腾格里沙漠沙坡头区流动沙丘CO_2浓度与变化规律  

Variation of CO_2 concentration of the moving dune in Shapotou area of Tengger desert

作　　者：赵景波[1,2] 孟静静[1] 成爱芳[1] 邵天杰[1] 董治宝[1,3] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710062 [2]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [3]中国科学院寒区旱区环境与工程研究所,兰州730000

出　　处：《地球环境学报》2011年第2期374-380,共7页Journal of Earth Environment

基　　金：教育部长江学者特聘教授基金项目(801813)

摘　　要：为了查明沙漠区流动沙丘CO2浓度昼夜变化规律，利用红外CO2监测仪在2010年5月对腾格里沙漠东南缘的沙坡头区流动沙丘不同深度的CO2浓度变化进行了昼夜连续观测。测定结果表明：在一昼夜内，从早8点到次日早8点，1m、2m、4m深度处CO2浓度与大气温度变化趋势基本一致．均呈现由低到高再到低的变化规律：1m深度处CO2浓度高低时段的变化与大气温度基本同步．而2m、4m深度处CO2浓度的高低时段比大气温度滞后约1～2h；流动沙丘不同深度CO2浓度与温度之间存在显著的正相关关系．空气温度是影响4m以上沙层CO2浓度大小的主要因素：流动沙丘不同深度CO2浓度累积值呈昼高夜低的变化特点，表明沙漠区微生物活动强度白天大于夜间：4m以上沙层CO2浓度均高于距地面1m高处CO2浓度，表明该区可能是CO2的排放源区．In order to find out the variation of CO2 concentration of the moving dune in the desert area, we have measured the continuous change of CO2 concentration of the moving dune at different depths by using the infrared monitoring instrument in Shapotou area which is at the southeast edge of Tengger Desert, The results show that the change of 1 m,2 m, 4 m of CO2 concentration and air temperature is consistent that is from low to high then to low in a circadian day from 8 am. to 8 am. the next day. High and low periods of the 1 m of CO2 concentration is basically synchronized with the air temperature. High and low periods of the 2 m and 4 m of CO2 concentration are about 1 - 2 h later than the air temperature. There is a significant positive correlation between CO2 concentration of the moving dune at different depths and air temperature. Air temperature is the main factor which influences the CO2 concentration above 4 m depth in the sand layer. The cumulative value of the CO2 concentration is higher in daytime and low in nighttime which indicates the microbial actives more intensively at the day than at night in the desert. The CO2 concentration above 4 m is higher than lm high from the ground, which indicates this may be the emission area of CO2.

关 键 词：流动沙丘 不同深度 不同坡向 CO2浓度 昼夜变化规律 沙坡头区 

分 类 号：X16[环境科学与工程—环境科学] P402[天文地球—大气物理学与大气环境]