Articles Secondary Forest Age and Tropical Forest Biomass Estimation Using Thematic Mapper Imagery ROSS F. NELSON, DANIEL S. KIMES, WILLIAM A. SALAS, AND MICHAEL ROUTHIER he Brazilian Legal Amazon encompasses an area SINGLE-YEAR TROPICAL FOREST AGE Tof approximately 5,030,000 km , stretching from the states of Maranhão and Tocantins in the east to Amazonas CLASSES, A SURROGATE FOR STANDING and Acre in the west, and from Roraima and Amapá in the north to Mato Grosso in the south. Approximately BIOMASS, CANNOT BE RELIABLY 2 2 4,090,000 km of this area is forested, 850,000 km is IDENTIFIED USING SINGLE-DATE TM cerrado (wooded grassland), and 90,000 km is water (Skole and Tucker 1993, Fearnside 1996). As of 1988, 230,324 km , IMAGERY or 5.6%, of the approximately 4,090,000 km forested Brazilian Legal Amazon had been deforested (Skole and Tucker 1993, Skole et al. 1994) since theconstruction of the and Skole 1996, Foody et al. 1996, Kimes et al. 1999). Rates Belem-Brasilia Highway in 1958 (Moran et al. 1994). Each of deforestation and afforestation in the Amazon are year, approximately 15,000–20,000 km of additional responsive primarily to political and economic policies— primary tropical forest in this region are cut and cleared federal
BioScience – Oxford University Press
Published: May 1, 2000
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