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Volume 40 Issue 4
Aug.  2021
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WU Xia, PAN Moucheng, YIN Jianjun, WANG Zhijun, ZHU Xiaoyan, YANG Hui, CAO Jianhua. Seasonal variation characteristics of soil respiration release and its isotopic composition in typical karst area, Guilin[J]. CARSOLOGICA SINICA, 2021, 40(4): 592-599.
Citation: WU Xia, PAN Moucheng, YIN Jianjun, WANG Zhijun, ZHU Xiaoyan, YANG Hui, CAO Jianhua. Seasonal variation characteristics of soil respiration release and its isotopic composition in typical karst area, Guilin[J]. CARSOLOGICA SINICA, 2021, 40(4): 592-599.

Seasonal variation characteristics of soil respiration release and its isotopic composition in typical karst area, Guilin

  • Publish Date: 2021-08-25
  • It is of great value to understand the variation amplitude and temporal dynamics of soil respiration on a global scale so as to accurately predict the change of soil respiration under future climate scenarios, and to evaluate the carbon neutrality goals and technical approaches. In this study,the static chamber/gas chromatography were used to establish soil CO2 flux and δ13C CO2seasonal variation in the typical karst area of Maocun village.This study mainly aims to reveal the influence mechanism of soil CO2 and δ13C CO2 on environmental factors under field conditions Guilin.The influence of environmental factors on soil CO2 flux and δ13C CO2 were determined by monitoring atmospheric temperature, pressure, soil temperature and other environmental parameters. The monitoring results showed that the seasonal variation of soil CO2 flux in the study area was obviously high in summer and low in winter, and the soil CO2 flux at 10 cm in summer was significantly higher than that at 0 cm in the surface layer, while there was no significant difference in winter. Moreover, the soil Q10 value increased from 1.90 to 2.39 when the depth varies from 0 cm to 10 cm, indicating that the soil respiration mainly came from this depth range. Soil temperature is the main environmental factor affecting the change of soil CO2 flux, and the two show an obvious positive correlation. Copmared with 10 cm,the CO2 at 0 cm surface layer was also affected by the dilution of diffusion. Because the diffusion coefficient of 12CO2 is greater than 13CO2, the soil δ13C CO2 is lighter than the atmospheric δ13C during the monitoring period, which has obvious seasonal characteristics of being lighter in summer and heavier in winter, and the δ13C CO2 at 10 cm is significantly lighter than that at 0 cm.

     

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