Water balance in pasture area in semi-arid region of Pernambuco

Revista Brasileira de Engenharia Agrícola e Ambiental

Souza, Rodolfo M. S.¹  Lima, José R. de S.²  Souza, Eduardo S. de¹  Antonino, Antonio C. D.³ 

[1] Universidade Federal Rural de Pernambuco, Serra Talhada, Brasil;Universidade Federal Rural de Pernambuco, Garanhuns, Brasil;Universidade Federal de Pernambuco, Recife, Brasil

关键词: runoff;    evapotranspiration;    drainage;    soil water storageIntroduçãoAs regiões semiáridas compreendem aproximadamente 17;    7% do globo terrestre podendo ainda aumentar em função de alterações no ciclo hidrológico (Rotenberg & Yakir;    2010);   

DOI  :  10.1590/1807-1929/agriambi.v19n5p449-455

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

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.

【 授权许可】

Unknown