腾格里沙漠民勤实验点夏季沙丘CO_2浓度变化  

Study on the Change of Dune CO_2 Concentration in Summer at Minqin in Tengger Desert

作　　者：赵景波[1,2] 邵天杰[1] 郁科科[1] 李恩菊[1] 成爱芳[1] 孟静静[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：《地理科学进展》2010年第11期1368-1374,共7页Progress in Geography

基　　金：教育部"长江学者"特聘教授项目(801813)

摘　　要：为查明腾格里沙漠沙丘CO2浓度和昼夜变化规律,利用红外CO2监测仪在2009年夏季对腾格里沙漠西南部的民勤沙丘CO2浓度变化进行了昼夜连续观测,研究了不同类型、不同深度沙丘CO2浓度变化。研究得出:所有实验点CO2浓度在深度上的变化与通常观测的不同,2m和4m处的CO2浓度都比1m处的大;固定沙丘的昼夜CO2浓度累积值大于半固定沙丘的昼夜CO2浓度累积值,而半固定沙丘的昼夜CO2浓度累积值又大于流动沙丘的昼夜CO2浓度累积值;沙丘白天CO2浓度累积值高于夜间;在极端干旱的腾格里沙漠西南部,不论是固定沙丘、半固定沙丘还是流动沙丘,CO2浓度在一昼夜内也具有清楚的变化规律,即从当日09:00左右到次日09:00点左右均呈现由低到高再到低的变化,但CO2浓度升降相对于大气温度的升降具有一定的滞后性,滞后时间约1～3h;沙丘CO2浓度和大气温度之间存在显著的正相关关系,温度是决定CO2昼夜浓度变化规律的主要因素。在极端干旱的民勤沙漠区,各类沙丘沙层中的CO2浓度都明显高于空气CO2浓度。We have measured the diurnal changes of dune CO 2 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 CO 2 concentration of-2 m and-4 m always greater than that of-1 m.The diurnal CO 2 cumulative concentration from this research can be ranked as fixed dunessemi-fixed dunemov-ing dune.The CO 2 cumulative concentration is greater at daytime than at nighttime.For fixed,semi-fixed and moving sand dunes,the CO 2 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 CO 2 concentration of dunes and atmospheric temperature,and temperature is the main factor determining the changing law of the dune CO 2 concentration.In addition,the diurnal concentration of CO 2 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 CO 2 ,which can help to find out the changing law of dune CO 2 concentration in 24 hours.

关 键 词：腾格里沙漠 沙丘CO2浓度 昼夜变化规律 CO2深度变化 CO2释放 影响因素 

分 类 号：P402[天文地球—大气物理学与大气环境]