Dynamics of profiles and storage of carbon dioxide in broadleaved/Korean forest in Changbai Mountain

Abstract

CO₂ concentrations at different heights in a broadleaved/Korean forest (with a mean height of 26 m) were measured with infrared gas analyzer IRGA (model 2250D, LI-COR Inc. and LI-COR, 820) from Aug. to Oct. of 1999, Apr. to Jul. of 2000, and from Aug. 2002 to Sept. 2003. Based on the collected data, the diurnal and seasonal dynamics of profiles and storage of carbon dioxide in the forest were analyzed. The diurnal CO₂ profiles showed that the vertical distribution of CO₂ concentration were different for daytime and nighttime, and the CO₂ concentration was highest close to forest floor, no matter at daytime and nighttime. The seasonal profiles of CO₂ showed that stratification in the canopy was evident during growth season. CO₂ concentrations at different heights (60 m to 2.5 m) had a little change in March, with a difference of 10 μmol·mol⁻¹, but had a significant change in July, with a difference of 60 μmol·mol⁻¹. In July, there also existed a greater gradient of CO₂ concentrations at canopy (22, 26 and 32 m), with a difference of 8 μmol·mol⁻¹. The calculated total storage (ΔC/Δt) of CO₂ in the air column with height of 40 m beneath eddy covariance instrument was negative, and made a little contribution to NEE.

Keywords

CO₂ concentration / CO₂ profile / CO₂ storage / Broadleaved/Korean pine forest / Vertical distribution / Concentration gradient / S718.55 / A

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