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标题：TIME LAGS BETWEEN RAINFALL AND GROUNDWATER LEVELS IN A FOREST AND CATTLE PASTURE OF AN AMAZON WATERSHED
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作者：Luciana Sanches ; Nara Luisa Reis de Andrade ; Osvaldo Borges Pinto-J�nior 等
期刊名称：Journal of Environmental Hydrology (ältere Jahrgänge)
印刷版ISSN：1058-3912
电子版ISSN：1996-7918
出版年度：2009
卷号：17
出版社：IAEH
摘要：Time lags between rainfall and groundwater level response are quantified by cross-correlation analysis comparing transitional forest and cattle pasture (Amazonia and Savanna) ecosystems in the north of Mato Grosso State, Brazil. Groundwater levels were measured monthly from January 2005 to December 2006 in six monitoring wells. Micrometeorological data (air temperature, relative humidity and rainfall) were collected for the same period. Groundwater level increased in the wet season and decreased in the dry season in both ecosystems. The maximum correlation coefficient between rainfall and water level for the forest occurred after a time lag of 2 months in the forest and 1 month in the pasture. The conclusion is that the forest had larger time lag (and smaller amplitude) than the pasture due to the forest having greater evapotranspiration, less average soil moisture, and consequently, lower average level of water table compared to pasture if the soil conditions are similar.