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Influência entre relação de radiação fotossinteticamente ativa e radiação global na produtividade primária bruta para Santa Rita do Passa Quatro - SP

2018; UNIVERSIDADE FEDERAL DE SANTA MARIA; Volume: 40; Linguagem: Inglês

10.5902/2179460x30636

2179-460X

Celina Rodrigues, Maria do Rosário Alves Patriota, Bernardo Barbosa da Silva, André Bezerra Oliveira,

Geography and Environmental Studies

This work aims to establish a relationship between the photosynthetically active radiation (PAR) and the global radiation (Rg) for Santa Rita do Passa Quatro (SP), during the period from February 2005 to February 2006 and evaluate its impact on gross primary production (GPP). Data of Rg (Wm-2) and PAR (μmols s-1m-2) were obtained from the mirometeorological tower located in Gleba Cerrado Giant Foot. Data analysis allowed the establishment of a linear equation to express the relationship between PAR (MJ m-2) and Rg (MJ m-2) as: PAR = 0.3787 Rg or PAR = 1.742 Rg, for PAR (μmols s-1m-2) and Rg (MJ m-2). This relationship is indicated for the GPP determination when there is no PAR measurements.