Portal de Periódicos da CAPES

Variabilidad climática de los componentes del balance hídrico seriado en el sur de Santa Fe.

2012; Universidad Nacional de Rosario; Issue: 19 Linguagem: Inglês

2250-8872

Alejandra Coronel, Oscar Sacchi, M. Costanzo,

Plant and soil sciences

One of the key aspects to consider in agricultural regions is water availability and serial water balance (BHS) provides an approximation of that. The aim of this work is to analyze the climatic variability of the input parameters of the BHS: precipitation and potential evapotranspiration, and their derivatives: deficit, excess, stored water and real evapotranspiration. The monthly information for the period 1973 to 2007 at the Zavalla agro-meteorological station (33 ° 01´S, 60 ° 53´O) was analyzed and it includes the following variables: precipitation, maximum temperature, minimum temperature, effective insolation, wind speed and relative humidity. The monthly EP is calculated using the FAO Penman-Monteith method and BHS is obtained using the model in which the soil is divided into two layers, one with a higher retention capacity of 25 mm and a deep one with a capacity of 225 mm. The balance showed that the period of the year with the highest deficit frequency corresponds to August-February, the most intense deficits occurring between November and January. On the other hand, the situations of excess can occur throughout the year, but they are more frequent between March and June, the soil recharge period. When considering the atmosphere-soil-plant system, the significant trends of atmospheric input variables are not reflected in the balance output variables in the same magnitude, due to the complexity of the system relationships.