PHYSICAL ATTRIBUTES AND FIELD WATER BALANCE FOR NATIVE OMBROPHYLOUS FOREST, ON AN OXISOL, IN TELEMACO BORBA--PR STATE/ATRIBUTOS FISICOS E BALANCO HIDRICO DO SOLO COM FLORESTA OMBROFILA MISTA, EM LATOSSOLO VERMELHO-AMARELO, EM TELEMACO BORBA--PR

The objective of this study was to characterize the soil physical and hydric attributes and quantify, in one year, the water balance components, carried out for Native Ombrophylous Forest, in an OXISOL, sandy texture, in Telemaco Borba--PR state. The experiment was held at Monte Alegre Farm, which belongs to the company Klabin Florestal, the area was under native forest in an advanced state of regeneration. The following physical and hydric attributes were characterized: bulk density, saturated hydraulic conductivity, soil water retention curve, aeration porosity and total available water (TAW). The undisturbed samples were collected in a trench, in five depths. The disturbed samples were collected weekly, in eight different points inside the experiment area, in five depths. The values of soil moisture and internal precipitation were collected and registered throughout the year. The soil water storage was calculated using the trapezoidal rule. The internal drainage and capillary rise were estimated by using the Darcy-Buckingham equation. The values of the bulk density, micro, macro and total porosity of the soil are classified in the range considered adequate for soils with sandy texture. The soil presented a high hydraulic conductivity, which is a characteristic of well drained soils. In average, the storage did not reach the permanent wilting point throughout the year. The average deep drainage was bigger throughout the months with more precipitation, the value being an average of 94.9 mm [year.sup.-1]. The average value of the real evapotranspiration was 1355.9 mm [year.sup.-1], an average of 3.7 mm [day.sup.-1]. Keywords: native forest; hydric relations; evapotranspiration. Objetivou-se no presente trabalho caracterizar os atributos fisico-hidricos do solo e quantificar, em um ano, as componentes de um balanco hidrico, realizado para Floresta Ombrofila Mista em Latossolo VermelhoAmarelo, textura arenosa, em Telemaco Borba--PR. O experimento foi instalado na Fazenda Monte Alegre, pertencente a empresa Klabin Florestal, em area com mata nativa em estado avancado de regeneracao. Foram caracterizados os seguintes atributos fisicos do solo: massa especifica, condutividade hidraulica saturada, curva de retencao da agua, porosidade de aeracao e capacidade de agua disponivel (CAD). As amostras indeformadas foram coletadas em uma trincheira, em cinco camadas. As amostras deformadas foram retiradas semanalmente, em oito pontos dentro da area experimental, em cin