Drivers of site productivity for oak in Poland

The site index (SI) is the most commonly used and representative measure of phytocentric approach; it evaluates productivity based on stand height age. In case mixed stands with complex structures, methods are very limited, while in non-forest areas, they not ap­plicable. situations where applicability de­termined by geocentric methods. Geocentric allow direct modelling productivity, expressed SI predicted from various environmental variables. aim this study was to develop a model for oak. Site described variables characteristics. To model, we data 2490 NFI plots dominant oak species (Quercus sessilis Quercus robur). A generalized additive productivity. We documented significant relationship between variables, age density. Furthermore, shaped climate factors, soil type, geology, altitude. developed method, explained 55.1% variation