Ocena warunków siedliskowych oraz bariery rozwoju istniejących drzew na tereniefragmentów dzielnic Praga Północ i Praga Południe

On the area were research was conducted the most important stress factors on checked area were dry soil, not enough oxygen in the soil, soil compaction, salinity, alkaline soil, mechanical damages, pollution of the air. The most damaging for tree condition is accumulation of few factors, for example high temperature, drought and salinity. The most difficult stress conditions were recognised on streets with high traffic; Targowa, Solidarności, Jagiellońska, Kłopotowskiego. Streets with lower traffic have a problem of restricted soil for rooting and not porous pavements. Destroyed soil and water conditions have the biggest impact on deterioration of tree vitality and long life chances. Conducted studies proofed that soil mast be protected. Knowledge of trees reactions helps to take responsible decision concerning urban forest management.