土壤学报2011，Vol.48Issue(6)：1158-1165,8.
阿拉善流动沙漠区沙层CO2浓度与昼夜变化规律研究
CO2 CONCENTRATION AND ITS DIURNAL VARIATION IN SAND LAYER OF MOBILE SAND DUNES OF ALXA DESERT
摘要
Abstract
In order to explore CO2 concentration in the sand layer of the mobile sand dunes of the Alxa Desert, and its influence atmospheric CO2 and its role in the global carbon cycling, the research team utilized infrared CO2 monitor to observe diurnal variation of CO2 concentrations in the 19 holes drilled in mobile sand dunes of the desert. Results show that the CO2 concentration in the air was lower than that in the sands 1 m, 2m, 3m, 4m or 5m deep, which indicates that the mobile sand dunes with rare plants release CO2 into the atmosphere both at night and in the daytime during the warm season, acting as CO2 sources. In the sand layer 5 m deep in the profile, the CO2 concentration is markedly higher than that in the air, suggesting that the potential of CO2 release is very big. In the extremely arid part of the Alxa Desert, CO2 concentration is usually higher in the sand layer 2 m deep than in the layers 1 m,3m,4m or 5m deep, but with some individual exceptions. Diurnal variation of CO2 concentration in the area follows a specific law in all the layers, showing a curve of saddle shape from 08 ;00 am to 07:00 am the next day, and a significant positive relationship with the temperature in the profile. In that region, the sand layer higher in moisture content is significantly higher in CO2 concentration, which indicates that moisture content in the sand layers is the major factor determining CO2 concentration in the layer.关键词
CO2浓度/昼夜变化规律/CO2释放/阿拉善/沙漠区Key words
CO2 concentration/ Law of diurnal variation/ CO2 release/ Alxa/ Desert area分类
农业科技引用本文复制引用
赵景波,邵天杰,周旗,马延东,邢闪,郁科科,董治宝..阿拉善流动沙漠区沙层CO2浓度与昼夜变化规律研究[J].土壤学报,2011,48(6):1158-1165,8.基金项目
陕西省灾害监测与模拟重点实验室项目(09JS074)、教育部"长江学者"特聘教授项目(801813)资助 （09JS074）
