron-order check valves are embedded into the small gas absorption holes.An inner cavity of the gas collecting bottle is connected to a gas exhaust part and a gas storage part outside the soil through pipelines, a three-way valve is connected to the pipeline between the gas exhaust part and the gas collecting bottle, a gas inlet and a gas outlet of the three-way valve are connected with the gas exhaust part and the gas collecting bottle respectively, and an exhaust port of the three-way valve is communicated with the atmosphere.Gas samples in the soil are collected through a closed chamber method, and soil layer gases at different depths can be collected and measured.The whole device is simple and convenient to carry, the problems that gases on a soil plough layer are inconvenient to collect, and the content of the soil gases is inaccurately measured are solved, the convenient soil gas collecting device is provided, and a solid foundation is laid for future soil gas measurement.

Description

technical field [0001] The invention belongs to the technical field of agricultural engineering, and in particular relates to a soil gas collection device and a gas collection method, which are used to accurately measure the gas concentration in the soil. Background technique [0002] Plants require a large amount of oxygen from the very beginning of germination. When oxygen is insufficient, the growth of plants is inhibited, and anaerobic process occurs in the soil at the same time, thereby producing harmful substances (reduced compounds) to plants and beneficial microorganisms. CO 2 The change of concentration will directly affect the photosynthesis and respiration of plants, and change the water use efficiency of plants. The study found that plants in the current atmospheric CO 2 Concentrations are basically insufficient for photosynthesis, so CO 2 The increase in concentration will increase the primary productivity, called CO 2 "fertilization effect". Soil CO 2 Co...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N1/22
CPCG01N1/2294G01N30/02
Inventor 胡德勇沈维姚帮松
Owner HUNAN AGRICULTURAL UNIV
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