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Carbon Content of Tree Tissues: A Synthesis
Faculty of Forestry, University of Toronto, Earth Sciences Building, 33 Willcocks Street, Toronto, ON, M5S 3B3, Canada
* Author to whom correspondence should be addressed.
Received: 12 April 2012; in revised form: 24 May 2012 / Accepted: 11 June 2012 / Published: 19 June 2012
Abstract: Assessing the potential for forest carbon (C) capture and storage requires accurate assessments of C in live tree tissues. In the vast majority of local, regional, and global assessments, C content has been assumed to be 50% of tree biomass; however, recent studies indicate that this assumption is not accurate, with substantial variation in C content among tree species as well as among tissue types. Here we conduct a comprehensive literature review to present a global synthesis of C content in tissues of live trees. We found a total of 253 species-specific stem wood C content records in 31 studies, and an additional 34 records of species with C content values of other tissues in addition to stem wood. In all biomes, wood C content varied widely across species ranging from 41.9–51.6% in tropical species, 45.7–60.7% in subtropical/Mediterranean species, and 43.4–55.6% in temperate/boreal species. Stem wood C content varied significantly as a function of biome and species type (conifer, angiosperm). Conifer species exhibited greater wood C content than angiosperm species (50.8 ± 0.7% (95% C.I.) and 47.7 ± 0.3%, respectively), a trend that was consistent among all biomes. Although studies have documented differences in C content among plant tissues, interspecific differences in stem wood appear to be of greater importance overall: among species, stem wood C content explained 37, 76, 48, 81, and 63% respectively of the variation in bark, branch, twig, coarse root, and fine root C content values, respectively. In each case, these intraspecific patterns approximated 1:1 linear relationships. Most published stem wood C content values (and all values for other tree tissues) are based on dried wood samples, and so neglect volatile C constituents that constitute on average 1.3–2.5% of total C in live wood. Capturing this volatile C fraction is an important methodological consideration for future studies. Our review, and associated data compilation, provides empirically supported wood C fractions that can be easily incorporated into forest C accounting, and may correct systematic errors of ~1.6–5.8% in forest C assessments.
Keywords: carbon; forest; tree; volatile carbon; wood chemistry; carbon accounting; tropical forest; temperate forest; subtropical forest; boreal forest
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Thomas, S.C.; Martin, A.R. Carbon Content of Tree Tissues: A Synthesis. Forests 2012, 3, 332-352.
Thomas SC, Martin AR. Carbon Content of Tree Tissues: A Synthesis. Forests. 2012; 3(2):332-352.
Thomas, Sean C.; Martin, Adam R. 2012. "Carbon Content of Tree Tissues: A Synthesis." Forests 3, no. 2: 332-352.