[Note: In this paper, scientists used the CO2 isotope analyzer from LGR USA to measure the concentration values ​​of δ13C, 12CO2 and 13CO2, and used it with LI-100's LI-8100-103 soil breathing chamber to measure soil 13CO2. Flux, this is a relatively new instrumental application method at home and abroad, which is worth learning. 】
Abiotic CO2uptake from the atmosphere by semiarid desert soil and its partitioning into soil phases
Jiabin Liu1, Keyu Fa1, Yuqing Zhang1, Bin Wu1, Shugao Qin1, and Xin Jia1
1Yanchi Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing, China
Abstract: Deserts can exhibit strong CO2 flux decline characteristics, which is significant carbon deposition. However, this assumption is strongly challenged because of the inability to determine the stability of flux measurements and accurate carbon fixation sites. In this study, we added 13CO2 to natural (unsterilized) soil in the Mu Us Desert in northern China and quantified the ratio of 13CO2 added to the solid phase soil and gas phase. The results show that the average rate of absorption of 13CO2 by natural desert soil is 0.28 gm-2d-1. In the absorbed 13CO2, 0.0007% is in the gas phase, however, 20.0% of the absorbed 13CO2 is not detected. These results show that undisturbed deserts can absorb CO2 from the atmosphere, and most of the fixed carbon is stored in the soil solid phase.
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