Lysimeter soil water balance evaluation for an experiment developed in the Southern Brazilian Atlantic Forest region (pages 2321–2328)

摘要

This study aims at monitoring the behaviour of the rainfall, runoff, drainage, soil water storage, and evapotranspirationnvariables involved in the water balance measured by lysimeter data. The evaluation of the water balance considered differentntime scales, where the components were monitored daily and in 10-day accumulated period intervals. The results demonstratednthat in wet periods the soil water content was greater at a depth of 10 cm, whereas in the dry periods a greater concentrationnwas observed at 70 cm depth. At the depth of 30 cm, the lowest values of soil water content were observed for both wetnand dry periods. The results, obtained through the use of tensiometers and time domain reflectometry installed internally andnexternally to the lysimeter, were very close, which was more noticeable during the periods of lower water loss by the soil.nThe water balance, calculated from the lysimeter data, demonstrated that 70% of the total rainfall was lost by the processnof evapotranspiration. The drainage accounted for 27D5% of the precipitated water, highlighting the fact that this componentnshould not be disregarded in the water balance calculation. Copyright  2011 John Wiley & Sons, Ltd.