Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18742
Title: The regional variation of aboveground live biomass in old-growth Amazonian forests
Authors: Malhi, Yadvinder Singh
Wood, Daniel
Baker, Timothy R.
Wright, Jim A.
Phillips, Oliver L.
Cochrane, Thomas A.
Meir, Patrick W.
Chave, Jérôme
Almeida, Samuel Miranda
Arroyo, Luzmila P.
Higuchi, Niro
Killeen, Timothy J.
Laurance, Susan G.W.
Laurance, William F.
Lewis, Simon L.
Monteagudo, Abel Lorenzo
Neill, David A.
Vargas, Percy Núñez
Pitman, Nigel C.A.
Quesada, Carlos Alberto
Salomão, Rafael Paiva
Silva, Jose Natalino Macedo
Lezama, Armando Torres
Terborgh, John W.
Martínez, Rodolfo Vásquez
Vinceti, Barbara
Keywords: Aboveground Biomass
Carbon Cycle
Rainforest
Soil Fertility
Tropical Forest
Amazonia
South America
Issue Date: 2006
metadata.dc.publisher.journal: Global Change Biology
metadata.dc.relation.ispartof: Volume 12, Número 7, Pags. 1107-1138
Abstract: The biomass of tropical forests plays an important role in the global carbon cycle, both as a dynamic reservoir of carbon, and as a source of carbon dioxide to the atmosphere in areas undergoing deforestation. However, the absolute magnitude and environmental determinants of tropical forest biomass are still poorly understood. Here, we present a new synthesis and interpolation of the basal area and aboveground live biomass of old-growth lowland tropical forests across South America, based on data from 227 forest plots, many previously unpublished. Forest biomass was analyzed in terms of two uncorrelated factors: basal area and mean wood density. Basal area is strongly affected by local landscape factors, but is relatively invariant at regional scale in moist tropical forests, and declines significantly at the dry periphery of the forest zone. Mean wood density is inversely correlated with forest dynamics, being lower in the dynamic forests of western Amazonia and high in the slow-growing forests of eastern Amazonia. The combination of these two factors results in biomass being highest in the moderately seasonal, slow growing forests of central Amazonia and the Guyanas (up to 350 Mg dry weight ha-1) and declining to 200-250 Mg dry weight ha-1 at the western, southern and eastern margins. Overall, we estimate the total aboveground live biomass of intact Amazonian rainforests (area 5.76 × 106 km2 in 2000) to be 93±23 Pg C, taking into account lianas and small trees. Including dead biomass and belowground biomass would increase this value by approximately 10% and 21%, respectively, but the spatial variation of these additional terms still needs to be quantified. © 2006 Blackwell Publishing Ltd.
URI: https://repositorio.inpa.gov.br/handle/1/18742
metadata.dc.identifier.doi: 10.1111/j.1365-2486.2006.01120.x
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