Shao Tian-Jie, Zhao Jing-Bo, Yu Ke-Ke, Dong Zhi-Bao
College of Tourism and Environment Science, Shaanxi Normal University, Xi'an 710062, China.
Huan Jing Ke Xue. 2010 Dec;31(12):3004-10.
In order to find out the CO2 concentration of the desert area, the influence of it on the CO2 in the atmosphere and the role that it played on the global carbon cycle, the research team utilized in September 2009 infrared CO2 monitor to observe the CO2 concentration of the 12 drill holes day and night in Minqin desert area in the Tengger desert. The difference of various observation spots' CO2 concentration of the desert area in the Tengger desert area is relatively big. The CO2 concentration at night is low but high in the daytime and the CO2 concentration at each observation spot changes from 310 x 10(-6) to 2 630 x 10(-6). The CO2 concentration is also obviously different in depth and the CO2 concentration at different depths in order of size is as follows: 4 m(3m) > 2 m > 1m. Compared with Xi' an area where is in the temperate and semi-humid region, the CO2 concentration of the desert area in Tengger desert is very low. The diurnal variation of CO2 concentration of the desert area in Tengger desert is obvious, and from the day 09:00 am to 09:00 am the next day, the CO2 concentrations at different depths which rang from 1 m to 4 m present the regularity that it changes from low to high, and then from high to low. The diurnal variation in temperature is the main reason that causes the change of the CO2 concentration in the sand layer, both of which have the positive correlation. The sand layer's CO2 concentration with higher water content is obviously higher than that with lower water content. The moisture content of sand layer is the main factor of the CO2 concentration. The CO2 concentration above 4m in the desert area is higher than that above the surface, which maybe indicates that the CO2 from the highest desert area is also the resource of CO2 in the atmosphere.
为了探明沙漠地区的二氧化碳浓度、其对大气中二氧化碳的影响以及在全球碳循环中所起的作用，研究团队于2009年9月利用红外二氧化碳监测仪对腾格里沙漠民勤沙漠地区的12个钻孔昼夜进行二氧化碳浓度观测。腾格里沙漠地区各观测点的沙漠二氧化碳浓度差异较大。夜间二氧化碳浓度低，白天则高，各观测点的二氧化碳浓度在310×10⁻⁶至2630×10⁻⁶之间变化。不同深度的二氧化碳浓度也存在明显差异，不同深度二氧化碳浓度从大到小依次为：4米（3米）＞2米＞1米。与温带半湿润地区的西安地区相比，腾格里沙漠地区的沙漠二氧化碳浓度非常低。腾格里沙漠地区沙漠二氧化碳浓度的日变化明显，从当天上午09:00至次日上午09:00，1米至4米不同深度的二氧化碳浓度呈现出由低到高再由高到低的变化规律。温度的日变化是导致沙层中二氧化碳浓度变化的主要原因，二者呈正相关。含水量较高的沙层的二氧化碳浓度明显高于含水量较低的沙层。沙层的含水量是影响二氧化碳浓度的主要因素。沙漠地区4米以上的二氧化碳浓度高于地表以上，这可能表明来自沙漠高处的二氧化碳也是大气中二氧化碳的来源。
