An adjustable depth soil carbon dioxide collection device and its application method

Abstract

The invention relates to an adjustable-depth collecting device for carbon dioxide in soil and a use method of the adjustable-depth collecting device. The adjustable-depth collecting device comprises a gas storage device, a coupling device, a telescopic device and a gas chamber device which are arranged in sequence from top to bottom, wherein the gas storage device comprises a gas chamber cover; the top end of the gas chamber cover is provided with a fixed gas collecting pipe with fixed length; the upper end of the fixed gas collecting pipe is provided with a telescopic pipe with telescopic length; the telescopic pipe is fixedly locked on the fixed gas collecting pipe by a locking sleeve; two connecting pipes are arranged on the telescopic pipe and are provided with spherical sealing valves for controlling opening and closing; and the lower ends of the two connecting pipes are connected with the telescopic pipe and the upper ends of the two connecting pipes are connected with the gas storage bottle. The use method comprises the following steps: (1) vacuumizing on a site; (2) checking leakage; (3) installing and adjusting the height, and if the reading change difference of P1 is less 5%, carrying out step (4); (4) collecting the CO2 gas; and (5) converting sampling volume Vn under the standard state.

Description

technical field [0001] The invention relates to a depth-adjustable soil carbon dioxide collection device and a method for using the device, belonging to the technical field of gas sample collection. Background technique [0002] Soil CO 2 The release of carbon dioxide is an important part of the carbon cycle of terrestrial ecosystems. The global soil is a huge carbon pool, and its carbon storage is about 1500Pg, which is twice and three times that of terrestrial vegetation and atmosphere, respectively. It is estimated that the global soil releases 68-77Pg / a of carbon into the atmosphere every year, which is more than 10 times the amount of carbon emitted by fossil fuels. Soil CO 2 releases of even small changes would equal or exceed the amount of CO entering the atmosphere due to land-use change and / or burning of fossil fuels 2 annual input. [0003] Global climate change, especially the climate warming caused by greenhouse gases, has attracted worldwide attention. It ...

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Problems solved by technology

[0007] 2. Different soil quality and soil depth directly affect soil CO 2 The amount of gas released, which affects soil CO 2 Gas release rate and flux;

[0008] 3. In the patented technical solution, the gas cylinder is evacuated in the laboratory and the reading P1 of the pressure gauge at this time is recorded. However, in the actual use process, the reading P1 obtained in the laboratory is different from the data in the field operation. There is a certain error, which is not only limited by the altitude and temperature in the field, but also may be due to leakage factors such as intermediate transportation vibration, so the reading P1 obtained in the laboratory is inaccurate

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