Radial gradients in wood specific gravity in trees of Central Amazonian 
floodplains

Parolin, Pia

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Radial gradients in wood specific gravity in trees of Central Amazonian floodplains

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Parolin, Pia
Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Parolin, P. (2002). Radial gradients in wood specific gravity in trees of Central Amazonian floodplains. IAWA Journal, 23(4), 449-457.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-DDA2-8

Abstract

Increases in wood specific gravity (SG) with distance from pith are associated with the growth strategies of trees and their environments. In the present study, radial gradients in SG were analysed for 20 species from nutrient-rich whitewater floodplains (varzea), including seven pioneer species, and for 15 species from nutrient-poor blackwater floodplains (igapo) in Central Amazonia. Average SG increased from pith to bark by 12% in the species from igapo, compared to 16% in the non-pioneers and 35% in the pioneers from varzea. The increases lie in the range of tropical dry forests. SG variation follows the growth strategies of the trees, The main trend in nutrient-rich varzea is fast growth, with low SG wood initially and higher increases in SG. In nutrient-poor igapo, the tendency is relatively constant, slow growth and low SG changes throughout tree life.