Availability of energy for sugarcane in the coastal plains of Paraiba state

作者：de Azevedo Pedro V; Saboya Luciano M F^*; Dantas Neto Jose; Oliveira Fabricio da S; Bezerra Jose R C; Farias Carlos H de A

来源：Revista Brasileira de Engenharia Agricola e Ambiental, 2014, 18(10): 1031-1038.

DOI：10.1590/1807-1929/agriambi.v18n10p1031-1038

• albedo
• net energy
• fluxes of latent and sensible heat
• soil heat flux

An experiment was conducted with the sugarcane (Saccharum spp.) variety RB92579, during the period of 2010 to 2011 in Capim, PB, aiming to analyse the components of the radiation and energy balances. The following variables were monitored: incident and reflected solar radiation, net radiation, atmospheric radiation incident to the surface, emitted effective radiation and the albedo of the vegetated surface. The energy balance based on the Bowen ratio was used to determine the latent and air and soil sensible heat fluxes. For the sugarcane maximum growth and maturation phases showed that: a) there were no significant changes in the behavior of the radiation balance components, b) the albedo ranged from 0.17 to 0.27 with an average of 0.23; c) the linear regressions between net radiation and net shortwave radiation showed high levels of correlation; d) the thermal coefficient decreased while the coefficient of transformation into long waves increased with increasing vegetation cover, e) the daily net radiation and the latent and sensible heat fluxes increased from the rainy to the dry seasons; f) 82% of net radiation was used as latent heat, 16% and 2% as sensible heat for heating air and the soil, respectively.

• 出版日期2014-10