Wednesday, August 4, 2010 - 10:50 AM

COS 45-9: Turbulent carbon dioxide exchange between an old-growth subtropical forest and the atmosphere

Zhenghong Tan and Yiping Zhang. Xishuangbanna tropical botanical garden, Chinese Academy of Sciences

Background/Question/Methods The subtropical area of China lacks the subtropical dry belt due to the influence of the Tibet Plateau. Primary subtropical evergreen broadleaved forest widely spread in areas where were protected well in the past years. Turbulent exchange between a primary subtropical evergreen broadleaved forest and the atmosphere with four specific objectives (1, to provide an experimental evidence that atmospheric turbulence theories (especially K41 and MOST) was available in air above forest canopy; 2, to investigate the suitability of using eddy covariance in site-specific flux measurement; 3, to make a comparison between leaf-level and stand-level eco-physiology; 4, to determine the ecosystem carbon budget in our investigation interval) were investigated using the eddy covariance technique.

Results/Conclusions

The result shows that: the Kolmogorov law (K41) and Monin-Obukhov similarity theory (MOST) was available in airspace above our studied forest canopy. Higher energy balance closure (87%), well developed turbulence, and well protected same type of evergreen broadleaved forest covered in the eddy flux footprint suggested that this site is suitable for eddy flux measurements. Canopy photosynthesis, which shows some emergent and new properties from level photosynthesis, was control by different environmental factors at different time scale. A very large carbon sink which suggested mirror a recent drought disturbance was obtained in the investigation interval.


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