WATANABE Tsutomu, NAKAI Yuichiro, KITAMURA Kenzo, UTSUGI Hajime, TOBITA Hiroyuki, ISHIZUKA Shigehiro
Scaling energy and CO2 fluxes from leaf to canopy using a Multilayered Implementation for Natural Canopy-Environment Relations (MINCER)
CO2, energy, flux, multilayer model, scale up
As a tool for compiling individual leaf-scale measurements into a comprehensive representation of canopy-scale fluxes, we developed a stand microclimate model named Multilayered Implementation for Natural Canopy-Environment Relations (MINCER). This model includes all essential processes that affect the fluxes above a plant canopy, that is, biophysical, hydrological and physiological processes functioning differently at various levels inside the canopy. Testing of the model against flux data gathered in a broadleaf deciduous forest in northern Japan indicated the robustness of the model's basic framework for scaling leaf-scale exchanges into canopy-scale fluxes, for both daily and annual time scales. Although there were some cases when the model could not reproduce the measured fluxes consistently, the measured data, rather than the modelled results, were generally found to be problematic in such cases. Because of its mechanistic nature, the model is a reliable tool for gap filling of measured flux data and for investigations of the mechanistic background of long-term and inter-site variations in fluxes.