Applications and prospect of the flux-gradient method in measuring the greenhouse gases and isotope fluxes

doi:10.17521/cjpe.2019.0227

Abstract

Abstract:

Flux-gradient method and eddy covariance technique are classical micrometeorological methods, which observe fluxes of mass and energy. Flux-gradient method can effectively measure the greenhouse gas and isotope fluxes between ecosystem (or soil) and atmosphere although gas analyzer with high measuring frequency was not available or the fetch was small. Flux-gradient method can be viewed as an ancillary measurement and useful complement of eddy covariance technique. This paper reviewed from the following aspects: the fundamental theory, concepts and assumptions of flux-gradient method; the methods measuring the gradient of greenhouse gases and the theory on turbulent diffusion coefficients; the applications of this method in measuring greenhouse gas fluxes, especially on isotope fluxes, over various ecosystems including forest, cropland, grassland, wetland and water bodies. Finally, the considerations and suggestions were provided regarding the measurement on concentration gradients of greenhouse gases and isotopes, and the calculation of turbulent diffusion coefficients.

Key words: flux-gradient method, greenhouse gas flux, isotope flux

ZHAO Jia-Yu, XIAO Wei, ZHANG Mi, WANG Jing-Yuan, WEN Xue-Fa, LEE Xu-Hui. Applications and prospect of the flux-gradient method in measuring the greenhouse gases and isotope fluxes[J]. Chin J Plant Ecol, 2020, 44(4): 305-317.

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https://www.plant-ecology.com/EN/Y2020/V44/I4/305

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