Interceptação em uma floresta ripária secundária urbana em Santarém- PA, Amazônia, Brasil

Abstract

The interception of rain by riparian forest trees plays an important role in the urban Amazon ecosystem. It affects all hydrological processes, as well as the spatial and temporal redistribution of moisture. The aim of this study was to evaluate rainfall interception in an area of urban riparian forest at the source of the Irurá stream, Santarém-PA. The monitoring of precipitation in the open area and precipitation in the internal area occurred with the use of Ville de Paris type rain gauges and gutters. Runoff through the trunk was monitored within a 10 m x 10 m plot. During the study period, 2,659.6 mm of rain was accounted for rainfall above the canopy, 89.3% reached the forest floor as internal precipitation and only 0.5% as runoff through the tree trunk. The trees of the urban secondary riparian forest from the source of the Irurá stream intercepted 272 mm, that is, 10.2% of the total precipitation, representing an important role for the hydrology of the area, both because it allows a high volume of water to return to the atmosphere, as by minimizing the increase in urban runoff. In this study it was possible to quantify and qualify the important role of the components for the recharge of groundwater from the urban spring.