Device and method for quickly measuring carbon dioxide flux of soil

Abstract

The invention discloses a device and a method for quickly measuring the carbon dioxide flux of soil. The device comprises a glass bottle, a bottle cover with gas collection ports, gas guide pipes and a CO2 analyzer, wherein the bottle cover is screwed on the glass bottle and is connected to the CO2 analyzer through the gas collection ports and the gas guide pipes; drilled holes are formed in the bottle cover; threaded screws are inserted into the drilled holes, and gaskets are used for sealing contact surfaces of the threaded screws and the bottle cover; a circular protruded part is arranged on the part, which is exposed out of the bottle cover, above each threaded screw; inwards sunken grooves are formed in the protruded parts. According to the device and the method which are disclosed by the invention, a dynamic circulating process in a closed pipeline is formed, so that the phenomenon that gas cannot flow is avoided, and the accuracy of a measured result is improved. The measurement time is short, and the shortest measurement time can be set to be within 1-3 minutes; the next sample can be immediately measured as soon as a soil sample is measured, so that the quick measurement of batches of soil samples can be realized.

Description

Technical field [0001] The invention is the field of ecological and meteorological environmental regulation, and it involves a device and method that quickly determines the flux of the soil carbon dioxide. Background technique [0002] Soil CO 2 The flux is an important process in the carbon cycle. 2 The estimation value of the carbon released to the atmosphere is about 50 ~ 120 pg (1 pg = 1 × 10 15 g), the value is second only to the estimated values of the global general primary productivity (GPP).At present, people have relatively many research on the "ground" process in the ecosystem, and the research on the "underground" process is not thorough, and soil respiration has an important impact on ecosystem carbon balance. 2 The process and its influence factor are extremely critical to understanding the land carbon cycle. [0003] Due to soil CO 2 The important role of flux in the carbon cycle, domestic and foreign scientists have already on soil CO 2 Some research methods, proc...

AI Technical Summary

Problems solved by technology

In the past, the observation methods and equipment of soil CO2 flux were mainly aimed at the observation of field soil CO2 emissions. The observation instruments mainly include static box-gas chromatography, portable soil respiration However, there are some problems in these research methods: when the observation site is in the field, the observed soil CO2 flux includes root respiration and soil heterotrophic respiration, and cannot focus on soil CO2The influence factors and mechanism of emissions are studied; when the soil samples are collected back to the laboratory to analyze the CO2 flux, if the design of the gas extraction port is unreasonable, the pressure in the closed container will be too high, and then Affect the gas flux measurement effect, the reliability of the experimental results is also greatly reduced, and the expected experimental purpose cannot be achieved

Therefore, it is necessary to use a new method to solve the problem of inaccurate measurement of soil CO2 flux, and provide the necessary experimental equipment for the research of farmland soil carbon cycle.

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