Photosynthetic Activity of Phytocenoses and its Relationships with Environmental Parameters in Southern Western Siberia from Reanalysis Data and Satellite Observations

Solar-induced fluorescence is an index of plant photosynthetic activity, promising for monitoring ecosystem productivity on a global scale. In this work we present estimates of photosynthetic activity of the main phytocenoses in the south of Western Siberia (grasslands, deciduous and light coniferous forests, croplands, and wetlands), using TROPOMI satellite data for the period of 2018–2024. Employing ERA5-Land reanalysis data and products, obtained from MODIS and CERES measurements, we studied the correlations between solar-induced fluorescence and the main temperature-moisture environmental parameters, vegetation indices, and photosynthetically active radiation, as well as directly between these characteristics themselves (spatial resolution is 0.05°, and time resolution is 1 month). The presented results describe the specific features of these interrelations both for the main phytocenoses of all target area, and their latitude variations for grasslands and deciduous forests.