The albedos of shortwave, infrared and photosynthetically active radiations (PAR) were estimated for three ecosystems of the Amazon forest. The research was conducted in the areas of Campina and Campinarana of the Biological Reserve of Campina, located at km 46, on Highway BR-174 which connects Manaus and Caracarai (2º 34'S; 60º 2'W) and in the area of "Mata Densa" in the Ducke Forest Reserve (2º 57'S; 59º 57'W). A metallic tower, with set of sensors for measuring the incident and canopy reflected shortwave, infrared and photosynthetically active radiations was installed over each of the above mentioned canopies. Similar sensors were also installed at the soil surface to measure the cited parameters. Four microloggers were used for acquiring the daily data from 5 h 51 min to 18 h at intervals of one second and the average values for each minute were obtained and stored. The results show that the albedos of the shortwave, infrared and photosynthetically active radiations for the three canopies can be estimated, as a function of the solar elevation angle, with good precision for anytime of the day.
Mata Densa; Campina; Campinarana; reflection
