流动沙丘不同深度CO_2浓度差异研究  

The Difference of CO_2 Concentration with Different Depth of the Moving Dune

作　　者：邵天杰[1] 赵景波[1,2] 董治宝[1,3] 

机构地区：[1]陕西师范大学旅游与环境学院,陕西西安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,陕西西安710075 [3]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《土壤通报》2011年第2期461-466,共6页Chinese Journal of Soil Science

基　　金：教育部长江学者特聘教授基金项目(801813)

摘　　要：利用红外CO2分析仪对民勤流动沙丘不同深度CO2浓度变化特征进行了昼夜连续观测,同时结合同步温度资料,分析了不同深度沙丘CO2浓度变化特征,得出了1 m、2 m和4 m深度处的CO2浓度累积值依次增大;在1~4 m深度范围内,流动沙丘CO2浓度和大气温度之间呈显著的线性正相关;流动沙丘CO2浓度白天高于夜间,这种变化与昼夜温度变化规律相一致,但由于沙丘厚度大,深层温度的升降相对于大气温度的升降具有滞后性,导致了两者具有不同步变化的现象。大气温度是决定流动沙丘CO2昼夜浓度变化规律的主要因素。此外,沙丘中有机碳含量,沙丘疏松状况、沙丘含水量等都会对CO2昼夜浓度变化有一定的影响。查明沙丘CO2浓度昼夜变化规律对研究全球变暖的原因以及植被破坏对大气中CO2的影响有重要的科学意义。the diurnal changes of dune CO2 concentration under different depths were measured by using of the infrared monitoring instrument and combined with simultaneous temperature data in minqin county.The results showed that the CO2 concentration of 2 m and 4 m depths was always greater than 1 m.There was a significant positive correlation between the CO2 concentration of moving dune and atmospheric temperature in the depth from 1m to 4m.The CO2 cumulative concentration was greater in daytime than in nighttime,which was basically the change of temperature,but the change of the former was later than that of the latter,and led to the asynchronous changes between the CO2 concentration of moving dune and atmospheric temperature.The atmospheric temperature was the main factor of determining the change law of the dune CO2 concentration.In addition,the diurnal concentration of CO2 could be changed by the content of organic carbon,soil conditions,moisture,etc.So it has important scientific significance to research the reason of global warming and the destruction of vegetation on the impact of atmospheric CO2.

关 键 词：流动沙丘 CO2浓度 不同深度 影响因素 昼夜变化规律 

分 类 号：P941.73[天文地球—自然地理学]