Innovative technologies cross scales to disentangle carbon dioxide and evapotranspiration fluxes of forests – INETFLUX
Coordinating recipient: Ústav výzkumu globální změny AV ČR, v. v. i.
Keywords: Eddy Covariance, Machine learning, Carbon and Water flux partitioning, Stable carbon isotope Isotope/Sap flow technique, Tree rings, Laser ablation, High-resolution automatic dendrometers, Tissue heat balance technique, Airborne remote sensing, forest.
Annotation of project:
The INETFLUX project will connect Czech and Swiss research institutions that are part of ESFRI ICOS ERIC, with the aim of strengthening bilateral cooperation, deepening international integration, and building the capacity of the CzeCOS research infrastructure. The project will focus on research aimed at understanding carbon and water fluxes in different forest ecosystems and how they change under conditions of climate change. The cooperation will focus specifically on the net ecosystem exchange of carbon dioxide (NEE) and evapotranspiration (ET), which are key processes determining the role of forests as carbon sinks and their capacity to modulate the land-surface energy balance through transpiration. Both processes are increasingly affected by droughts, heatwaves, and water stress. The research objective of the project is to develop and validate new approaches for partitioning NEE and ET into their individual components—gross primary production (GPP) and ecosystem respiration, as well as transpiration and evaporation—and to identify the environmental drivers that regulate these processes. This will be achieved by combining advanced methods across spatial scales: isotopic analyses and sap flow measurements at the level of individual trees; eddy covariance observations of energy and matter fluxes at the stand level, analyzed through machine learning approaches (XGB algorithm, SHAP values); and remote sensing techniques with high spatial and spectral resolution. The project targets three contrasting sites (Davos, Bílý Kříž, Lanžhot), representing different climatic conditions and species compositions. This setup enables detailed comparative analyses of forest responses to climate variability and extremes, with a particular focus on drought.




