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Title: Distribution of aboveground live biomass in the Amazon basin
Authors: Saatchi, S. S.
Houghton, R. A.
Dos Santos Alvala, R. C.
Soares, J. V.
Yu, Y.
Keywords: Amazon
remote sensing
Issue Date: Apr-2007
Publisher: Blackwell Publishing
Citation: Global Change Biology, Volume 13, Number 4, April 2007, pp. 816-837
Abstract: The amount and spatial distribution of forest biomass in the Amazon basin is a major source of uncertainty in estimating the flux of carbon released from land-cover and landuse change. Direct measurements of aboveground live biomass (AGLB) are limited to small areas of forest inventory plots and site-specific allometric equations that cannot be readily generalized for the entire basin. Furthermore, there is no spaceborne remote sensing instrument that can measure tropical forest biomass directly. To determine the spatial distribution of forest biomass of the Amazon basin, we report a method based on remote sensing metrics representing various forest structural parameters and environmental variables, and more than 500 plot measurements of forest biomass distributed over the basin. A decision tree approach was used to develop the spatial distribution of AGLB for seven distinct biomass classes of lowland old-growth forests with more than 80% accuracy. AGLB for other vegetation types, such as the woody and herbaceous savanna and secondary forests, was directly estimated with a regression based on satellite data. Results show that AGLB is highest in Central Amazonia and in regions to the east and north, including the Guyanas. Biomass is generally above 300Mghaˉ¹ here except in areas of intense logging or open floodplains. In Western Amazonia, from the lowlands of Peru, Ecuador, and Colombia to the Andean mountains, biomass ranges from 150 to 300Mghaˉ¹. Most transitional and seasonal forests at the southern and northwestern edges of the basin have biomass ranging from 100 to 200Mghaˉ¹. The AGLB distribution has a significant correlation with the length of the dry season. We estimate that the total carbon in forest biomass of the Amazon basin, including the dead and belowground biomass, is 86 PgC with ± 20% uncertainty.
Appears in Collections:JPL TRS 1992+

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