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This table provides, for each of the 403 species used in our analysis, various documentary information as well as the fitted parameters for the relationship between mass growth rate and the natural log of tree size. The independent variable ln(mass) was divided into bins and a separate line segment was fitted to mass growth rate versus ln(mass) in each bin so that the line segments met at the bin divisions. Mass and growth rate were in megagrams (Mg) and Mg yr-1 respectively. Bin divisions were not assigned a priori but were fitted by the model separately for each species. We fitted models with 1, 2, 3, and 4 bins, and selected the model receiving the most support by Akaike’s Information Criterion for each species....
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Forests are major components of the global carbon cycle, providing substantial feedback to atmospheric greenhouse gas concentrations . Our ability to understand and predict changes in the forest carbon cycle--particularly net primary productivity and carbon storage--increasingly relies on models that represent biological processes across several scales of biological organization, from tree leaves to forest stands. Yet, despite advances in our understanding of productivity at the scales of leaves and stands, no consensus exists about the nature of productivity at the scale of the individual tree , in part because we lack a broad empirical assessment of whether rates of absolute tree mass growth (and thus carbon accumulation)...
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