Variação da infiltração devido a alterações de uso do solo: estudo de caso de implantação de floresta em bioma Pampa

• Ano de defesa: 2014
• Autor(a) principal: Avila, Calinca Barão de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; BR; Recursos Florestais e Engenharia Florestal; UFSM; Programa de Pós-Graduação em Engenharia Florestal
• Palavras-chave em Português: Infiltração de água; Usos do solo; Infiltrômetro de anéis concêntricos; Water infiltration; Soil usage; Concentric ring infiltrometer; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL
• Link de acesso: http://repositorio.ufsm.br/handle/1/8749

The present study was conducted with the objective to evaluate the behavior of the process of water infiltration in the soil, in a portion forested with eucalyptus, in a legal reserve and native field with conventional pasturage, in the characteristic zone of Pampa Biome. The investigation occurred in hillsides that presented different uses of the soil in two experimental small watershed, one is a native pasturage area with 21 hectares occupied by cattle breeding, and another with 95 hectares of Eucalyptus silviculture, the last one is a Permanent Preservation Area and Legal Reserve.The small watersheds are located in the city of Rosário do Sul RS, and they have similar characteristics in the soil, precipitation rate and relief. For each soil usage, there were considered two positions (superior and inferior height) in the same hillside to characterize the infiltration in the ground profile. There were performed a total of 48 infiltration test using concentric rings infiltrometers with distinct weather condition, and the trial values modeled from the Horton, Kostiakov and Kostiakov- Lewis equations. There were collected soil samples in each area, with preserved and misshapen structure to obtain the soil physical parameters as density, porosity (macro, micro and total), texture (clay, silt and sand) and the saturated hydraulic conductivity. Among the tested models, the Horton model represented in a satisfactory way the adjustment of the observed infiltration rate. In the three areas of this study, we observed that the relief position influenced the infiltration capacity, and the higher infiltrations rate have occurred in the inferior heights. The component of the Horton If model, corresponding to the basic infiltration can be used as an indicator of the impact of the soil usage on hydrological processes. The forestry area with Eucalyptus silviculture has a infiltration rate significantly higher than the Legal Reserve and the Native Field with Pasturage, respectively. Therefore we can affirm that, in this experiment, we noticed variations in the infiltration capacity due to the alteration in the soil usage.