Journal Article

Prediction of <i>in situ</i> root decomposition rates in an interspecific context from chemical and morphological traits

Maurice Aulen, Bill Shipley and Robert Bradley

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 109, issue 1, pages 287-297
Published in print January 2012 | ISSN: 0305-7364
Published online October 2011 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcr259
Prediction of in situ root decomposition rates in an interspecific context from chemical and morphological traits

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background and Aims

We quantitatively relate in situ root decomposition rates of a wide range of trees and herbs used in agroforestry to root chemical and morphological traits in order to better describe carbon fluxes from roots to the soil carbon pool across a diverse group of plant species.

Methods

In situ root decomposition rates were measured over an entire year by an intact core method on ten tree and seven herb species typical of agroforestry systems and were quantified using decay constants (k values) from Olson's single exponential model. Decay constants were related to root chemical (total carbon, nitrogen, soluble carbon, cellulose, hemicellulose, lignin) and morphological (specific root length, specific root length) traits. Traits were measured for both absorbing and non-absorbing roots.

Key Results

From 61 to 77 % of the variation in the different root traits and 63 % of that in root decomposition rates was interspecific. N was positively correlated, but total carbon and lignin were negatively correlated with k values. Initial root traits accounted for 75 % of the variation in interspecific decomposition rates using partial least squares regressions; partial slopes attributed to each trait were consistent with functional ecology expectations.

Conclusions

Easily measured initial root traits can be used to predict rates of root decomposition in soils in an interspecific context.

Keywords: Absorbing root; agroforestry; carbon credits; cellulose; decomposition rate; fibres; hemicellulose; lignin; root diameter; specific root length

Journal Article.  7936 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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