摘要
利用塔克拉玛干沙漠北缘流动沙漠—古河床过渡带肖糖地区2012年6—8月土壤40 cm深处CO2浓度和相关气象要素资料,对该区域的土壤CO2浓度变化特征及影响因子进行了分析.结果表明：（1）肖塘地区夏季土壤40 cm深处CO2浓度的日变化过程中呈现出夜间低、白天高的单峰型,日最高值出现在18：00左右,最低值出现在6：30左右,浓度平均值保持在506.9751-8.14 ppm之间;（2）随着土壤温度和土壤湿度的变大,土壤CO2浓度增大,两者呈显著正相关;（3）风速和土壤CO2浓度之间存在一定的滞后性;（4）大气压力对土壤CO2浓度变化产生显著影响,两者呈负相关.
The characteristics and influence factors of soil CO2 concentration were analyzed by using soil CO2 concentration, soil temperature, soil humidity at a depth of 40 cm, and data of atmospheric pressure and wind speed from Xiaotang region, a transition zone of mobile desert of northern border of Taklimakan desert, from 1 st July to 31 st August, 2015. The results showed that, （1）the daily change of soil CO2 concentration at a depth of 40 cm appeared a single peak curve （lower values at night and high values at day）, the daily maximum value occurred at about 18：00 and the lowest value appeared at about 06：30, the average concentration value varied from 506.97 ppm to 518.14 ppm; （2） soil CO2 concentration increased as the soil temperature rose with a significant positive correlation,（3）the higher soil relative humidity accompanied the higher soil CO2 concentration with a significant positive correlation because the soil CO2 was not easily dispersed under higher relative humidity;（4）atmospheric pressure affected soil CO2 concentration by allowing air into the soil or soil decreased CO2 concentration by atmospheric diffusion, and there were a negative correlation between them.
出处
《沙漠与绿洲气象》
2016年第2期63-69,共7页
Desert and Oasis Meteorology
基金
国家自然科学基金(41175140)
公益性行业专项(GYHY201306066)共同资助
