Balanço hídrico em área de pastagem no semiárido pernambucano
Propôs, neste trabalho, avaliar a distribuição e a interação entre os componentes do balanço hídrico em uma área de pastagem cultivada em Serra Talhada, no semiárido pernambucano. Foram realizados monitoramentos da precipitação pluvial (P), da variação no armazenamento de água (ΔA) e do escoamento s...
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Published in | Revista brasileira de engenharia agrícola e ambiental Vol. 19; no. 5; pp. 449 - 455 |
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Language | English |
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01.05.2015
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Abstract | Propôs, neste trabalho, avaliar a distribuição e a interação entre os componentes do balanço hídrico em uma área de pastagem cultivada em Serra Talhada, no semiárido pernambucano. Foram realizados monitoramentos da precipitação pluvial (P), da variação no armazenamento de água (ΔA) e do escoamento superficial (ES) para determinação do balanço hídrico. A evapotranspiração (ET) foi obtida a partir da covariância dos vórtices turbulentos. O fluxo total de água no solo (Q), ou seja, a drenagem (-Q) ou ascensão capilar (+Q) foi obtido a partir da equação do balanço hídrico. A taxa de ET da pastagem foi baixa; ainda assim, foi o principal componente de saída de água do sistema seguido pelo ES que, juntos, totalizaram aproximadamente 80% da precipitação pluvial. Esta pesquisa demonstrou que mesmo em anos de seca é necessário se quantificar o ES e as perdas e/ou ganhos de água no limite inferior do solo para se ter uma avaliação precisa da dinâmica da água no sistema solo-pastagem em condições de semiárido.
This study aimed to evaluate the distribution and the interaction between the components of the water balance in pasture area cultivated in Serra Talhada, in the semi-arid region of Pernambuco. Precipitation (P), the variation in water storage (ΔWS) and runoff (R) were monitored for determination of water balance. The evapotranspiration (ET) was obtained from the Eddy covariance method. The total flow of water in the soil (Q), i.e. the drainage (-Q) and raising damp (+Q) was obtained from the equation of water balance. The rate of evapotranspiration of pasture was low, yet this was the main system of water output component, followed by runoff, which together totaled approximately 80% of precipitation. This research demonstrated that, even in years of drought it is necessary to quantify the runoff and losses and/or water gains at lower limit of the soil to get accurate assessment of the dynamics of water in soil-pasture system in semi-arid conditions. |
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AbstractList | Propôs, neste trabalho, avaliar a distribuição e a interação entre os componentes do balanço hídrico em uma área de pastagem cultivada em Serra Talhada, no semiárido pernambucano. Foram realizados monitoramentos da precipitação pluvial (P), da variação no armazenamento de água (ΔA) e do escoamento superficial (ES) para determinação do balanço hídrico. A evapotranspiração (ET) foi obtida a partir da covariância dos vórtices turbulentos. O fluxo total de água no solo (Q), ou seja, a drenagem (-Q) ou ascensão capilar (+Q) foi obtido a partir da equação do balanço hídrico. A taxa de ET da pastagem foi baixa; ainda assim, foi o principal componente de saída de água do sistema seguido pelo ES que, juntos, totalizaram aproximadamente 80% da precipitação pluvial. Esta pesquisa demonstrou que mesmo em anos de seca é necessário se quantificar o ES e as perdas e/ou ganhos de água no limite inferior do solo para se ter uma avaliação precisa da dinâmica da água no sistema solo-pastagem em condições de semiárido.
This study aimed to evaluate the distribution and the interaction between the components of the water balance in pasture area cultivated in Serra Talhada, in the semi-arid region of Pernambuco. Precipitation (P), the variation in water storage (ΔWS) and runoff (R) were monitored for determination of water balance. The evapotranspiration (ET) was obtained from the Eddy covariance method. The total flow of water in the soil (Q), i.e. the drainage (-Q) and raising damp (+Q) was obtained from the equation of water balance. The rate of evapotranspiration of pasture was low, yet this was the main system of water output component, followed by runoff, which together totaled approximately 80% of precipitation. This research demonstrated that, even in years of drought it is necessary to quantify the runoff and losses and/or water gains at lower limit of the soil to get accurate assessment of the dynamics of water in soil-pasture system in semi-arid conditions. |
Author | Antonino, Antonio C. D. Souza, Rodolfo M. S. Lima, José R. de S. Souza, Eduardo S. de |
Author_xml | – sequence: 1 givenname: Rodolfo M. S. surname: Souza fullname: Souza, Rodolfo M. S. organization: Universidade Federal Rural de Pernambuco, Brasil – sequence: 2 givenname: Eduardo S. de surname: Souza fullname: Souza, Eduardo S. de organization: Universidade Federal Rural de Pernambuco, Brasil – sequence: 3 givenname: Antonio C. D. surname: Antonino fullname: Antonino, Antonio C. D. organization: Universidade Federal de Pernambuco, Brasil – sequence: 4 givenname: José R. de S. surname: Lima fullname: Lima, José R. de S. organization: Universidade Federal Rural de Pernambuco, Brasil |
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