Abstract. An analysis of landscape chanizes in a region of pioneer settlements in central Rondônia, western Brazilian Amazon, was derived from Landsat TM data. Total deforested area increased from 206 x 10 3 ha in 1977, to 565 x 103 ha in 1985 and to 1210 x 10 3 ha, or 35.5% of the region, in 1995. Eighty-one per cent of the total 1995 deforestation had occurred in regions within 12.5 km from arcas of pioneer colonization deforested by 1977. Deforested area exceeded 79% in regions within 12.5 km from the region's first road.
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