Study on the Change of Dune CO2 Concentration in Summer at Minqin in Tengger Desert
Received date: 2010-01-01
Revised date: 2010-07-01
Online published: 2010-11-25
We have measured the diurnal changes of dune CO2 concentration under different depth by using the infrared monitoring instruments in Minqin County in 2009, and combined the results with simultaneous temperature data. The results show that the CO2 concentration of -2 m and -4 m always greater than that of -1 m. The diurnal CO2 cumulative concentration from this research can be ranked as fixed dunes > semi-fixed dune > moving dune. The CO2 cumulative concentration is greater at daytime than at nighttime. For fixed, semi-fixed and moving sand dunes, the CO2 concentration has a changing law of“low to high and then to low”from the morning to the next morning, which is basically the same as the change of temperature, but the change of the former is later than that of the latter. There is a significant positive correlation between the CO2 concentration of dunes and atmospheric temperature, and temperature is the main factor determining the changing law of the dune CO2 concentration. In addition, the diurnal concentration of CO2 can be changed due to the difference in soil conditions, such as soil moisture, light and wind speed. So, it is of great significance to conduct research into the cause of global warming and the impacts of destruction of vegetation on atmospheric CO2, which can help to find out the changing law of dune CO2 concentration in 24 hours.
ZHAO Jingbo, SHAO Tianjie, YU Keke, LI Enju, CHENG Aifang, MENG Jingjing, DONG Zhibao . Study on the Change of Dune CO2 Concentration in Summer at Minqin in Tengger Desert[J]. PROGRESS IN GEOGRAPHY, 2010 , 29(11) : 1368 -1374 . DOI: 10.11820/dlkxjz.2010.11.024
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