Interaction of precipitation with tree canopy increases nutrient input

Given that atmospheric deposition is the first source of nutrient input into forest ecosystems, and precipitation partition serves as a nutritional mainly when there an interaction with canopy, objective present study was to quantify nutrients rainfall, throughfall stemflow in Eucalyptus urophylla stands partial exclusion (E) without (WE) throughfall. The experiment conducted northeast state Paraná-Brazil, municipality Telêmaco Borba. system formed by gutters conduct 30% out experiment. rainfall 55.7 kg ha-1 yr-1, while sum 64.1 yr-1 treatment 39.8 (E). Interaction canopy trees enriched nutrients, elements potassium chlorine, due leaching vegetal tissues. reduction water reduced representative input. Although represents on average only 2.6% volume, it responsible for 6.7% amount relation precipitation. Therefore, cannot be neglected balance cycling. With rotation 7 years, application significant amounts fertilizers can avoided, considering inputs 449 277 ha-1year-1.
 Keywords: cycling, stemflow,