Experimental device for measuring stratified flux of greenhouse gases in rice field drainage ditch, and method thereof

Abstract

The invention discloses an experimental device for measuring the stratified flux of greenhouse gases in a rice field drainage ditch, and a method thereof. The experimental device comprises a cylindrical top cover box, a cylindrical box body, a gas synchronous sampling device, an automatic water inlet and outlet device, and a temperature sensor probe, a pollutant uniform spraying device, a pressureequalizing pipe and a micro-barometer, which sequentially pass through four mounting holes in the top of the cylindrical top cover box; the cylindrical box body is connected below the cylindrical topcover box, the gas synchronous sampling device is located on a side face of the cylindrical box body, and the automatic water inlet and outlet device is respectively connected with the top and the bottom of the cylindrical box body. A fixed pulley is arranged on the pollutant uniform spraying device, and during the paying off of the fixed pulley, a uniform pollutant spraying bottle can slide along a wire rope I and uniformly spray pollutants into the cylindrical box body at the same time. The invention further discloses an experimental method of the above device. By adopting the experimentaldevice disclosed by the invention, the quantitative input of pollutants such as a sulfur fertilizer and the like, and the accurate measurement of the stratified flux of the greenhouse gases in the drainage ditch under the control of different hydrodynamic conditions are achieved, the operation is simple and convenient, and the cost is low.

Description

technical field [0001] The invention relates to an experimental device and a method for measuring the layered flux of greenhouse gases in paddy field drainage ditches and belongs to the field of environmental protection systems. Background technique [0002] Drainage ditches are important ecological corridors connecting rice fields, rivers, lakes and other water bodies. They not only collect and transport a large amount of runoff, but also carry and transport a large amount of nutrients such as carbon, nitrogen and sulfur. This special geographical location makes the drainage ditch a special ecological system with the nature of the transition zone, which has the dual characteristics of the rice field ecosystem and the wetland ecosystem. The special ecosystem of drainage ditches can not only provide greenhouse gases, whether it is methane CH 4 or N 2 The production of O provides sufficient reaction substrates and the environmental conditions required to produce these greenh...

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Problems solved by technology

Greenhouse gas emissions in drainage ditches are affected by the input of nutrients such as paddy field dewatering and sulfur fertilizers. Traditional monitoring and sampling devices for greenhouse gas emission fluxes in wetland and paddy field soils have been difficult to apply. In order to further study greenhouse gas emissions in drainage ditches At the same time, due to the high degree of uncertainty in the field environment, it is difficult to quantitatively study the characteristics of greenhouse gas emissions under different conditions, so that it is impossible to reveal the impact mechanism of greenhouse gas emissions; in addition, previous monitoring and sampling studies of greenhouse gases Whether in the field or indoors, the distribution characteristics of greenhouse gases at different spatial depths are not considered, which is of great significance for the effective reduction of greenhouse gases in ditches; Experimental device and method for layered flux of greenhouse gases in drainage ditches under controlled conditions

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