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Dynamics of the Water Table in Pasture Area and Transitional Forest Amazonia Cerrado in Brazil

Nara Luísa Reis de Andrade, Universidade Federal de Mato Grosso, (Presenting)
Luciana Sanches, Universidade Federal de Mato Grosso,
Osvaldo Borges Pinto Júnior, Universidade Federal de Mato Grosso,
Joăo Areis Ferreira Barbosa Júnior, Universidade Federal de Mato Grosso,
José de Souza Nogueira, Universidade Federal de Mato Grosso,

In last two decades, in the Amazonia South, the conversion of native vegetation has been a constant by crops or pastures, changing the regional hydrologic cycle with effects also in the underground water resources. The present work is evaluate the recharge time and the water deficit in the water table dynamics in transitional forest Amazonia Cerrado and pasture area in Brazil (11ş24.75’S; 55°19.50’O). The climate present dry and wet seasonal water characteristic with seasons defined. 6 water table monitoring wells had been installed under forest and under pasture in the radio of 30 km, where they had been carried through measured monthly of the water level (October/2004 to August/2005). The water level variety seasonality in both ecosystems, presenting minor level in months of dry-wet transitional season in forest (-3.38m, August) and pasture (-3.53m, October), respectively. Larger water deficit in forest and pasture area occurred, respectively, 5 and 7 months after finished precipitation, while the forest presents minor period of recharge. The differences of water deficit and recharge time between the study areas are attributed to fact of the pasture area, presents bigger sun incidence, bigger superficial temperature and consequently bigger lost of water for evaporation than forest, apart from the pasture presents a soil with minor capacity of infiltration than forest, were has bigger biologic activity, soil more porously and more depth roots, favors the water penetration in the soil. Studies of underground waters contribute with the understanding of the hydrological characteristics that are intrinsically attached with the vegetation.

Science Theme:  LC (Land Use and Land Cover Change)

Presentation Type:  Poster

Abstract ID: 57

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