Deciphering the factors controlling the relationship between Ecosystem Functional Properties and sun-induced fluorescence and canopy reflectance in time and under different nutrient conditions using model-data integration approaches. .
Max Planck Institute for Biogeochemistry
The overarching objective of the ESR project is to explore the potential of high temporal resolution hyperspectral information and sun-induced fluorescence to detect changes in ecosystem functioning and their response to environmental conditions under different nutrient availability. The focus will be on the estimation of Ecosystem Functional Properties (EFPs) derived from the eddy covariance flux measurements using empirical or process based models (e.g. Maximum carboxylation capacity – Vcmax, Light Use Efficiency – LUE, maximum stomatal conductance), combined with plant traits and high temporal resolution hyperspectral information.
The study will be conducted for the majority in a tree-grass ecosystem manipulated with nutrients addition (MANIP and SMANIE experiments), and using data from the other sites of the Trustee consortium.
The specific objectives of the PhD program are:
Definition and extraction of the EFPs from eddy covariance and chambers flux measurements (e.g. Maximum carboxylation capacity – Vcmax, Light Use Efficiency – LUE, maximum stomatal conductance).
Methodologies to directly estimate EFPs from hyperspectral data and sun-induced fluorescence estimates in the different study sites. In this phase the student will use jointly the radiative transfer model SCOPE and inversion techniques (e.g. machine learning ) using a variety of constrains.
Deciphering the causes of variability of the relationship between EFPs and sun-induced fluorescence in space (e.g. nutrient availability) and time (structural changes vs functional traits). Evaluate the use high temporal of sun-induced fluorescence measurements to describe the physiological phenology of evergreen broadleaved forests at the experimental site.
The PhD student will spend a visiting period of at least 3 months at the University of Twente, Faculty of Geo-Information Science and Earth Observation under the Supervision of Prof. Dr Christiaan van der Tol.
The activity will be supervised by Dr. Mirco Migliavacca and Prof. Christiaan Van der Tol.