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Above ground biomass is not consistently related to wood density in tropical forests

Stegen, James C.; Swenson, Nathan G.; Valencia, Renato; Enquist, Brian J.; Thompson, Jill. 2009 Above ground biomass is not consistently related to wood density in tropical forests. Global Ecology and Biogeography, 18. 617-625. 10.1111/j.1466-8238.2009.00471.x

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Abstract/Summary

Aim It is increasingly accepted that the mean wood density of trees within a forest is tightly coupled to above-ground forest biomass. It is unknown, however, if a positive relationship between forest biomass and mean community wood density is a general phenomenon across forests. Understanding spatial variation in biomass as a function of wood density both within and among forests is important for predicting changes in stored carbon in response to global change, and here we evaluated the generality of a positive biomass–wood density relationship within and among six tropical forests. Location: Costa Rica, Panama, Puerto Rico and Ecuador. Methods:Individual stem data, including diameter at breast height and spatial position, for six forest dynamics plots were merged with an extensive wood density database. Individual stem biomass values were calculated from these data using published statistical models. Total above ground biomass, total basal area and mean community wood density were also quantified across a range of subcommunity plot sizes within each forest. Results: Among forests, biomass did not vary with mean community wood density. The relationship between subcommunity biomass and mean wood density within a forest varied from negative to null to positive depending on the size of subcommunities and forest identity. The direction of correlation was determined by the associated total basal area–mean wood density correlation, the slope of which increased strongly with whole forest mean wood density. Main conclusions: There is no general relationship between forest biomass and wood density, and in some forests, stored carbon is highest where wood density is lowest. Our results suggest that declining wood density, due to global change, will result in decreased or increased stored carbon in forests with high or low mean wood density, respectively.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1466-8238.2009.00471.x
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity
CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 2 - Ecological Processes in the Environment
CEH Sections: Watt
ISSN: 1466-822X
Additional Keywords: global change, carbon storage, carbon cycle, nitrogen deposition, lianas, fragmentation, atmosphere-biosphere feedbacks, tropical forests, functional traits, forest dynamics plots.
NORA Subject Terms: Ecology and Environment
Date made live: 06 Jul 2010 14:27
URI: http://nora.nerc.ac.uk/id/eprint/9652

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