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Science 25 January 2008:
Vol. 319. no. 5862, pp. 456 - 458
DOI: 10.1126/science.1151382
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Reports

Irreconcilable Differences: Fine-Root Life Spans and Soil Carbon Persistence

Allan E. Strand,1 Seth G. Pritchard,1* M. Luke McCormack,2 Micheal A. Davis,3 Ram Oren4

The residence time of fine-root carbon in soil is one of the least understood aspects of the global carbon cycle, and fine-root dynamics are one of the least understood aspects of plant function. Most recent studies of these belowground dynamics have used one of two methodological strategies. In one approach, based on analysis of carbon isotopes, the persistence of carbon is inferred; in the other, based on direct observations of roots with cameras, the longevity of individual roots is measured. We show that the contribution of fine roots to the global carbon cycle has been overstated because observations of root lifetimes systematically overestimate the turnover of fine-root biomass. On the other hand, isotopic techniques systematically underestimate the turnover of individual roots. These differences, by virtue of the separate processes or pools measured, are irreconcilable.

1 Department of Biology, College of Charleston, Charleston, SC 29424, USA.
2 Huck Institutes of Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA.
3 Department of Biology, University of Southern Mississippi, Hattiesburg, MS 39406–5018, USA.
4 Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA.

* To whom correspondence should be addressed. E-mail: pritchards{at}cofc.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Changes in Forest Soil Carbon and Nitrogen after a Thirty-Year Interval.
L. C. Kiser, J. M. Kelly, and P. A. Mays (2009)
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Dynamics of Fine Root, Fungal Rhizomorphs, and Soil Respiration in a Mixed Temperate Forest: Integrating Sensors and Observations.
R. Vargas and M. F. Allen (2008)
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