Tracing the sources of gaseous components (222Rn, CO2 and its carbon isotopes) in soil air under a cool-deciduous stand in Sapporo, Japan.
Radon ((222)Rn) and carbon dioxide were monitored simultaneously in soil air under a cool-temperate deciduous stand on the campus of Hokkaido University, Sapporo, Japan. Both (222)Rn and CO(2) concentrations in soil air varied with atmospheric (soil) temperature in three seasons, except for winter when the temperature in soil air remained constant at 2-3 degrees C at depth of 80 cm. In winter, the gaseous components were influenced by low-pressure region passing through the observation site when the ground surface was covered with snow of ~1 m thickness. Carbon isotopic analyses of CO(2) suggested that CO(2) in soil air may result from mixing of atmospheric air and soil components of different origins, i.e. CO(2) from contemporary soil organic matter and old carbon from deeper source, to varying degrees, depending on seasonal meteorological and thus biological conditions.
Fujiyoshi
Ryoko
R
Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan. fuji@eng.hokudai.ac.jp
Haraki
Yukihide
Y
Sumiyoshi
Takashi
T
Amano
Hikaru
H
Kobal
Ivan
I
Vaupotic
Janja
J
D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere / Q000737:chemistry; D002245:Carbon Dioxide / Q000032:analysis*; D002247:Carbon Isotopes / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D007564:Japan; D007700:Kinetics; D011312:Pressure; D011886:Radon / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D014197:Trees
D000393:Air Pollutants; D002247:Carbon Isotopes; D012987:Soil; D012989:Soil Pollutants; D002245:Carbon Dioxide; D011886:Radon