Turbulent exchange of CO2 was measured continuously via the open-path eddy covariance technique over a broadleaf-Korean pine forest in Changbai Mountain, northeast China. The results show that with near-neutral atmospheric stratification, CO2 and vertical wind components measured over the forest canopy in the inertial sub-range followed the expected -2/3 power law. The dominant vertical eddy scale was about 100 m. The frequency ranges of eddy contributions to CO2 fluxes were mostly within 0.01–2.0 Hz. Large eddies with low frequency over the canopy contributed more to CO2 fluxes than small eddies. The open-path eddy covariance system could satisfy the estimation of turbulent fluxes over the canopy, but the CO2 fluxes between forest and atmosphere were generally underestimated at night because of the increment non-turbulent processes, suggesting that the CO2 fluxes estimated under weak turbulence need to be revised correspondingly.
WU Jiabing, GUAN Dexin, SHI Tingting, HAN Shijie, JIN Changjie, SUN Xiaomin
. Turbulent exchange of CO over a broadleaf-Korean pine forest in Changbai Mountain, northeast
China[J]. Frontiers of Forestry in China, 2008
, 3(4)
: 401
-406
.
DOI: 10.1007/s11461-008-0066-z
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