Device for simulating emission of greenhouse gas of drainage channel under intermittent hydrodynamic condition and experimental method thereof

Abstract

The invention discloses a device for simulating emission of greenhouse gas of a drainage channel under an intermittent hydrodynamic condition and an experimental method thereof. The device comprises arice field system, a channel water tank, a water-bottom mud collecting system, a gas collecting system, a water supply system, a tail door and a water discharging groove; the water supply system is located on the side surface of the rice field system and is connected through a water channel pipeline; a rectangular plastic basin bowl in the rice field system is connected with the channel water tank at one side of a field ridge; the rice field system is used for realizing irrigation through the water supply system; water discharge to the channel water tank is realized through the field ridge; the gas collecting system and the water-bottom mud collecting system are arranged in the channel water tank at equal distances; the tail door is arranged at the tail part of the water tank, and the back part of the tail door is connected with a drainage groove; the greenhouse gases with different space depths in the drainage channel and the water and the bottom mud are sampled together in the controllable intermittent hydrodynamic condition, and the device has an important theory and practical significance for accurately measuring the emission flux and concentration distribution of greenhouse gas in the drainage channel of the rice field, disclosing the influence mechanism and the control factors.

Description

technical field [0001] The invention relates to a device and an experimental method for simulating greenhouse gas emission from drainage ditches under intermittent hydrodynamic conditions, and belongs to the field of environmental protection systems. Background technique [0002] Drainage ditches around rice fields are an important part of agricultural engineering construction, which play an important role in timely waterlogging and drainage. At the same time, they also transport a large amount of pollutants from rice fields to downstream rivers, lakes and other water bodies, further aggravating agricultural non-point source pollution. , resulting in severe eutrophication of the water body, so the research on the biological interception and removal of pollutants in drainage ditches has attracted the attention of many scholars, such as reducing the discharge into the downstream water body through the action of sediment adsorption, microbial degradation and plant absorption in ...

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Problems solved by technology

[0003] Paddy field drainage ditches are not only affected by the intermittent drainage of surrounding paddy fields, but also under the background of excessive chemical fertilizer application, a large amount of rice field pollutants such as nitrogen and phosphorus enter the drainage ditches along with the paddy field recede, contributing to greenhouse gases, especially CH 4 and N 2 The reactions required for the generation of O provide sufficient substrates and favorable environmental conditions, and are also an important source of greenhouse gas emissions; Research is still lacking

The emission of greenhouse gases in drainage ditches is affected by environmental conditions such as hydrodynamics, meteorology, and hydrology. The commonly used monitoring methods for greenhouse gases in wetland and paddy field soils are no longer suitable for drainage ditches, especially under the influence of intermittent hydrodynamic conditions, and drainage Field monitoring of greenhouse gases in ditches has great uncertainty, and in-situ observations are difficult to accurately capture and clarify the impact mechanism and key control factors of greenhouse gas emissions, but this is of great significance for slowing down greenhouse gas emissions in drainage ditches; therefore, It is urgent to propose an experimental device and method for simulating greenhouse gas emissions from drainage ditches under intermittent hydrodynamic conditions, so as to realize the joint measurement of greenhouse gases in drainage ditches and the types and contents of main pollutants in water and sediment under hydrodynamic controllable conditions. Indoor experimental device and method

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