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Title: Do species traits determine patterns of wood production in Amazonian forests?
Authors: Baker, Timothy R.
Phillips, Oliver L.
Laurance, William F.
Pitman, Nigel C.A.
Almeida, Samuel Miranda
Arroyo, Luzmila P.
Di Fiore, Anthony
Erwin, Terry L.
Higuchi, Niro
Killeen, Timothy J.
Laurance, Susan G.W.
Nascimento, Henrique Eduardo Mendonça
Monteagudo, Abel Lorenzo
Neill, David A.
Silva, Jose Natalino Macedo
Malhi, Yadvinder Singh
Lopez-Gonzalez, Gabriela
Peacock, Julie
Quesada, Carlos Alberto
Lewis, Simon L.
Lloyd, Jon
Keywords: Aboveground Biomass
Carbon Cycle
Environmental Factor
Hypothesis Testing
Species Concept
Tropical Forest
Issue Date: 2009
metadata.dc.publisher.journal: Biogeosciences
metadata.dc.relation.ispartof: Volume 6, Número 2, Pags. 297-307
Abstract: Understanding the relationships between plant traits and ecosystem properties at large spatial scales is important for predicting how compositional change will affect carbon cycling in tropical forests. In this study, we examine the relationships between species wood density, maximum height and above-ground, coarse wood production of trees ≥10 cm diameter (CWP) for 60 Amazonian forest plots. Average species maximum height and wood density are lower in Western than Eastern Amazonia and are negatively correlated with CWP. To test the hypothesis that variation in these traits causes the variation in CWP, we generate plot-level estimates of CWP by resampling the full distribution of tree biomass growth rates whilst maintaining the appropriate tree-diameter and functional-trait distributions for each plot. These estimates are then compared with the observed values. Overall, the estimates do not predict the observed, regional-scale pattern of CWP, suggesting that the variation in communitylevel trait values does not determine variation in coarse wood productivity in Amazonian forests. Instead, the regional gradient in CWP is caused by higher biomass growth rates across all tree types in Western Amazonia. Therefore, the regional gradient in CWP is driven primarily by environmental factors, rather than the particular functional composition of each stand. These results contrast with previous findings for forest biomass, where variation in wood density, associated with variation in species composition, is an important driver of regional-scale patterns in above-ground biomass. Therefore, in tropical forests, above-ground wood productivity may be less sensitive than biomass to compositional change that alters community-level averages of these plant traits. © Author(s) 2009.
metadata.dc.identifier.doi: 10.5194/bg-6-297-2009
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