Nitrogen wet deposition is naturally composed from natural and fertilizer/industrial compounds. We focused on estimations of feedbacks between nitrogen wet deposition (NWD) and the N uptake by floodplain tree species that depend on optimal available nitrogen supply. We estimated The tree wood N uptake from the tree­ring analysis re­calculated to the obtained N content in the dry mass. These datasets we compared using 1km grid GIS map algebra over an forested area of the north­east Czech Republic (Central Europe; 6,247 km2; forest cover 21.39%). Present Common ash (Fraxinus excelsior) utilizate about 58.5 t/km2 per year. Willow stands (Salix sp.) utilizate 24.3 t/km2 per year. Potential presented ahs­woods on an optimalized area of 2,375 km2 could utilizate upto 1,389 kt per decade while potential willow­woods on 1,177 km2 upto 285.9 kt per decade. 3.3 t/km2 of N per year could fall on ash and/or willow stands. Willows seem to be able to decrease the pressumed N pollution impacts effectivelly for short­time period while ash­woods for long­time period. However, the tree species pollution buffer­potential is limited due to the over­coming of predicted above­limit levels of the NWD. A pollution decrease is necessary to continuance in providing of the woods buffer effects.

Proceedings of the 18th European Biomass Conference and Exhibition, 3-7 May 2010, Lyon, France, pp. 2269-2274