Device for sampling nitrous oxide in paddy field soil

Abstract

The invention discloses a device for sampling nitrous oxide in paddy field soil. A base comprises a foundation support and a zig-zag groove, a tank body is a cuboid and is jogged with the zig-zag groove of the base, a case fan is built on the inner surface at the top of the tank body, and a power line of the case fan is connected with a storage battery. An iron net is fixed on the inner surface at the top of the tank body to cover the case fan, a silicone rubber tube penetrates through the top surface of the tank body, part of the silicone rubber tube is inserted into the tank body, and part of the silicone rubber tube is remained outside the tank body. An outlet of a three-way valve is connected to the tail end of the silicone rubber tube outside the tank body, and other two outlets of the three-way valve are respectively connected with a 50-ml injector and a gas collecting cylinder. A probe line of a hygrothermograph penetrates through the top surface of the tank body, a probe is hung in the middle of the tank body, and a digital display part of the hygrothermograph is horizontally arranged at the top of the tank body. The device can avoid sharp increase of the air temperature caused by solar radiation in the sampling process, the temperature in the device is kept to be stable, and the device is moderate in volume, light in weight and suitable for filed operation.

Description

technical field [0001] The invention relates to a soil gas sampling device, in particular to a paddy field soil nitrous oxide sampling device. It is suitable for scientific research and environmental testing departments to take samples when measuring the nitrous oxide gas emitted from paddy field soil to the outside world. Background technique [0002] Greenhouse gases are gases in the Earth's atmosphere that cause the greenhouse effect. Among all emission sources, soil is an important source of greenhouse gas emissions. Nitrous oxide is an important greenhouse gas emitted by soil. Nitrous oxide has an increasing impact on global climate change. Its warming effect is 298 times that of CO2. It not only stays in the atmosphere for a long time (the average lifespan is about 150 years), and destroy the ozone layer of the atmosphere. Due to the increase of human activities, the concentration of N2O in the atmosphere is increasing at a rate of 0.2%-0.3%. At this rate, the conce...

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Problems solved by technology

The production of soil nitrous oxide is mainly closely related to the activities of soil microorganisms. The change of soil temperature can significantly change the production of soil nitrous oxide. In the past, the collection device made of plexiglass and stainless steel sheet could not effectively control the gas collection. The temperature inside the device causes the temperature inside the device to rise too fast. In this case, the amount of nitrous oxide gas collected cannot be equal to the nitrous oxide gas produced by the soil under natural conditions.

And use plexiglass, the production cost is relatively high, and it is easy to be damaged in the process of utilization

The gas collection box is made of stainless steel sheet, surrounded by a layer of 5mm thick heat insulating material and a layer of aluminum foil to limit the change of air temperature in the sampling box. The exterior of the device is easily damaged

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