Soil gas collector for alternately frequent low temperature, drought, wet, freezing and thawing soil

Abstract

The invention discloses a soil gas collector for alternately frequent low temperature, drought, wet, freezing and thawing soil. The soil gas collector consists of samplers, a control cabinet and a microclimate acquisition instrument; a micro gas inlet is formed in the tube wall of the lower end of a sampling protection tube; an antifreeze heating tape coats the outer wall of the sampling protection tube; a plastic upper cover is arranged at the top end of the sampling protection tube; a plastic lower plug is arranged at the bottom of the sampling protection tube and is fixed by a screw; a silica tube plug is arranged in the sampling protection tube; a vacuum pump, an inverter power supply and a filter are arranged in the control cabinet; and the microclimate acquisition instrument consists of a wind speed cup, a wind vane, an air temperature and humidity sensor and a ground temperature sensor. By the soil gas collector, the blockage interference with the micro gas inlet caused by soil particles, water and ice can be avoided; the soil greenhouse gas in a certain depth range can be collected; simultaneously outside air is prevented from entering the gas collection tube; the amount of the collected gas is increased by sucking the gas by utilizing mobile gas sucking equipment consisting of a gas pump and the like, so that experimental errors can be further eliminated, and the experimental precision can be improved; and soil gas collectors can be distributed in the soil at different depths according to experimental requirements to collect the soil greenhouse gases in different depth ranges, so that the greenhouse gas concentration in each depth range of a soil profile is monitored periodically. The soil gas collector is simple in structure, convenient to operate, and suitable for observing a plurality of points at the same time.

Description

technical field [0001] The invention relates to the technical field of test instruments and equipment, in particular to a soil gas collector used for low temperature, drought, humidity and frequent freeze-thaw alternation. Background technique [0002] As we all know, it is an indisputable fact that the change of the earth's climate system is mainly characterized by climate warming. Under the background of climate warming, the permafrost in the Qinghai-Tibet Plateau is degraded to varying degrees, which may cause a large amount of soil organic carbon and nitrogen in the permafrost area to be released in the form of greenhouse gases (such as CO 2 and N 2 O, etc.) into the atmosphere, showing a positive feedback effect. Therefore, research on the mechanism and influencing factors of soil greenhouse gases has important practical significance for controlling greenhouse gas emissions and protecting the ecological environment in arid and permafrost regions. During the period whe...

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Problems solved by technology

Because the soil in the active layer of permafrost often undergoes alternating freeze-thaw interactions, when the soil water freezes into ice, it often blocks the air intake holes for gas collection, which brings great obstacles to the application of other porous soil gas collectors in this area.

At present, researchers have used a single stomata to monitor soil gas samples at different depths, but since it only represents soil gas at a certain depth, it is difficult to combine it with soil physical and chemical properties in a specific depth range to analyze the mechanism of greenhouse gas generation and Influencing factors, which bring a lot of error and uncertainty to the test results

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