Freeze prevention method for CO2 absorption liquid for in-situ winter soil respiration sample plot monitoring

Abstract

The invention relates to in-situ monitoring of soil respiration amount and in particular relates to a freeze prevention method for CO2 absorption liquid for in-situ winter soil respiration sample plot monitoring. Freeze prevention liquid is added into the absorption liquid for the in-situ soil respiration amount monitoring; the CO2 absorption liquid for the in-situ winter soil respiration sample plot monitoring can absorb CO2 in a field in a northeast place at the temperature below 0 DEG C. According to the freeze prevention method, anhydrous ethyl alcohol which is low in cost, low in ice point and readily available is used as a freeze prevention agent; the ice point of a mixed solution can be reduced only by adding a certain proportion of the anhydrous ethyl alcohol into the original absorption alkaline liquid, and the CO2 absorption liquid for the in-situ winter soil respiration monitoring can be prevented from being frozen.

Description

technical field [0001] The invention relates to the in-situ monitoring of soil respiration, in particular to a CO 2 Antifreeze method of absorbing liquid. Background technique [0002] Soils are the largest carbon pool in terrestrial ecosystems and play a role in regulating the global carbon cycle with atmospheric CO 2 The important function of source and sink, its small changes will affect the atmospheric CO 2 concentration, and has been paid more and more attention. Soil respiration is the exchange of CO between the soil and the atmosphere 2 The process is the result of soil carbon assimilation and dissimilation balance. Studies have shown that CO released by soil respiration in terrestrial ecosystems 2 The amount is about 50-76PgC per year, which is about 1 / 10 of the atmospheric carbon pool, which is the cause of atmospheric CO 2 One of the main causes of global warming due to the increase in concentration. As a key biological process in the carbon cycle of the ear...

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Problems solved by technology

However, this method also has certain limitations, mainly because the lye used in this method is made of water as a solvent. When the temperature is lower than 0°C, the solution will freeze and cannot absorb the CO released by the soil. 2 gas, which affects the normal in-situ measurement of soil respiration in winter, which limits the application of this method in the study of soil respiration flux under winter low temperature conditions in northern my country