Estudo fÃsico-hÃdrico em lisÃmetros e comparaÃÃo de elementos climÃticos na regiÃo de Lavras - MG / Physical-hydric study in lisymeters and comparison between climatic elements at the region of Lavras, MG,
AUTOR(ES)
Ciro Augusto de Souza MagalhÃes
DATA DE PUBLICAÇÃO
2008
RESUMO
This work aimed to compare data obtained from conventional (EMC) and automatic (EMA) meteorological stations, and to compare different methods against the standard method for estimating the reference evapotranspiration (ETo), for the region of Lavras, Minas Gerais, Brazil. The EMC data, between 2005 and 2008, were obtained from National Institute of Meteorology (INMET) and the EMA data, for the same period, were obtained from a device that was installed in the same place as the EMC. The lowest discrepancies between EMC and EMA were related to temperature and relative humidity. Atmospheric pressure and precipitation showed little dispersion, requiring some adjustments. Solar radiation was the most discrepant parameter between the two measurement systems. The ETo that was estimated from EMA data did not differ from ETo that was estimated from EMC. The method that most closely approximated the standard method, for estimating ETo, was the Makkink method, followed by the Hargreaves-Samani, the Class A tank, and the Budyko method. It was also determined the water balance in lysimeters containing undisturbed samples of Oxisol (LVdf) and Ultisol (PVAd), which are representative of the region of Lavras, MG; these columns were covered with Paspalum notatum Flugge. Meteorological data were obtained using an automatic weather station. Moisture sensors were installed at every 25 cm in the soil columns, in order to monitor changes of water storage in soil over time; evapotranspiration from the columns was compared to the reference evapotranspiration (ETo). The columns containing LVdf presented higher evapotranspiration; these values were close ETo, for the wet periods. Deep drainage was higher in the columns of PVAd, reflecting lower evapotranspiration. Under the lysimeter conditions, the saturated hydraulic conductivity did not represented the drainage potential of PVAd. The moisture at the field capacity was a good indicator of the final of deep drainage, mainly for the LVdf.
ASSUNTO(S)
ACESSO AO ARTIGO
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