A device and experimental method for simulating greenhouse gas emissions from drainage ditches under intermittent hydrodynamic conditions

Abstract

The invention discloses a device and an experimental method for simulating the emission of greenhouse gases from drainage ditches under intermittent hydrodynamic conditions. The water supply system is located on the side of the paddy field system and connected by water pipes. The rectangular plastic pots in the paddy field system are connected to the ditch tank on the side where the field ridge is provided. , the gas collection device and the water-sediment collection system are equidistantly placed in the ditch tank, the tail of the tank is provided with a tailgate, and the tailgate is connected with a drainage tank; the present invention can realize intermittent hydrodynamic controllable conditions, drainage ditch The common sampling of greenhouse gases, water and sediment at different spatial depths in the paddy field has important theoretical and practical significance for accurately measuring the emission flux and concentration distribution of greenhouse gases in paddy field drainage ditches, and revealing their influencing mechanisms and controlling 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 ...

AI Technical Summary

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

Images